O uso de tecnologias inovadoras e sustentáveis que primem pelo desenvolvimento de sistemas agrícolas produtivos, como as rizobactérias multifuncionais, são fundamentais para garantir a segurança e qualidade dos alimentos. Diante disso,... more
O uso de tecnologias inovadoras e sustentáveis que primem pelo desenvolvimento de sistemas agrícolas produtivos, como as rizobactérias multifuncionais, são fundamentais para garantir a segurança e qualidade dos alimentos. Diante disso, esse estudo de caráter teórico, realizado por meio de uma pesquisa bibliográfica de caráter exploratório e abordagem qualitativa, teve como objetivo trazer informações referentes às rizobactérias multifuncionais abordando os aspectos gerais, características principais, alguns gêneros de importância agrícola, seus principais mecanismos de ação e a importância da coinoculação. Rizobactérias multifuncionais são bactérias rizosféricas, endofíticas ou simbióticas, que possuem a capacidade de proporcionar melhoria no crescimento das plantas, potencializando o aumento da produtividade. A utilização dessas bactérias nos sistemas agrícolas tem se mostrado uma tecnologia inovadora e sustentável devido aos diferentes mecanismos de ação, que podem ser diretos e i...
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O uso da tecnologia Penergetic tem sido proposta para a obtenção de maiores produtividades das culturas visando maior disponibilidade dos nutrientes do solo, notadamente o fósforo. O objetivo do trabalho foi determinar a produtividade de... more
O uso da tecnologia Penergetic tem sido proposta para a obtenção de maiores produtividades das culturas visando maior disponibilidade dos nutrientes do solo, notadamente o fósforo. O objetivo do trabalho foi determinar a produtividade de grãos e componentes de produção do feijoeiro comum afetados pela adubação fosfatada e pela aplicação de Penergetic. O experimento foi conduzido em condições de campo sob irrigação, por dois anos agrícolas (2012 e 2013). O delineamento experimental foi em blocos casualizados no esquema fatorial 4 x 2. Os tratamentos constaram da combinação de quatro doses de fósforo aplicados ao solo (0, 40, 80 e 120 kg ha-1 de P2O5) com a presença e ausência de aplicação de Penergetic. A adubação fosfatada proporcionou incrementos significativos na produtividade de grãos e componentes de produção do feijoeiro comum nos dois anos de cultivo. O uso de Penergetic independente da dose de fósforo utilizada proporcionou maior produtividade de grãos do que os tratamentos s...
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Inoculating plants with a mix of beneficial microorganisms can significantly improve plant growth and contribute to sustainable agriculture. However, it is unclear if mixed inoculations of microorganisms provide better results than... more
Inoculating plants with a mix of beneficial microorganisms can significantly improve plant growth and contribute to sustainable agriculture. However, it is unclear if mixed inoculations of microorganisms provide better results than inoculations of a single beneficial microorganism. Thus, the objective of this study was to evaluate the effects of beneficial microorganisms on the performance of upland rice in a greenhouse experiment using a completely randomized design with three repetitions and 26 treatments. The treatments consisted of inoculations of Bacillus sp. (BRM32110), Serratia sp. (BRM32114), Azospirillum sp. (1381), Bacillus sp. (1301), A. brasilense (Ab-V5) and a pool of Trichoderma asperellum in isolation or in a mixture in addition to a control treatment (without application of microorganisms). Microorganisms significantly affected gas exchange, biomass production and nutrient accumulation in upland rice plants. The mixed treatments of BRM32114 + pool of T. asperellum an...
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Better understanding of the use of cover crops at no-tillage systems in upland rice crop could contribute to increase grain production in this environment and allow moving toward sustainable agriculture. The objective of this research was... more
Better understanding of the use of cover crops at no-tillage systems in upland rice crop could contribute to increase grain production in this environment and allow moving toward sustainable agriculture. The objective of this research was to determine the effect of pearl millet intercropped with other cover crops on N mineral forms and urease activity in the soil, nitrate reductase enzyme activity in the leaves and yield components and grain yield of upland rice. The experiment was performed in the year 2012/2013 in two locations, in Haplorthox soil under no-tillage system. The experimental design was a complete randomized block with eight replications. The treatments consisted of four types of cover crop [(1) Pearl millet ('Pennisetum glaucum') - control; (2) Pearl millet + 'Crotalaria spectabilis'; (3) Pearl millet + 'Brachiaria ruziziensis'; (4) Pearl millet + 'C. spectabilis + B. ruziziensis']. The mixture of cover crops pearl millet + 'C. spe...
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The objective of this work was to characterize the population of Syagrus oleracea collected in 106 counties in Goias State. Plants showed, in average, six living leaves per plant and 83% of plants had between two and seven living leaves.... more
The objective of this work was to characterize the population of Syagrus oleracea collected in 106 counties in Goias State. Plants showed, in average, six living leaves per plant and 83% of plants had between two and seven living leaves. The average of perimeter of the stem circumference, at 10cm above ground was 43 cm and the stem height had 203 cm. The population showed high variability regarding wit the evaluated characteristics.
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The foliar application of nitrogen on the common bean crop is becoming an usually practice among the higher farmers. However, this application does not always lead to a difference in the crop grain yield. The objective of this study was... more
The foliar application of nitrogen on the common bean crop is becoming an usually practice among the higher farmers. However, this application does not always lead to a difference in the crop grain yield. The objective of this study was to determine the effect of rate and time of foliar nitrogen application on grain yield of two common bean cultivars. The field experiment was conducted at the 2013 in Santo Antonio de Goias, GO, in a soil under Cerrado during winter (May to August). The experimental design was a randomized block in factorial 5 x 4 x 2, factor A: N rates; factor B: crop phonological stage when N was applied; factor C: cultivar, with four replications. The treatments consisted of five nitrogen rates (0, 0.4, 0.8, 0.12 and 0.16 kg urea ha) applied to the common bean leaves with four phenological stages of crop development (R5, R6, R7 and R8). The studied cultivars were BRS Notavel and BRS Ametista. The application of increasing rates of nitrogen applied to the leaves an...
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O objetivo desse trabalho foi determinar o efeito de doses e epocas de aplicacao de N nos parâmetros produtivos e na qualidade comercial de graos de cultivares de feijoeiro. Foram conduzidos dois experimentos em condicoes de campo na... more
O objetivo desse trabalho foi determinar o efeito de doses e epocas de aplicacao de N nos parâmetros produtivos e na qualidade comercial de graos de cultivares de feijoeiro. Foram conduzidos dois experimentos em condicoes de campo na safra de inverno de 2015. No primeiro, foi utilizado o esquema fatorial 2 x 2 x 7. Os tratamentos foram compostos por duas cultivares (FC 104 e BRS Estilo), duas epocas de aplicacao de N (semeadura e cobertura) com sete doses de N (0, 25, 50, 75, 100, 125 e 150 kg ha-1). No segundo, o delineamento foi fatorial 2 x 5. Os tratamentos foram as mesmas cultivares e cinco manejos de N (100 kg ha-1 de N na semeadura e 0 kg ha-1 em cobertura, 75 kg ha-1 de N na semeadura e 25 kg ha-1 em cobertura, 50 kg ha-1 de N na semeadura e 50 kg ha-1 em cobertura, 25 kg ha-1 de N na semeadura e 75 kg ha-1 em cobertura, e 0 kg ha-1 de N na semeadura e 100 kg ha-1 em cobertura). Doses crescentes de N proporciona incrementos no numero de vagens por planta e na produtividade d...
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The use of the technology Penergetic has been proposed for achieving higher crop yields due to further optimization in the use of soil nutrients, especially phosphorus. The objective was to determine the grain yield and yield components... more
The use of the technology Penergetic has been proposed for achieving higher crop yields due to further optimization in the use of soil nutrients, especially phosphorus. The objective was to determine the grain yield and yield components of common bean as affected by phosphorus fertilization and application of Penergetic. The experiments were conducted in field conditions irrigated in two growing seasons. The experimental design was a randomized block design in a factorial 4 x 2. The treatments consisted of four levels of phosphorus in the soil (0, 40, 80 and 120 kg ha -1 of P2O5) in the presence and absence of Penergetic application. Phosphorus fertilization allowed significant increases in grain yield and yield components of common bean in the two growing season. Using Penergetic independent of the phosphorus application allowed higher grain yield than the treatments without application of the product in the two growing season. In 2013, the application of Penergetic allowed the hig...
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Submetido em 25/02/2014 e aprovado em 11/08/2015. 1 Universidade Estadual Paulista, Faculdade de Engenharia de Ilha Solteira, Departamento de Fitotecnia, Tecnologia de Alimentos e Socio-Economia, Ilha Solteira, Sao Paulo, Brasil.... more
Submetido em 25/02/2014 e aprovado em 11/08/2015. 1 Universidade Estadual Paulista, Faculdade de Engenharia de Ilha Solteira, Departamento de Fitotecnia, Tecnologia de Alimentos e Socio-Economia, Ilha Solteira, Sao Paulo, Brasil. arf@agr.feis.unesp.br 2 Universidade Estadual Paulista, Faculdade de Engenharia de Ilha Solteira, Departamento de Fitossanidade, Engenharia Rural e Solos, Ilha Solteira, Sao Paulo, Brasil. ricardo@agr.feis.unesp.br 3 Embrapa Arroz e Feijao, Santo Antonio de Goias, Goias, Brasil. adriano.nascente@embrapa.br 4 Embrapa Arroz e Feijao, Santo Antonio de Goias, Goias, Brasil. mabio.lacerda@embrapa.br *Autor para correspondencia: adriano.nascente@embrapa.br Espacamento e adubacao nitrogenada afetando o desenvolvimento do arroz de terras altas sob plantio direto A produtividade de graos do arroz e resultante da interacao entre o ambiente e o cultivar utilizado. Entre os fatores que influenciam essa produtividade estao o arranjo das plantas no campo e a adubacao nit...
Climate warming may be exacerbated if rising temperatures stimulate losses of soil carbon to the atmosphere. The direction and magnitude of this carbon-climate feedback are uncertain, largely due to lack of knowledge of the thermal... more
Climate warming may be exacerbated if rising temperatures stimulate losses of soil carbon to the atmosphere. The direction and magnitude of this carbon-climate feedback are uncertain, largely due to lack of knowledge of the thermal adaptation of the physiology and composition of soil microbial communities. Here, we applied the macromolecular rate theory (MMRT) to describe the temperature response of the microbial decomposition of soil organic matter (SOM) in a natural long-term warming experiment in a geothermally active area in New Zealand. Our objective was to test whether microbial communities adapt to long-term warming with a shift in their composition and their temperature response that are consistent with evolutionary theory of trade-offs between enzyme structure and function. We characterized the microbial community composition (using metabarcoding) and the temperature response of microbial decomposition of SOM (using MMRT) of soils sampled along transects of increasing distance from a geothermally active zone comprising two biomes (a shrubland and a grassland) and sampled at two depths (0-50 and 50-100 mm), such that ambient soil temperature and soil carbon concentration varied widely and independently. We found that the different environments were hosting microbial communities with distinct compositions, with thermophile and thermotolerant genera increasing in relative abundance with increasing ambient temperature. However, the ambient temperature had no detectable influence on the MMRT parameters or the relative temperature sensitivity of decomposition (Q10 ). MMRT parameters were, however, strongly correlated with soil carbon concentration and carbon:nitrogen ratio. Our findings suggest that, while long-term warming selects for warm-adapted taxa, substrate quality and quantity exert a stronger influence than temperature in selecting for distinct thermal traits. The results have major implications for our understanding of the role of soil microbial processes in the long-term effects of climate warming on soil carbon dynamics and will help increase confidence in carbon-climate feedback projections.
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Potassium (K) is the second most uptaken nutrient by upland rice crops. Beneficial microorganisms, such as Rhizobacteria participate in different processes that affect transformation of soil nutrients, making them available to plants.... more
Potassium (K) is the second most uptaken nutrient by upland rice crops. Beneficial microorganisms, such as Rhizobacteria participate in different processes that affect transformation of soil nutrients, making them available to plants. However, there are no information about the use of Rhizobacteria and different rates of K fertilization in this crop. To elucidate this interaction, the objective of this study was to determine the effect of the rhizobacteria Serratia spp. strain BRM 32114 and doses of K at sowing fertilization on upland rice development. The experimental design was a complete randomized block in a factorial 4 × 2 scheme with four replications, under no-tillage systems conducted in the Brazilian Cerrado during 2015/16 and 2016/17 growing seasons. The treatments consisted of four K2O doses (0, 20, 40 and 60 kg ha-1) without or with rhizobacteria applied three times in the field (on the seeds, sprayed over the soil, seven days after sowing and sprayed on the plants, 14 d...
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Water availability for cultivation of irrigated rice (Oryza sativa L.) is decreasing worldwide. Therefore, new technologies are needed to grow rice under aerobic conditions, in order to produce rice grains without yield losses and with... more
Water availability for cultivation of irrigated rice (Oryza sativa L.) is decreasing worldwide. Therefore, new technologies are needed to grow rice under aerobic conditions, in order to produce rice grains without yield losses and with lower water consumption. This study aimed at determining the best combination of management options for producing upland rice. A randomized blocks design, in a factorial scheme, was used. The treatments consisted of a combination of five rice cultivars (BRS Caçula, BRS Serra Dourada, BRS Primavera, BRS Sertaneja and BRS Esmeralda) with two compaction pressures in the seed furrow (25 kPa or 126 kPa), two types of seed treatment (with or without pesticide) and two types of N management (all at sowing or all at topdressing). Applying N at sowing instead of at topdressing produced higher grain yield in the no-tillage system (NTS). Under this system, upland rice genotypes show higher grain yield with higher compaction pressure. Seed treatment with pesticid...
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RESUMO A aplicação de solução de micropartículas de calcário (CaCO3) no sulco de semeadura pode alterar rapidamente os atributos químicos do solo, na zona de emissão de raízes, e aumentar a produtividade do feijoeiro-comum. O objetivo... more
RESUMO A aplicação de solução de micropartículas de calcário (CaCO3) no sulco de semeadura pode alterar rapidamente os atributos químicos do solo, na zona de emissão de raízes, e aumentar a produtividade do feijoeiro-comum. O objetivo deste estudo foi o de testar essa hipótese em solos com diferentes características químicas. Foram realizados dois experimentos. No primeiro, avaliaram-se doses de soluções de CaCO3 (0, 1050, 2100, 4200, 8400 e 12600 g ha-1), aplicadas no sulco de semeadura, em dois anos agrícolas consecutivos. No segundo, o CaCO3 (1050 g ha-1) foi aplicado, ou não, no sulco de semeadura, em quatro ambientes. Os delineamentos experimentais foram em blocos ao acaso. A aplicação de solução de micropartículas de CaCO3, no sulco de semeadura do feijoeiro, aumentou os valores de pH e reduziu a saturação por Al+3 no solo. Os teores de Ca, K e a saturação por bases no solo não foram influenciadas pela adição de CaCO3 no sulco. O uso de micropartículas de CaCO3 no sulco de sem...
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The use of cover crops in no-tillage systems (NTS) can significantly improve the soil's fertility. Thus, a study was performed to evaluate changes in chemical properties of soil caused by cover crops in a no-tillage system. The field... more
The use of cover crops in no-tillage systems (NTS) can significantly improve the soil's fertility. Thus, a study was performed to evaluate changes in chemical properties of soil caused by cover crops in a no-tillage system. The field experiment consisted of the following crop rotation: cover crops/rice/cover crops/rice. The experimental design was in randomized blocks with three replications. Treatments consisted of four cover crops (Brachiaria brizantha(Hochst. ex A. Rich.) Stapf. cv. Marandu, Brachiaria ruziziensis R. Germ. and C.M. Evrard, Panicum maximum Jacq. cv. Colonião, and Pennisetum glaucum(L.) R. Br. cv. BN-2) and fallow (control treatment). Soil samples were collected at the beginning of the summer crop in Oct 2007, Oct 2008 and Oct 2009 at 0-5 cm soil depth. The use of cover crops provided for a significant increase in the level of nutrients, soil organic matter, cation exchange capacity, and base saturation in the soil. Soil fertility improved from the first to sec...
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As plantas de cobertura têm a finalidade de cobrir, proteger o solo e fornecer palhada para o Sistema de Plantio Direto (SPD), e são cultivadas em áreas que seriam destinadas ao pousio ou antecedendo culturas comerciais. O uso dessas... more
As plantas de cobertura têm a finalidade de cobrir, proteger o solo e fornecer palhada para o Sistema de Plantio Direto (SPD), e são cultivadas em áreas que seriam destinadas ao pousio ou antecedendo culturas comerciais. O uso dessas plantas no SPD na região do Cerrado pode proporcionar melhorias nas condições físicas, químicas e biológicas dos solos, bem como na saúde e desenvolvimento das culturas de interesse econômico. Na escolha da planta de cobertura para a sua área o produtor deve optar por espécies que atendam às suas necessidades e que tenham bom desenvolvimento na região. Existe uma grande variedade de espécies adaptadas à região do Cerrado, principalmente do grupo das gramíneas ou leguminosas, que podem proporcionar benefícios distintos ao solo e às culturas comerciais. As espécies também possuem características diferentes que podem favorecer o melhor aproveitamento dos recursos do meio, ou ter efeito sinergético nos benefícios proporcionados pelo uso de somente uma espéc...
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The common bean production system is majorly based on the use of granular fertilizers to provide nutrients for the crop. Studies on the use of liquid fertilization at an appropriated depth and, seed inoculation with Rhizobium tropici can... more
The common bean production system is majorly based on the use of granular fertilizers to provide nutrients for the crop. Studies on the use of liquid fertilization at an appropriated depth and, seed inoculation with Rhizobium tropici can provide significant increases in the grain yield of the common bean. The objective of this study was to determine the growth and productivity of common bean as affected by N-P formulations, application depths and the inoculation with R. tropici. Field experiments were carried out in 2015 and 2016 cropping years using a complete block design, in a 2x2x2 factorial arrangement, with four replicates. The treatments involved the combination of N-P formulation (granular and liquid), two application depths of the N-P formulation (6 and 12 cm) and with or without rhizobia inoculant. The plant density (PD), number of pods (NP), number of grains (NG), mass of 100 grains (M100) and grain yield (GY) were determined. The granular and liquid N-P formulations prov...
Microrganismos multifuncionais são microrganismos benéficos que apresentam mecanismos diretos e indiretos de promoção de crescimento vegetal e apresentam um papel importante como uma tecnologia alternativa rumo á escala para uma... more
Microrganismos multifuncionais são microrganismos benéficos que apresentam mecanismos diretos e indiretos de promoção de crescimento vegetal e apresentam um papel importante como uma tecnologia alternativa rumo á escala para uma agricultura sustentável. O aumento da demanda pela produção agrícola com uma redução significativa do uso de fertilizantes e pesticidas sintéticos é um grande desafio na atualidade. O estudo desses microrganismos vem merecendo destaque nos últimos anos em razão da grande demanda por tecnologias sustentáveis, podendo reduzir os custos de produção, aumentando a produtividade e a rentabilidade do agronegócio. A aplicação de microrganismos multifuncionais através de mecanismos diretos e indiretos tem mostrado que é possível tornar as práticas de manejo das culturas ambientalmente mais sustentáveis. Os mecanismos dos microrganismos multifuncionais incluem a regulação do equilíbrio hormonal, solubilização de nutrientes na solução do solo e indução de resistência c...
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The high price of rice hybrid seeds is one of the major limiting factors for increasing the use of this technology. An important step toward minimizing high rice hybrid seed cost is developing techniques that help improve hybrid seed... more
The high price of rice hybrid seeds is one of the major limiting factors for increasing the use of this technology. An important step toward minimizing high rice hybrid seed cost is developing techniques that help improve hybrid seed yield. Our goal was to determine the proportion of seeds of line A (receptor) and line R (pollinator) that, under mixed sowing, would allow optimized rice hybrid seed production and grain quality. Trials were performed for two growing seasons in the southern region of Brazil. The cultivar INTA Puita was used as a pollinator and line 464 A as receptor. The experimental design was a randomized block with four replications. Treatments included six proportions of seeds of the INTA Puita (0.75, 1.5, 3.0, 6.0, 12.0, and 24.00%) mixture with seeds of line 464 A (99.25, 98.50, 97.00, 94.00, 88.00, and 76%, respectively). By increasing the percentage of the pollinator seeds (INTA Puita CL) from 0.75 to 24% in the mixture with the receptor (line 464 A), we increa...
Tropical flooded rice production systems require a high input of fertilizers and chemical defensive. The use of plant growth-promoting rhizobacteria (PGPR), a sustainable component of this system, can increase nutrient-use efficiency and... more
Tropical flooded rice production systems require a high input of fertilizers and chemical defensive. The use of plant growth-promoting rhizobacteria (PGPR), a sustainable component of this system, can increase nutrient-use efficiency and lead to significant increases in the grain yield of tropical flooded rice crop. This study aimed to determine the effect of the microorganism BRM 32110 (Bacillus thuringiensis) in combination with nitrogen (N), phosphorus (P) and potassium (K) application rates on the physiological and agronomic performance of tropical flooded rice plants. Trials were performed in the 2016/2017 growing season in Formoso do Araguaia, a city in Tocantins state, Brazil. Three independent experiments (E1, E2, and E3) were performed in a randomized block design in a 4 x 2 factorial scheme with three replications. E1 comprised four N application rates (0, 40, 80 and 120 kg N ha-1) with and without the addition of BRM 32110, E2 comprised four P2O5 application rates (0, 40,...
Multifunctional microorganisms can contribute significantly to improve plant performance and are innovative technology for sustainable development. Thus, objective of this study was to determine the effect of bioagents applied alone or in... more
Multifunctional microorganisms can contribute significantly to improve plant performance and are innovative technology for sustainable development. Thus, objective of this study was to determine the effect of bioagents applied alone or in mix on the performance of upland rice. The experiment was conducted in a greenhouse in a completely randomized design with four replications. The 26 treatments consisted of the rhizobacteria Bacillus sp. (BRM 32109, BRM 32110 and 1301), Azospirillum sp. (1381), Azospirillum brasilense (Ab-V5), Pseudomonas sp. (BRM 32112), Pseudomonas fluorescens (BRM 32111), Burkholderia pyrrocinia (BRM 32113), Serratia sp. (BRM 32114), and a fungal genus formed by a pool of Trichoderma asperellum (T-06, T-09, T-12, and T-52), applied alone or in mix, plus a control treatment without microorganism application. The most effective treatments were the mixes of microorganisms 1301 + Ab-V5 and BRM 32114 + pool of Trichoderma asperellum, as they provided an average incre...
The use of beneficial microorganisms in crop systems can contribute to sustainable agriculture by promoting improvements in crop development and grain yield without damaging the environment. However, there is much uncertainty surrounding... more
The use of beneficial microorganisms in crop systems can contribute to sustainable agriculture by promoting improvements in crop development and grain yield without damaging the environment. However, there is much uncertainty surrounding the effects of using a combination of microorganisms to promote plant development. The objective of this work was to determine the effects of microorganism species individually and in combination on the biomass production, gas exchange and nutrient contents in the shoots and roots of soybean plants. The experimental design was completely randomized, with 30 treatments and three replicates. The treatments consisted of the application of the rhizobacteria BRM 32109, BRM 32110 and 1301 (Bacillussp.); BRM 32111 and BRM 32112 (Pseudomonas sp.); BRM 32113 (Burkholderia sp.); BRM 32114 (Serratia sp.); Ab-V5 (Azospirillum bras ilense) and 1381 (Azospirillum sp.); the fungus Trichoderma asperellum (a mixture of the isolates UFRA. T06, UFRA. T09, UFRA. T12 an...
A aplicação foliar do nitrogênio na cultura do feijoeiro comum vem se tornando prática comum dentre os produtores rurais mais tecnificados. Entretanto essa aplicação nem sempre conduz a um diferencial de produtividade na cultura. Assim, o... more
A aplicação foliar do nitrogênio na cultura do feijoeiro comum vem se tornando prática comum dentre os produtores rurais mais tecnificados. Entretanto essa aplicação nem sempre conduz a um diferencial de produtividade na cultura. Assim, o objetivo do trabalho foi de determinar o efeito de doses e épocas de aplicação de nitrogênio via foliar na produtividade de grãos de duas cultivares de feijoeiro comum. O experimento de campo foi conduzido na safra agrícola 2013 no município de Santo Antônio de Goiás em solo sob Cerrado no período de inverno (maio-agosto). O delineamento experimental foi em blocos ao acaso no esquema fatorial 5 x 4, com quatro repetições. Os tratamentos constaram da combinação de cinco doses de nitrogênio (0; 0,4; 0,8; 0,12 e 0,16 kg de ureia ha-1) aplicados via foliar com quatro estádios de desenvolvimento fenológico da cultura (R5, R6, R7 e R8). As cultivares estudadas forma BRS Ametista e BRS Notável. A aplicação de doses crescentes de nitrogênio aplicados via f...
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In order to reach an optimum and sustainable production, growers must know the fertilizing potassium (K) and phosphorous (P) application rates. The present study aimed to determine the rice development in response to combined rates of P... more
In order to reach an optimum and sustainable production, growers must know the fertilizing potassium (K) and phosphorous (P) application rates. The present study aimed to determine the rice development in response to combined rates of P and K, on Plinthaquults (380-400 g kg-1 of clay), under high and low fertility conditions, in the tropical lowland plain of the Araguaia river, Brazil. Three field experiments were performed, each one consisting of a completely randomized factorial block design, with three replications. Treatments included a combination of six K2O rates (0 kg ha-1, 30 kg ha-1, 60 kg ha-1, 90 kg ha-1, 120 kg ha-1 and 150 kg ha-1) with six P2O5 rates (0 kg ha-1, 30 kg ha-1, 60 kg ha-1, 90 kg ha-1, 120 kg ha-1 and 150 kg ha-1). No interaction effect between P and K rates was observed for the evaluated variables in any fertility level/year. Phosphorous application under low fertility conditions, as well as K under high fertility conditions, affect overall crop nutrition,...
There is little information about common bean fertilization in African Savannas. The objectives of this study were as follows: i) to evaluate the common bean yield potential in the environmental conditions of Lichinga, Niassa, Mozambique,... more
There is little information about common bean fertilization in African Savannas. The objectives of this study were as follows: i) to evaluate the common bean yield potential in the environmental conditions of Lichinga, Niassa, Mozambique, and ii) to determine the common bean response to phosphorus and potassium fertilization applied together in order to verify whether the interpretation of soil analysis for the Brazilian Cerrado could be adopted for Savanna soils in Mozambique. The experimental design was a randomized block design in a 5 x 4 x 2 factorial arrangement. Treatments consisted of a combination of phosphorus doses (0, 35, 70, 140 and 280 kg ha-1 of P2O5), potassium doses (0, 50 100 and 200 kg ha-1 of K2O), and different growing seasons (2012/2013 and 2013/2014). The field rainfed experiments were conducted in Lichinga city, province of Niassa. Common bean crops presented high productivity potential in rainfed systems in the environmental conditions of Lichinga, Niassa, Mo...
Besides providing benefits to the environment such as soil protection, release of nutrients, soil moisture maintenance, and weed control, cover crops can increase food production for grain production. The aim of this study was to evaluate... more
Besides providing benefits to the environment such as soil protection, release of nutrients, soil moisture maintenance, and weed control, cover crops can increase food production for grain production. The aim of this study was to evaluate the production of biomass and grain cover crops (and its respective effects on soil chemical and physical attributes), yield components, and grain yield of rice in Mozambique. The study was conducted in two sites located in the province of Cabo Delgado, in Mozambique. The experimental design was a randomized block in a 2 × 6 factorial, with four repetitions. Treatments were carried out in two locations (Cuaia and Nambaua) with six cover crops: Millet (Pennisetum glaucum L.); namarra bean (Lablab purpureus (L.) Sweet), velvet beans (Mucuna pruriens L.), oloco beans (Vigna radiata (L.) R. Wilczek), cowpea (Vigna unguiculata L.), and fallow. Cover crops provided similar changes in chemical and physical properties of the soil. Lablab purpureus, Vigna u...
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A better understanding of the differential growth of common bean cultivars with increasing soil sulfur (S) availability can indicate how to improve common bean grain yield in soils of Savannas. The objective of this study was to evaluate... more
A better understanding of the differential growth of common bean cultivars with increasing soil sulfur (S) availability can indicate how to improve common bean grain yield in soils of Savannas. The objective of this study was to evaluate the response of sprinkler-irrigated common bean cultivars to sulfur fertilization in a no-tillage system. The experiment was designed as a randomized block in a split-plot scheme with sulfur rates (0, 10, 20, 40, and 60 kg ha-1) as main plots and common bean cultivars (BRS Requinte, BRS Cometa, Diamante Negro, BRS Grafite, BRS Valente, and Corrente) as subplots, with three replications. Common bean cultivars did not differ regarding grain yield response to sulfur rates, which fitted to a quadratic equation. Among the cultivars tested, only BRS Requinte and BRS Valente differed in grain yield for S fertilization, the first being more productive. Moreover, S fertilization allows significant increases in common bean grain yield in average of six cultiv...
Potassium (K) is an essential nutrient for upland rice growth, but little information on the effects of K on root growth and nutrient uptake capacity of upland rice is found. Therefore, an experiment was conducted under greenhouse... more
Potassium (K) is an essential nutrient for upland rice growth, but little information on the effects of K on root growth and nutrient uptake capacity of upland rice is found. Therefore, an experiment was conducted under greenhouse conditions to evaluate the influence of soil K levels on root growth and nutrient uptake of four upland rice cultivars. A completely randomized experimental design, in a 4x4 factorial scheme (4 levels of K: 20, 40, 80, and 160 mg dm-3; 4 cultivars: Caiapó, BRS-Primavera, IAC-202, and Maravilha) was used, with four replications. Based on regression equations, the highest values of root length density would be found with 136 mg dm-3 of K. The root diameter and dry matter, shoot dry matter and shoot K concentration increased linearly with the increasing K rates. The shoot K concentration of the upland rice cultivars did not differ. The increased level of K in the soil reduced the shoot Ca concentration of intermediate and modern cultivars, and the shoot Mg co...