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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1968.7 kg 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14.83~20.2 mg kg-1,速效钾增加了69.51~109.61 mg kg-1。
The effects of continuous application of P and K fertilizers on yield, nutrient absorption and soil fertility of rapeseed were studied in red-red soil areas of southern Anhui by field experiments. The results showed that the rational application of P and K fertilizers on the basis of applying nitrogen fertilizer promoted the growth and development of rapeseed and increased the nutrient content and nutrient uptake of rapeseed, thus significantly increasing the yield of rapeseed. The yield increase of phosphate fertilizer was greater than that of potassium fertilizer , And the average yield of three-season rapeseed was the highest in P90K120, reaching 1968.7 kg hm-2. In the meantime, the continuous application of P and K fertilizer could improve the soil nutrient content and significantly increase the content of available K and available P in soil. Compared with the pre-test soil, 14.83 ~ 20.2 mg kg-1, and available potassium increased 69.51-109.61 mg kg-1.