不同前茬对大豆生长发育及体内常量元素含量的影响

Effect of Different Fore crop on Growth and Development and Macro element Content in Soybean

在玉米、小麦、大豆、苜蓿茬的同类土壤上种植大豆，并于大豆盛花、末花、结荚、鼓粒期取样测定其株高、干重，同时测试大豆植株体内氮、磷、钾、钙、镁的含量，大豆成熟后实收计产并测试子粒中常量元素的含量。试验结果，重茬大豆生产发育不良，营养代谢紊乱，前期钙、镁过量吸收并与磷、钾的含量呈负相关。植株生长后期钙吸收锐减，子粒中磷、钾、钙、镁的含量显著低于其它茬口的大豆，产量降低。

Soybean [Glycine max (L.)] was grown in the same kind of soil with maize, wheat, soybean and alfalfa respectively, and plant height and dry weight of soybean were determined in full blooming, last flowering, podding and seed filling, in the meanwhile, the content of nitrogen, phosphorus, potassium, calcium and magnesium in soybean plant was also determined. The yield was computed by actual harvesting and the macro elements content in soybean seeds was determined after maturing. The results showed that soybean following soybean grew poor, and nutrient metabolism was disorder. Calcium and magnesium were overabsorbed and negatively correlated with phosphorus and potassium contents in earlier stage. The calcium absorbed by the plant of soybean following soybean was sharp reduced in late growing stage. The contents of phosphorus, potassium, calcium and magnesium in seeds were significantly lower than those of soybean with other fore crops. The yield of soybean following soybean reduced. The change of nitrogen content in plant and seed of soybean with different fore crops was not significant.