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为了探索钾肥对大豆的增产效果,从1977年开始,对大豆进行了一系列的施肥试验.试验表明,大豆增施钾肥,具有明显的增产效果,1977年以每亩施硫铵40斤,过磷酸钙50斤,钾肥20斤,菌肥一管拌种,获得亩产量370.5斤,比对照增产51.8斤.同时对大豆不同生育期体内速效养分进行了营养诊断,其N、P、K比例是O.5-O.7∶1∶2.7-5.
In order to explore the effect of potash fertilizer on the soybean yield, a series of fertilization experiments on soybean were carried out from 1977. The experiment shows that the increase of potash fertilizer by soybean has obvious yield increase effect. In 1977, 40 kg of ammonium sulfate per acre 50 kg of calcium phosphate, 20 kg of potash fertilizer, a tube of seed dressing, obtaining a yield of 370.5 kg, yielding 51.8 kg more than the control.At the same time, the nutritive diagnosis of available nutrients in different growth stages of soybean was carried out. The proportions of N, P and K were O.5-O.7: 1: 2.7-5.