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氮肥运筹和磷钾肥初花期追施试验表明:适量的氮磷钾肥后移不仅能提高大豆产量,且有一定的经济效益。增产幅度和效益是氮肥后移>磷肥后移>钾肥后移。氮肥追施适宜比例为50%左右,宜初花期一次追施或初花期、鼓粒期二次追施;30%以上的磷钾肥可后移至初花期追施。生产上应提倡氮肥后移,在基施磷钾肥不足时还应追施磷钾肥。
Nitrogen fertilizer application and topdressing experiments of P and K at the first flowering stage showed that proper amount of N, P and K fertilizer could not only increase soybean yield but also have certain economic benefits. Yield and efficiency of nitrogen fertilizer is the shift> phosphate fertilizer shift> potash fertilizer shift. Nitrogen topdressing the appropriate proportion of about 50%, a flowering or flowering early flowering stage, drum second chasing times; more than 30% of P and K can be moved back to the early flowering chase. Nitrogen fertilizer should be promoted after the shift in the production of phosphorus in the infrastructure should also be topdressing phosphorus and potassium fertilizer.