Hamidreza Sarli; Abbas Biabani; Hossein Sabouri; Rahmatolah Mohammadi
Abstract
This experiment has been performed to study the effect of seed sowing density and different amounts of nitrogen fertilizer application on the remobilization indices in wheat (Qaboos cultivar) in the field of Gonbad Kavous Agricultural and Natural Resources Research Station in two years (2018-19 and 2019-20) ...
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This experiment has been performed to study the effect of seed sowing density and different amounts of nitrogen fertilizer application on the remobilization indices in wheat (Qaboos cultivar) in the field of Gonbad Kavous Agricultural and Natural Resources Research Station in two years (2018-19 and 2019-20) in three replications and as a split-plot in a randomized complete block design. The main plots include pure nitrogen at four levels, i.e., 0 (control), 46, 92, and 138 kg/ha of nitrogen from urea fertilizer source), and the subplots are planting density at six levels (150, 225, 300, 375, 450, and 525 seed/m2). The remobilization photosynthetic assimilate separately from leaves, main stem (without leaves), and seedless spike components are examined to study the process of photosynthetic material transfer to seed. Results show that there has been significant differences among planting density, nitrogen fertilizer, and interaction of planting density× fertilizer treatments in terms of grain nitrogen percentage and remobilization traits of wheat. The highest percentage of grain nitrogen (1.87%) has been obtained in the treatment of 138 kg/ha nitrogen and 450 seed/m2. In the first year, the highest remobilization from the plant is observed in the treatment of 92 kg/ha nitrogen and 375 seeds/m2 (0.528 gr/plant), and in the second year, in the control, the highest remobilization is observed in the planting density of 300 seeds/m2 (0.345 gr/plant), and then with increasing planting density, the remobilization from the plant is reduced.
Farideh Akbari; Mehdi Dahmardeh; Ali Morshdi; Ahmad Ghanbari; Soror Khoramdel
Abstract
In order to investigate the N uptake and N utilization efficiency and nitrogen harvest index in corn and bean intercropping under the influence of tillage systems and residues of wheat an experiment was performed using split- split plots based on a randomized complete block design with three replications ...
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In order to investigate the N uptake and N utilization efficiency and nitrogen harvest index in corn and bean intercropping under the influence of tillage systems and residues of wheat an experiment was performed using split- split plots based on a randomized complete block design with three replications in agricultural research field of Shahrekord during growing season of 2016–2017. The tillage systems with three levels (conventional, minimum, and no tillage) and four levels of crop residue (0, 30, 60, and 90% of straw yield of wheat) and five intercropping patterns including corn monoculture, bean monoculture, corn and bean ratio with 2:2, 3:1 and 1:3 were considered as main, sub and sub-sub plots, respectively. The results showed that the highest nitrogen content in seed and biomass of both crops under conditions of use of 60% of plant residues, no- tillage systems and their monocultures. Agronomic use nitrogen efficiency in intercropping was lower than their monocultures. The highest N utilization efficiency was obtained in 3: 1 and 2: 2, indicating a clear superiority of intercropping than monoculture. Therefore, intercropping corn and bean can improve the nitrogen utilization efficiency. By decreasing nitrogen fertilizer application, it can play an important role in the long-term sustainability of agro-ecosystems production.