两种磷肥对棉田土壤磷素有效性及吸收分配的影响

通过田间试验研究了两种磷肥不同用量对棉花全生育期磷素有效性和干物质积累的影响。结果表明，增施磷肥能显著的增加棉田土壤速效磷和全磷含量以及磷素活化系数，同时也能增加棉花对磷素的吸收和干物质的积累；两种磷肥比较显示，过磷酸钙对棉田土壤全磷含量、磷素活化系数、干物质积累和吸磷量的贡献与磷酸二铵相差不大，只有对土壤速效磷含量的贡献显著优于磷酸二铵，苗期、蕾期、花铃期和吐絮期棉田土壤的速效磷含量分别是施用磷酸二铵肥料的7．95，4．35，2．81和2．95倍。

Effect of Two Types of Phosphates on Phosphorus Efficiency and Phosphorus Absorption and Distribution in Cotton Field

In this paper, the effect of two types of fertilizer and different phosphorus concentration on phosphorus efficiency and dry matter accumulation in the whole growth period of cotton was studied by field experiment. The results showed that application of phosphorus could significantly increased soil available phosphorus and total phosphorus content as well as phosphorus activation coefficient, but also could increase the phosphorus absorption and dry matter accumulation. Comparison results showed the effect of single super phosphate （SSP） on soil total phosphorus content,phosphorus activation coefficient,dry matter accumulation and phosphorus uptake in cotton field was the same as di-ammonium phosphate （DAP）, only the effect of SSP on soil available phosphorus content was significantly superior to DAP, the soil available phosphorus content of seedling stage, bud period, flowering and bolling stage and boll-opening stage of SSP were respectively 7.95,4.35,2.81 and 2.95 times as big as DAP.