皖南红黄壤地区连续施用磷钾肥对油菜产量、养分吸收及土壤肥力的影响

Effect of Continuous Application of Phosphorus and Potassium Fertilizer on the Yield and Nutrient Uptake of Rapeseed and Soil Fertility in South Anhui

在皖南红黄壤地区利用大田试验研究了连续施用磷钾肥对油菜产量、养分吸收和土壤肥力的影响。结果表明：在施用氮肥的基础上合理配施磷钾肥，促进了油菜的生长发育，提高了油菜植株的养分含量和养分吸收量，从而显著增加了油菜的产量，并且磷肥的增产效应大于钾肥效应，三季油菜平均产量以处理P90K120最高，达到了1968．7kg hm^-2；同时连续施用磷钾肥能够改善土壤养分含量，显著提高了土壤速效钾、速效磷含量，与试验前土壤相比，速效磷增加了14．83—20．2mg kg^-1，速效钾增加了69．51—109．61mgkg^-1。

The effect of phosphorus and potassium fertilizer on the yield and nutrient uptake of rapeseed and soil fertility was studied. The result showed that the application of phosphorus and potassium fertilizer combined with nitrogen fertilizer could promote the growth of rapeseed and increase the nurtient content and nutrient uptake. So the yield of rapeseed increased remarkably. The effect of phosphorus fertilizer on the yield was greater than that of potassium fertilizer. The application of phosphorus and potassium fertilizer could also improve the soil nutrient content.