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通过田间试验,利用15N自然丰度法评估了太湖地区两种典型水稻土冬季种植紫云英和蚕豆两种绿肥在生长期的固氮特性、固氮量,研究了磷钾肥对紫云英和蚕豆的生物量、固氮率、固氮量的影响。结果表明,两种土壤上,紫云英和蚕豆固氮率在盛花期最高,固氮量在结荚期最高,此时乌栅土紫云英和蚕豆地上部固氮量分别为54.1 kg hm-2和70.8 kg hm-2,另收获的青蚕豆固氮量为38.1 kg hm-2。施磷钾肥能够提高绿肥的生物量和固氮率,从而提高绿肥的固氮量,施磷钾肥分别提高乌栅土紫云英和蚕豆固氮量3.1%和1.7%,垅泥土则分别为98.5%和37.9%。
The 15N natural abundance method was used to evaluate the nitrogen fixation characteristics and nitrogen fixation of two typical green manures of Astragalus sinicus and Vicia faba in two typical paddy soils in Taihu Lake during growing season. , Nitrogen fixation rate, the amount of nitrogen fixation. The results showed that the nitrogen fixation rate of Astragalus sinicus and broad bean was the highest at full flowering stage and the highest nitrogen fixation was at podding stage. The nitrogen fixation capacity of Astragalus sinicus and Vicia faba was 54.1 kg hm-2 and 70.8 kg hm-2, and the other nitrogen fixation of broad bean was 38.1 kg hm-2. Phosphorus and potassium fertilizers can increase the biomass and nitrogen fixation rate of green manures and thus increase the nitrogen fixation of green manures. Phosphorus and potassium fertilizers increased the nitrogen fixation by 3.1% and 1.7%, respectively, while the soil with clay and phosphorus increased by 98.5% and 37.9% .