不同施肥处理对连作大豆白浆土中氮素形态的影响

Effect of Different Fertilizations on the Forms of Nitrogen in Soybean Successive Planting

试验结果表明,连作大豆长期不施肥和单施氮、磷化肥,白浆土中各形态氮素呈下降趋势,其中氨基酸态氮减少最多,10年间分别降低了148.00%和60.00%。长期施用有机肥和大豆秸秆还田,不仅增加连作大豆白浆土中各形态氮含量,而且改变了土壤氮素组成。

The research showed that the contents of each form of nitrogen descended in Ablic soil with no fertilization and only application nitrogen and phosphorus chemical fertilizer in soybean successive planting. The reduction of amino-acid nitrogen was maximum, and the contents of amino-acid nitrogen with no fertilization and only application nitrogen and phosphorus chemical fertilizer were reduced 148.00% and 66.00% respectively for last ten years. The each form of nitrogen not only was increased with long term application organic fertilizer and soybean straw ploughing under, but also nitrogen fraction was changed.