Effect of super absorbent polymer on growth, yield components and seed yield of wheat grown under irrigation withholding at different growth stages.

摘要

The hydrogel amendments may improve seedling growth and establishment by increasing water retention capacity of soils and regulation of plants available water supplies, especially under arid environments. This study was conducted to evaluate the role of super absorbent polymer use in wheat grown under normal and limited irrigation. An experiment was conducted in research field of Islamic Azad University, Varamin Branch during 2011 growing season. The experimental design was laid out in a randomized complete block with a split plots arrangement of treatments in three replications. Main plots included four different levels of irrigation (complete irrigation or no irrigation withholding, irrigation withholding at stem elongation, irrigation withholding at flowering, and irrigation withholding at both stem elongation and seed setting stages) and sub-factors included super absorbent (0, 20 and 40 kg per hectare). The results showed that irrigation withholding conditions in different growth stages significantly decreased seed yield, carbohydrate grain content and total chlorophyll content but increased protein percentage. Super absorbent polymer application in irrigation withholding in different growth stages had positive effect on all attributes except for protein percentage. In general, it was concluded that super absorbent could improve growth conditions for wheat plants grown under water deficit stress. The reviews although show that super absorbent is able to reduce the destroying effect of low water by absorbing and preserving water and approve varying agricultural characters. With attention to increased yield and its components and decreasing plant water need, using this material is economically acceptable.