Effect of Applying Different Forms and Rates of Phosphoric Fertilizer on Phosphorus Efficiency and Cotton Yield
In this paper, the effects of two phosphorus fertilizers and their different concentrations on soil, phosphorus efficiency of plant on the whole growth period and yield for cotton were studied by field experiment. The results showed that application of phosphate could significantly increase available phosphorus and total phosphorus content of soil as well as phosphorus activation coefficient, the average contents of soil available phosphorus and phosphorus activation coefficient were 302% and 180% more than those of control, also application phosphate could increase the phosphorus absorption and dry matter accumulation. However, excessive application of phosphate fertilizer could not significantly increase the level of cotton yield, phosphorus absorption and dry matter accumulation. The amount of applying PzOs of obtaining the optimal phosphorus absorption and dry matter accumulation was 150 kg·hm~2. Comparison results showed available phosphorus content, phosphorus activation coefficient and cotton yield of single super phosphate (SSP) were 244% and 325% higher, respeclively, than those of di-ammonium phosphate (DAP).
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