Alireza Taab
Ilam University, Agronomy and Plant Breeding, Department Member
- I am a weed scientist and focus of my research is on weeds seed ecology and modelling and also interested in weed man... moreI am a weed scientist and focus of my research is on weeds seed ecology and modelling and also interested in weed management strategies.
I did my PhD studies at the Swedish University of Agricultural Sciences.edit
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A field experiment was conducted to study the effect of different methods of urea application on yield, yield components and maize grain composition. The investigated factors were urea fertilization methods (foliar application and soil... more
A field experiment was conducted to study the effect of different methods of urea application on yield, yield components and maize grain composition. The investigated factors were urea fertilization methods (foliar application and soil application as side dress) and four maize hybrids including NS 620, Konsur 580, Jeta 670 and control SC 704 arranged in a split plot based on complete block design with four replications. The results showed that soil urea application increased grain yield compared to foliar application, but protein percentage was higher when foliar application was used. The highest grain yield was achieved for NS 620 that was due to higher number of grain rows per ear, number of grains per ear row and plant height. Konsur 580 showed that the greatest protein percentage with foliar urea application. This study showed that urea application method can affect both the quality and quantity of grain maize.
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A field experiment was conducted to study the effect of different methods of urea application on yield, yield components and maize grain composition. The investigated factors were urea fertilization methods (foliar application and soil... more
A field experiment was conducted to study the effect of different methods of urea application on yield, yield components and maize grain composition. The investigated factors were urea fertilization methods (foliar application and soil application as side dress) and four maize hybrids including NS 620, Konsur 580, Jeta 670 and control SC 704 arranged in a split plot based on complete block design with four replications. The results showed that soil urea application increased grain yield compared to foliar application, but protein percentage was higher when foliar application was used. The highest grain yield was achieved for NS 620 that was due to higher number of grain rows per ear, number of grains per ear row and plant height. Konsur 580 showed that the greatest protein percentage with foliar urea application. This study showed that urea application method can affect both the quality and quantity of grain maize.
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Aim of study: To determine and quantify the effect of seed burial depths on the seedling emergence pattern of Amaranthus retroflexus in field conditions. Area of study: West of Iran (Ilam). Material and methods: The seedling emergence of... more
Aim of study: To determine and quantify the effect of seed burial depths on the seedling emergence pattern of Amaranthus retroflexus in field conditions. Area of study: West of Iran (Ilam). Material and methods: The seedling emergence of A. retroflexus was studied in an outdoor pot experiment, burying the seeds at 0, 2, 4, 6 and 8 cm in the soil in Ilam (Iran) in two consecutive years, 2010 and 2011. Different models were tested to predict the cumulative seedling emergence, and the log logistic model was found to be the best for this A. retroflexus population. Newly estimated Tb values, slightly different each year, but lower than those of the references, were estimated and set at 2.6 ºC and 0 ºC in 2010 and 2011, respectively. Main results: The seedling emergence in the west of Iran take place over a period from early February to late May. The level of seed dormancy can be reduced during autumn and winter burial in the soil or after a dry storage. Seed dormancy reduction resulted i...
Redroot Pigweed (Amaranthus retroflexus L.) is an important weed that is highly competitive with common bean. Photosynthetic pigments, the activity of antioxidant enzymes, the relative expression of a number of antioxidant enzyme and... more
Redroot Pigweed (Amaranthus retroflexus L.) is an important weed that is highly competitive with common bean. Photosynthetic pigments, the activity of antioxidant enzymes, the relative expression of a number of antioxidant enzyme and light response genes, were studied in three of common bean cultivars and in V4 and R7 stages under Redroot Pigweed free and infested. The presence of weeds reduced the content of chlorophyll, relative chlorophyll and anthocyanin of common bean leaves. With the increase of weed competition, the expression of antioxidant genes and enzymes increased, which indicates the increase of their activity in order to reduce the amount of reactive oxygen species. Among the studied antioxidant enzymes, the activity of catalase and ascorbate peroxidase produced in the leaves was higher than that of superoxide dismutase. With the increase of weed interference, the expression of phytochrome interacting factor 3 (PIF3) gene as a positive regulator of light signals is inc...
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Solanum nigrum L. (black nightshade) and Solanum physalifolium Rusby (hairy nightshade) are two important weeds in many crops. They reduce crop quantity by competition and crop quality by contaminating harvested products. The timing of... more
Solanum nigrum L. (black nightshade) and Solanum physalifolium Rusby (hairy nightshade) are two important weeds in many crops. They reduce crop quantity by competition and crop quality by contaminating harvested products. The timing of different control measures is a key factor in integrated weed management, which must be related with emergence of the weeds. Since emergence timing of the species is controlled by seed dormancy and temperature conditions, the effect of temperature on dormancy and germination has to be well understood. Experiments were conducted to study seed dormancy, the temperature effect on dormancy, dormancy cycle, germination characteristics, and emergence of the species. In addition, a simulation model was developed to study the effect of temperature on the dynamics of dormancy release and induction under different temperature conditions. I found differences in primary dormancy among populations of S. nigrum collected on two dates and in different locations. Fre...
Research Interests: Biology and Seed dormancy
Competitive interaction between maize, Xanthium strumarium and Datura stramonium affecting some canopy characteristics ... Hassan Karimmojeni1*, Hamid Rahimian Mashhadi2 , Saeed Shahbazi2, Alireza Taab3, Hassan Mohammad Alizadeh2 ...... more
Competitive interaction between maize, Xanthium strumarium and Datura stramonium affecting some canopy characteristics ... Hassan Karimmojeni1*, Hamid Rahimian Mashhadi2 , Saeed Shahbazi2, Alireza Taab3, Hassan Mohammad Alizadeh2 ... 1Department of Agronomy ...
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Field experiments were conducted in 2006 and 2007 to evaluate Xanthium strumarium and Datura stramonium single and multispecies interferences with maize. At different weed densities (4, 8, 12 and 16 plants m -2 ), X. strumarium and D.... more
Field experiments were conducted in 2006 and 2007 to evaluate Xanthium strumarium and Datura stramonium single and multispecies interferences with maize. At different weed densities (4, 8, 12 and 16 plants m -2 ), X. strumarium and D. stramonium were planted in five proportions of 0:100, 25:75, 50:50, 75:25 and 0:100. Monoculture of maize at 6 plant m -2 and pure stands of X. strumarium and D. stramonium at two densities of 4 and 16 plants m -2 were also included. The results showed that X. strumarium is the most competitive weed in mixed plant community of maize, X. strumarium and D. stramonium. Maize, mainly due to its greater height at high density of weeds and because of its greater height and LAI at low density of weeds, was more successful in competition for light than the two weed species. At mixture of X. strumarium and D. stramonium under competition with maize, X. strumarium due to its greater LAI and height, showed greater ability in light interception than the other weed...
Research Interests: Biology and Australian
Solanum nigrum L. (black nightshade) and Solanum physalifolium Rusby (hairy nightshade) are two important weeds in many crops. They reduce crop quantity by competition and crop quality by contaminating harvested products. The timing of... more
Solanum nigrum L. (black nightshade) and Solanum physalifolium Rusby (hairy nightshade) are two important weeds in many crops. They reduce crop quantity by competition and crop quality by contaminating harvested products. The timing of different control measures is a key factor in integrated weed management, which must be related with emergence of the weeds. Since emergence timing of the species is controlled by seed dormancy and temperature conditions, the effect of temperature on dormancy and germination has to be well understood. Experiments were conducted to study seed dormancy, the temperature effect on dormancy, dormancy cycle, germination characteristics, and emergence of the species. In addition, a simulation model was developed to study the effect of temperature on the dynamics of dormancy release and induction under different temperature conditions. I found differences in primary dormancy among populations of S. nigrum collected on two dates and in different locations. Fre...
Research Interests: Biology and Seed dormancy
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Page 1. Seed Dormancy and Germination in Solanum nigrum and S. physalifolium as Influenced by Temperature Conditions Alireza Taab Faculty of Natural Resource and Agricultural Sciences Department of Crop Production Ecology Uppsala Doctoral... more
Page 1. Seed Dormancy and Germination in Solanum nigrum and S. physalifolium as Influenced by Temperature Conditions Alireza Taab Faculty of Natural Resource and Agricultural Sciences Department of Crop Production Ecology Uppsala Doctoral Thesis ...