黑土区大豆适宜NPK肥料用量研究

The dosage of NPK fertilizer in soybean at black soil area

通过NPK不同用量的试验 ,阐明目前黑土区大豆生产的适宜用量为每公顷施N 35kg、P2 O530kg、K2 O 2 0kg。施磷配合条件下 ,施氮增产 2 3 5 % ;施氮配合条件下 ,施磷增产 13 7%。尽管大豆本身能够固氮 ,但增施氮肥仍有较好的增产效果。由于磷素的土壤积累 ,磷肥的用量及增产作用已经明显低于 2 0世纪 80年代。大豆产量对土壤的依存率为 73 3%～ 79 0 %。图 3,表7,参 3。

This study indicated that the utilization value of NPK fertilizer were 35kg/hm 2 for N, 30 kg/hm 2 for P 2O 5 and 20 kg/hm 2 for K 2O by the test of different dosage of NPK in soybean at black soil When dosage of P was constant, soybean yield was raised 23 5% by N application; when dosage of N was constant, applied P increase 13 7% Although soybean could fix nitrogen from air, increasing application of N fertilizer was benefit for yield improvement Because, the P was fixed in soil, the utilization value of P fertilizer and the effect of P were less than effect of 1980's The percentage of which soybean yield depend on soil was 73 3%-79 0%