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为明确大豆结瘤和生长对氮、磷肥的响应规律,利用温室盆栽试验,在3种氮浓度(0,200和500 mg·kg-1)和3种P2O5浓度(0,200和500 mg·kg-1)组合条件下,测定了大豆根瘤数、根瘤量、株高、地上部生物量、地下部生物量和荚数的变化。结果表明:500 mg·kg-1的施氮量显著抑制结瘤,磷肥可以促进结瘤并缓解氮肥对结瘤的抑制。适当的氮磷比例促进大豆生长,施200 mg·kg-1N和500 mg·kg-1P2O5时,大豆的地上部生物量和荚数均最大;不施磷只施500 mg·kg-1N时大豆地下部生物量最大。综上所述,200 mg·kg-1P2O5对大豆结瘤和生长均有促进作用;维持较高大豆产量和较高结瘤能力所需的氮肥用量是不能同步的。
In order to clarify the response of nitrogen and phosphate fertilizer to the nodulation and growth of soybean, pot experiments were conducted under three nitrogen concentrations (0, 200 and 500 mg · kg -1) and three concentrations of P 2 O 5 (0, 200 and 500 mg · kg -1) Under the combined conditions, the changes of nodule number, nodule number, plant height, aboveground biomass, underground biomass and pods were determined. The results showed that nitrogen application at 500 mg · kg-1 significantly inhibited nodulation. Phosphate fertilizer could promote nodulation and alleviate the inhibition of nitrogen fertilizer on nodulation. The appropriate proportion of nitrogen and phosphorus could promote the growth of soybean. When applying 200 mg · kg-1N and 500 mg · kg-1P2O5, the aboveground biomass and pods of soybean were the highest. When applying 500 mg · kg- The largest underground biomass. Taken together, 200 mg · kg -1 P 2 O 5 promoted the nodulation and growth of soybean, and the amount of nitrogen needed to maintain higher soybean yield and higher nodulation capacity could not be synchronized.