Over 20 years working experience at international agricultural research centers in Plant Breeding, Seed System, Technology Transfer and Project Management.
Consortium Members Dr Hippolyte Affognon, Project Manager, ICRISAT Dr Haile Desmae, Breeder, ... more Consortium Members Dr Hippolyte Affognon, Project Manager, ICRISAT Dr Haile Desmae, Breeder, ICRISAT Dr Ayoni Ogunbayo, Seed System Specialist, ICRISAT Dr Jummai O. Yila, Gender Specialist, ICRISAT Dr Peter Rein Gildemacher Seed Sector Expert, KIT Dr Gerard Baltissen, Integrated Seed Sector Expert, KIT Dr Dramane Sako, Breeder and Seed System, IER Mali Mr. Mamary Traoré, Research Assistant, IER Mali Dr Doris Kanvenaa Puozaa, Seed Scientist, SARI Ghana Dr Prince Maxwell Etwire, Agricultural Economist –SARI Dr Traoré Kokozié, CEO SOPROSA, Mali Mr. Amara Sacko, Seed Production Expert, SOPROSA Mr. Sumani Iddrisu Zakaria, CEO Heritage Seed, Ghana Mr. Abukari Abdulai, Production Manager, Heritage Seed Impact activities Activities to enhance impact Organize radio broadcasts on improved varieties and good agricultural practices Organize local mini seed fairs to enhance producers’ participation Train seed producers on good agricultural practices of seed prod...
This study was carried out on the site of oil palm agro-industrial exploitation in South-East Gab... more This study was carried out on the site of oil palm agro-industrial exploitation in South-East Gabon. The aim was to evaluate effectiveness of three herbicides: Roundup (glyphosate), Finish (c) and Ally (metsulfuron methyl) on the weed flora. An inventory weed flora was conducted to estimate abundance-dominance, post-treatment patch coverage, weed recurrence time, and the optimal herbicide application rate. The results obtained show that the weed flora is composed of 22 dominant species, divided into 20 genera and 15 families. The three predominance families are Rubiaceae, Poaceae and Cyperaceae. A mixture of two herbicides, specifically Finish Ally (glyphosate-metsulfuron methyl and metsulfuron methyl), is the most effective, with 85% of weeds eliminated by day 30 and 74 days of recurrence. KeywordsGlyphosate, Methyl Metsulfuron, Oil Palm, Weeds
This paper investigates the welfare impacts of improved groundnut adoption in Ghana, Mali, and Ni... more This paper investigates the welfare impacts of improved groundnut adoption in Ghana, Mali, and Nigeria using three-year balanced panel data collected from 2,868 households. We apply the Cragg double hurdle model to understand the adoption process and a fixed-effects instrumental variable approach to estimate the impact on gross margins, household income, per capita income, food security, and poverty. The results show that a 10% increase in the area planted with improved groundnut varieties is associated with a 25.6%, 14.8%, 6.9%, and 23.6% increase in groundnut gross margins, household income, per capita income, and food consumption score, respectively. Likewise, this leads to a 3.6% poverty reduction. The highest average impact is found in Nigeria, followed by Ghana and Mali. Furthermore, disaggregating the impacts by adoption history reveals that households that continuously adopted the improved groundnut varieties benefited more than other categories of adopters. They enjoy a 6.6% poverty reduction compared to 1.9% for households that cultivated improved groundnut varieties for a single year. We conclude that improved groundnut varieties' adoption is a promising pathway for rural poverty alleviation and food security improvement. Hence, encouraging households to adopt improved groundnut varieties for consecutive years could help capitalize on income gains and contribute to raising households above the poverty threshold.
This paper investigates the welfare impacts of improved groundnut adoption in Ghana, Mali, and Ni... more This paper investigates the welfare impacts of improved groundnut adoption in Ghana, Mali, and Nigeria using three-year balanced panel data collected from 2,868 households. We apply the Cragg double hurdle model to understand the adoption process and a fixed-effects instrumental variable approach to estimate the impact on gross margins, household income, per capita income, food security, and poverty. The results show that a 10% increase in the area planted with improved groundnut varieties is associated with a 25.6%, 14.8%, 6.9%, and 23.6% increase in groundnut gross margins, household income, per capita income, and food consumption score, respectively. Likewise, this leads to a 3.6% poverty reduction. The highest average impact is found in Nigeria, followed by Ghana and Mali. Furthermore, disaggregating the impacts by adoption history reveals that households that continuously adopted the improved groundnut varieties benefited more than other categories of adopters. They enjoy a 6.6% poverty reduction compared to 1.9% for households that cultivated improved groundnut varieties for a single year. We conclude that improved groundnut varieties' adoption is a promising pathway for rural poverty alleviation and food security improvement. Hence, encouraging households to adopt improved groundnut varieties for consecutive years could help capitalize on income gains and contribute to raising households above the poverty threshold.
Forty-eight rice accessions collected from the Africa Rice Center were screened against major low... more Forty-eight rice accessions collected from the Africa Rice Center were screened against major lowland biotic and abiotic stresses to identify suitable accessions for crop improvement. The accessions were tested for genetic variability and stability of performance in twelve environments in Nigeria, Benin Republic and Togo between 2008 and 2009 using Additive Main Effect and Multiplicative Interaction (AMMI) and Genotype+ Genotype x Environment (GGE) biplot models. Accessions were then characterized using morphological and simple sequence repeat (SSR) molecular markers. Principal component analysis (PCA) was used to measure the contributions of yield and related traits to total variation. Morphological and molecular data were later subjected to multivariate analyses. Accessions TOG 5681, FARO 44 and IR75871-8-14-21-WAB1 were resistant to rice yellow mottle virus (RYMV), TOG 5681, NERICA-L 12 and IR75866-2-18-23-WAB1 were highly resistant to blast, seven accessions were resistant to ir...
Rice is staple food in many countries of Africa and a major part of the diet in many others. Howe... more Rice is staple food in many countries of Africa and a major part of the diet in many others. However, Africa’s demand for rice exceeds production with the deficit of 40% being imported. One way to improve Africa’s rice production is through breeding high yielding varieties suitable for the different environment conditions. This study was conducted to assess the genetic variability and stability performance of 48 lowland rice genotypes including 37 interspecific (Oryza glaberrima × Oryza sativa ssp. indica) and 11 intraspecific (O. sativa ssp. indica × O. sativa ssp. indica) in 12 environments in Nigeria, Benin Republic and Togo using Additive Main Effect and Multiplicative Interaction (AMMI) and Genotype+ Genotype x Environment (GGE) biplot models. The combined analysis of variance revealed significant differences (P<0.01) among the genotypes, environments, and genotypes x environment interaction. Both the AMMI and GGE models identified NERICA-L8 and NERICA-LI2 as the best genoty...
Rice is one of the major staple foods in Burkina Faso and in-country production covers about 60% ... more Rice is one of the major staple foods in Burkina Faso and in-country production covers about 60% of the demand and 40% is met from imports. The immense potential of the lowlands in Burkina Faso for durable intensification of rice cropping have not been realised due to biotic and abiotic constraints. Hence, there is an urgent need to increase and improve the production of rice in order to meet up with the high demand. To meet the demand, the rice research program in Burkina Faso evaluated intra and interspecific lowland progenies in 2002 and 2003. The aim of the study is to introduce new lowland NERICAs through a participatory approach and to identify ideotypes that are adapted to lowland conditions. Variations did exist among the 16 rice varieties with respect to the 9 variables that were evaluated. A principal components plot and clustering analysis technique were used to group the accessions. The interspecific varieties formed the most interesting group and have a better capacity ...
Africa Rice Center (AfricaRice) plays an important role in germplasm enhancement for their adapta... more Africa Rice Center (AfricaRice) plays an important role in germplasm enhancement for their adaptation to different ecologies of upland, lowland, irrigated, mangrove and deep water. The genebank of AfricaRice contains over 20,000 rice accessions, notably two cultivated species (Oryza sativa and O. glaberrima) and wild species (O. longistaminata, O. barthii and O. stapfii), which are being used in breeding programs. In recent years, NERICA rice suitable for upland, lowland and irrigated ecologies were developed from interspecific crosses between O. sativa and O. glaberrima. For the better utilization of O. glaberrima, characterization studies of genetic diversity have been made using both molecular and conventional tools. The screening of this material for biotic and abiotic stresses has allowed us to identify firstly, genes for resistance to major rice diseases such as rice yellow mottle virus, rice blast disease and insect pests, and secondly, new sources of tolerance to drought, sa...
1 SUMMARY To generate knowledge on rainfed upland rice production and to identify the existing nu... more 1 SUMMARY To generate knowledge on rainfed upland rice production and to identify the existing nutrient constraints in a derived savannah soil of West Africa, trials were conducted in 2005 and 2006 on three major soils in central and southern parts of Benin. An acrisol, a ferralsol and a plinthisol were investigated at Avokanzou and Cana in the South and at Sowe in central Benin, respectively. The trial was duplicated at Sowe and conducted in one year (2006) only while one trial was conducted per year at the other sites. A randomized complete block design with four replications of eight treatments was used. The rice variety used was NERICA 4 grown in plots of size 3 x 5m, and a spacing of 20 cm within and between plants. The complete fertilizer treatment (Fc) was composed of N, P, K, Ca, Mg and Zn and a specific nutrient was excluded from Fc in the other treatments (Fc-N, Fc-P, Fc-K, Fc-Ca, Fc-Mg and Fc-Zn). The zero fertilizer treatment (0) was used as the check. Respective fertili...
ABSTRACT Soil nutrient deficiencies can affect rice yield and grain mineral content wherever they... more ABSTRACT Soil nutrient deficiencies can affect rice yield and grain mineral content wherever they occur, but an understanding of their effect on upland rice production in humid forest zone of West Africa is still limited. Therefore, a nutrient omission trial was conducted on foot slope soil in 2003, 2004 and 2005 in Côte d’Ivoire using rice variety WAB 56–104. The effect on rice grain yield (GY) and nutrient content of complete fertilizer (Fc with nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg) and zinc (Zn)) was compared with Fc from which a specific nutrient was excluded (Fc – N, Fc – P, Fc – K, Fc – Ca, Fc – Mg and Fc – Zn). Before the trial, soil K (0.10 cmol kg−1) and Mg (0.20 cmol kg−1) contents were suitable, but available P-Bray I (4.2 mg kg−1) was found to be deficient. In course of the study, K, Mg and P deficiencies were observed. An antagonistic effect was observed between rice GY and grain concentrations in P, Mg and Ca for treatments Fc – Mg, Fc – P and Fc – K, respectively. Therefore, the use of P, K and Mg fertilizers is recommended for successive cropping seasons in order to rich stable and high rice yield while decreasing of grain concentrations in P, Mg and Ca can be observed.
Consortium Members Dr Hippolyte Affognon, Project Manager, ICRISAT Dr Haile Desmae, Breeder, ... more Consortium Members Dr Hippolyte Affognon, Project Manager, ICRISAT Dr Haile Desmae, Breeder, ICRISAT Dr Ayoni Ogunbayo, Seed System Specialist, ICRISAT Dr Jummai O. Yila, Gender Specialist, ICRISAT Dr Peter Rein Gildemacher Seed Sector Expert, KIT Dr Gerard Baltissen, Integrated Seed Sector Expert, KIT Dr Dramane Sako, Breeder and Seed System, IER Mali Mr. Mamary Traoré, Research Assistant, IER Mali Dr Doris Kanvenaa Puozaa, Seed Scientist, SARI Ghana Dr Prince Maxwell Etwire, Agricultural Economist –SARI Dr Traoré Kokozié, CEO SOPROSA, Mali Mr. Amara Sacko, Seed Production Expert, SOPROSA Mr. Sumani Iddrisu Zakaria, CEO Heritage Seed, Ghana Mr. Abukari Abdulai, Production Manager, Heritage Seed Impact activities Activities to enhance impact Organize radio broadcasts on improved varieties and good agricultural practices Organize local mini seed fairs to enhance producers’ participation Train seed producers on good agricultural practices of seed prod...
This study was carried out on the site of oil palm agro-industrial exploitation in South-East Gab... more This study was carried out on the site of oil palm agro-industrial exploitation in South-East Gabon. The aim was to evaluate effectiveness of three herbicides: Roundup (glyphosate), Finish (c) and Ally (metsulfuron methyl) on the weed flora. An inventory weed flora was conducted to estimate abundance-dominance, post-treatment patch coverage, weed recurrence time, and the optimal herbicide application rate. The results obtained show that the weed flora is composed of 22 dominant species, divided into 20 genera and 15 families. The three predominance families are Rubiaceae, Poaceae and Cyperaceae. A mixture of two herbicides, specifically Finish Ally (glyphosate-metsulfuron methyl and metsulfuron methyl), is the most effective, with 85% of weeds eliminated by day 30 and 74 days of recurrence. KeywordsGlyphosate, Methyl Metsulfuron, Oil Palm, Weeds
This paper investigates the welfare impacts of improved groundnut adoption in Ghana, Mali, and Ni... more This paper investigates the welfare impacts of improved groundnut adoption in Ghana, Mali, and Nigeria using three-year balanced panel data collected from 2,868 households. We apply the Cragg double hurdle model to understand the adoption process and a fixed-effects instrumental variable approach to estimate the impact on gross margins, household income, per capita income, food security, and poverty. The results show that a 10% increase in the area planted with improved groundnut varieties is associated with a 25.6%, 14.8%, 6.9%, and 23.6% increase in groundnut gross margins, household income, per capita income, and food consumption score, respectively. Likewise, this leads to a 3.6% poverty reduction. The highest average impact is found in Nigeria, followed by Ghana and Mali. Furthermore, disaggregating the impacts by adoption history reveals that households that continuously adopted the improved groundnut varieties benefited more than other categories of adopters. They enjoy a 6.6% poverty reduction compared to 1.9% for households that cultivated improved groundnut varieties for a single year. We conclude that improved groundnut varieties' adoption is a promising pathway for rural poverty alleviation and food security improvement. Hence, encouraging households to adopt improved groundnut varieties for consecutive years could help capitalize on income gains and contribute to raising households above the poverty threshold.
This paper investigates the welfare impacts of improved groundnut adoption in Ghana, Mali, and Ni... more This paper investigates the welfare impacts of improved groundnut adoption in Ghana, Mali, and Nigeria using three-year balanced panel data collected from 2,868 households. We apply the Cragg double hurdle model to understand the adoption process and a fixed-effects instrumental variable approach to estimate the impact on gross margins, household income, per capita income, food security, and poverty. The results show that a 10% increase in the area planted with improved groundnut varieties is associated with a 25.6%, 14.8%, 6.9%, and 23.6% increase in groundnut gross margins, household income, per capita income, and food consumption score, respectively. Likewise, this leads to a 3.6% poverty reduction. The highest average impact is found in Nigeria, followed by Ghana and Mali. Furthermore, disaggregating the impacts by adoption history reveals that households that continuously adopted the improved groundnut varieties benefited more than other categories of adopters. They enjoy a 6.6% poverty reduction compared to 1.9% for households that cultivated improved groundnut varieties for a single year. We conclude that improved groundnut varieties&#39; adoption is a promising pathway for rural poverty alleviation and food security improvement. Hence, encouraging households to adopt improved groundnut varieties for consecutive years could help capitalize on income gains and contribute to raising households above the poverty threshold.
Forty-eight rice accessions collected from the Africa Rice Center were screened against major low... more Forty-eight rice accessions collected from the Africa Rice Center were screened against major lowland biotic and abiotic stresses to identify suitable accessions for crop improvement. The accessions were tested for genetic variability and stability of performance in twelve environments in Nigeria, Benin Republic and Togo between 2008 and 2009 using Additive Main Effect and Multiplicative Interaction (AMMI) and Genotype+ Genotype x Environment (GGE) biplot models. Accessions were then characterized using morphological and simple sequence repeat (SSR) molecular markers. Principal component analysis (PCA) was used to measure the contributions of yield and related traits to total variation. Morphological and molecular data were later subjected to multivariate analyses. Accessions TOG 5681, FARO 44 and IR75871-8-14-21-WAB1 were resistant to rice yellow mottle virus (RYMV), TOG 5681, NERICA-L 12 and IR75866-2-18-23-WAB1 were highly resistant to blast, seven accessions were resistant to ir...
Rice is staple food in many countries of Africa and a major part of the diet in many others. Howe... more Rice is staple food in many countries of Africa and a major part of the diet in many others. However, Africa’s demand for rice exceeds production with the deficit of 40% being imported. One way to improve Africa’s rice production is through breeding high yielding varieties suitable for the different environment conditions. This study was conducted to assess the genetic variability and stability performance of 48 lowland rice genotypes including 37 interspecific (Oryza glaberrima × Oryza sativa ssp. indica) and 11 intraspecific (O. sativa ssp. indica × O. sativa ssp. indica) in 12 environments in Nigeria, Benin Republic and Togo using Additive Main Effect and Multiplicative Interaction (AMMI) and Genotype+ Genotype x Environment (GGE) biplot models. The combined analysis of variance revealed significant differences (P<0.01) among the genotypes, environments, and genotypes x environment interaction. Both the AMMI and GGE models identified NERICA-L8 and NERICA-LI2 as the best genoty...
Rice is one of the major staple foods in Burkina Faso and in-country production covers about 60% ... more Rice is one of the major staple foods in Burkina Faso and in-country production covers about 60% of the demand and 40% is met from imports. The immense potential of the lowlands in Burkina Faso for durable intensification of rice cropping have not been realised due to biotic and abiotic constraints. Hence, there is an urgent need to increase and improve the production of rice in order to meet up with the high demand. To meet the demand, the rice research program in Burkina Faso evaluated intra and interspecific lowland progenies in 2002 and 2003. The aim of the study is to introduce new lowland NERICAs through a participatory approach and to identify ideotypes that are adapted to lowland conditions. Variations did exist among the 16 rice varieties with respect to the 9 variables that were evaluated. A principal components plot and clustering analysis technique were used to group the accessions. The interspecific varieties formed the most interesting group and have a better capacity ...
Africa Rice Center (AfricaRice) plays an important role in germplasm enhancement for their adapta... more Africa Rice Center (AfricaRice) plays an important role in germplasm enhancement for their adaptation to different ecologies of upland, lowland, irrigated, mangrove and deep water. The genebank of AfricaRice contains over 20,000 rice accessions, notably two cultivated species (Oryza sativa and O. glaberrima) and wild species (O. longistaminata, O. barthii and O. stapfii), which are being used in breeding programs. In recent years, NERICA rice suitable for upland, lowland and irrigated ecologies were developed from interspecific crosses between O. sativa and O. glaberrima. For the better utilization of O. glaberrima, characterization studies of genetic diversity have been made using both molecular and conventional tools. The screening of this material for biotic and abiotic stresses has allowed us to identify firstly, genes for resistance to major rice diseases such as rice yellow mottle virus, rice blast disease and insect pests, and secondly, new sources of tolerance to drought, sa...
1 SUMMARY To generate knowledge on rainfed upland rice production and to identify the existing nu... more 1 SUMMARY To generate knowledge on rainfed upland rice production and to identify the existing nutrient constraints in a derived savannah soil of West Africa, trials were conducted in 2005 and 2006 on three major soils in central and southern parts of Benin. An acrisol, a ferralsol and a plinthisol were investigated at Avokanzou and Cana in the South and at Sowe in central Benin, respectively. The trial was duplicated at Sowe and conducted in one year (2006) only while one trial was conducted per year at the other sites. A randomized complete block design with four replications of eight treatments was used. The rice variety used was NERICA 4 grown in plots of size 3 x 5m, and a spacing of 20 cm within and between plants. The complete fertilizer treatment (Fc) was composed of N, P, K, Ca, Mg and Zn and a specific nutrient was excluded from Fc in the other treatments (Fc-N, Fc-P, Fc-K, Fc-Ca, Fc-Mg and Fc-Zn). The zero fertilizer treatment (0) was used as the check. Respective fertili...
ABSTRACT Soil nutrient deficiencies can affect rice yield and grain mineral content wherever they... more ABSTRACT Soil nutrient deficiencies can affect rice yield and grain mineral content wherever they occur, but an understanding of their effect on upland rice production in humid forest zone of West Africa is still limited. Therefore, a nutrient omission trial was conducted on foot slope soil in 2003, 2004 and 2005 in Côte d’Ivoire using rice variety WAB 56–104. The effect on rice grain yield (GY) and nutrient content of complete fertilizer (Fc with nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg) and zinc (Zn)) was compared with Fc from which a specific nutrient was excluded (Fc – N, Fc – P, Fc – K, Fc – Ca, Fc – Mg and Fc – Zn). Before the trial, soil K (0.10 cmol kg−1) and Mg (0.20 cmol kg−1) contents were suitable, but available P-Bray I (4.2 mg kg−1) was found to be deficient. In course of the study, K, Mg and P deficiencies were observed. An antagonistic effect was observed between rice GY and grain concentrations in P, Mg and Ca for treatments Fc – Mg, Fc – P and Fc – K, respectively. Therefore, the use of P, K and Mg fertilizers is recommended for successive cropping seasons in order to rich stable and high rice yield while decreasing of grain concentrations in P, Mg and Ca can be observed.
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Papers by Ayoni Ogunbayo