硝酸磷肥水溶磷含量对小麦营养效应研究

EFFECTS OF WATER SOLUBLE PHOSPHORUS CONTENT OF NITROPHOSPHATE ON WHEET NUTRITION

在中性、钙质、酸性紫色土上研究硝酸磷肥和重过磷酸钙水溶磷含量对小麦产量和养分吸收的影响。结果表明，在３种紫色土上施硝酸磷肥都显著地提高了小麦产量。重过磷酸钙在中性和钙质紫色土上与硝酸磷肥相当，在酸性土上不如硝酸磷肥。在中性、钙质、酸性土上施用硝酸磷肥的适宜水溶磷含量分别为３０％～１００％，≥８３％，≤３０％。随着肥料中水溶磷升高，小麦植株含磷量增加，在钙质土上，小麦产量与水溶磷含量呈直线正相关，土壤中有效磷残留量降低。在中性土上，小麦产量与土壤中有效磷残留量无明显变化。在酸性土上，小麦产量随水溶磷含量增加而下降，土壤有效磷残留量变化不大。肥料中磷素的残效显著。

A pot experiment,which was used to study on the effects of different water-soluble phosphorus content(WSPC)of nitrophosphate on the yield and nutrient absorption of wheet,was done in three typical purple soils. The results showed that the fit WSPC of ni-trophosphate in wheet was 30～100%in neutral purple soil,>80%in calcareous purplesoil and < 30%in acid purple soil. The phosphorus content of wheet increased with theWSPC of nitrophosphate increasing.The yield of wheet increased when the WSPC of ni-trophosphate increased in calcareous purple soil.But the result was opposite in acid ptirplesoil.