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大豆施用磷钾肥,如用量合适,能刺激大豆根瘤生长,从而达到增产目的。据试验,在粘壤土上,每亩施18斤磷肥(P_2O_5)、18斤钾肥,则根瘤数较对照增加22％,根瘤鲜重增加393％。大豆亩产526斤。
Soybean phosphorus and potassium fertilizers, such as the amount of suitable, can stimulate the growth of soybean nodules, so as to achieve the purpose of stimulation. According to the test, on the clay loam soil, 18 kg P fertilizer and 20 kg P fertilizer per acre increased the number of nodules by 22% and the fresh weight of nodules by 393%. Soybean yield 526 pounds.