Document Type : Research Paper

Authors

1 Department of Plant Production, Faculty of Agriculture and Natural Resources, Gonbad Kavous University, Gonbad Kavous, Iran

2 Gonbad Kavous University.

3 Gonbad Kavous University, Iran

4 Golestan Agricultural and Natural Resources Research and Education Center

Abstract

This experiment was 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. In main plots, pure nitrogen were at four levels included 0 (control), 46, 92, and 138 kg/ha of nitrogen from urea fertilizer source), and, planting density was at six levels (150, 225, 300, 375, 450 and 525 seed/m2, respectively, in subplots. The remobilization photosynthetic assimilate separately from leaves, main stem (without leaves), and seedless spike components were examined to study the process of photosynthetic material transfer to seed. The results showed that there were 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 percent) was obtained in the treatment of 138 kg/ha nitrogen and 450 seed/m2. In the first year, the highest remobilization from the plant was 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 treatment, the highest remobilization was observed in the planting density of 300 seeds/m2 (0.345 gr/plant), and then with increasing planting density, the remobilization from the plant was reduced.

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