Document Type : Research Paper
Authors
1
Former M.Sc. Student of Department of Plant Production and Genetics, Faculty of Agriculture, Urmia University, Iran
2
Department of Plant Production and Genetics, Faculty of Agriculture, Urmia University, Urmia-Iran.
3
Department of Production Engineering and Plant Genetics, Faculty of Agriculture, Lorestan University, Khorramabad-Iran
10.22034/saps.2025.67855.3376
Abstract
Introduction and purpose: Water deficit stress is one of the most important factors in reducing crop yields. Irrigation and nitrogen distribution can be effective in mitigating of water deficit stress. In light of this, the purpose of this study was to assess the impact of fertilizer partitioning of urea and ammonium sulfate at various phases of plant growth on the morphological traits of wheat under ideal irrigation and water deficiency stress circumstances.
Materials and Methods: In order to study the effect of nitrogen fertilizer partitioning and irrigation on morphological characteristics, remobilization process, and wheat grain filling components, an experiment was conducted as a split factorial in randomized complete block design with three replications in 2022 at Salmas County.
Results: Results showed that water deficit stress caused a 7.1% reduction in grain yield, 8.7% in biological yield, 1.2% in 100-grain weight, and grain filling components (rate grain filling, effective grain filling period and grain weight), while it increased the remobilization from shoot organs and stem and their contribution to grain yield by 8.6%, 49.8%, 29.9%, and 78.1%, respectively. The use of ammonium sulfate and combination of urea and ammonium sulfate, as opposed to separate use of urea, and the three and four stage fertilizers division, versus their two stage division, increased yield, yield components, and grain filling components.
Conclusion: Based on these findings, combining and splitting urea and ammonium sulfate fertilizers in three or four phases can effectively mitigate the negative effects of drought stress on grain filling and wheat yield.
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