[Objectives]This paper aimed to clarify the change of nutrient content in Leguminous green manure crops and its impact on soil fertility with none extra chemical fertilizer.[Methods]The experiments were conducted to study the growth and development of four Leguminous green manure crops from October 2021 to May 2022 in field.They were Chinese milk vetch(Astragalus sinicus L.),hairy vetch(Vicia villosa Roth.),broad bean(Vicia faba L.)and common vetch(Vicia sativa L.),respectively.The nutrient contents of nitrogen(N),phosphorus(P)and potassium(K)in green manure crops as well as the soil nutrient content were measured.[Results]The changes in N,P,K nutrient content of different Leguminous green manure crops during the seedling stage and later growth stage were similar.Four Leguminous green manure crops had significantly higher nutrient content at the later growth stage than at the seedling stage,with biomass of dry weight of over 1 800 kg·hm-2,making them suitable for flipping.In later growth period,the total N content(3.34％)and total P content(0.29％)of hairy vetch were significantly higher than the others,while the total K content of Chinese milk vetch(3.58％)was the highest and the difference displayed a significant level.The accumulation of N,P and K nutrients in Chinese milk vetch and hairy vetch was relatively high,while that in broad bean and common vetch was relatively low.The pH value of soil did not change with green manure application.After growing Leguminous green manure,the organic carbon content in soil as well as total N,available P and available K contents increased,with a range of 2.71％-29.50％.Among them,the application of Chinese milk vetch to the field could significantly improve soil fertility,and the organic carbon,total N,available P and available K contents increased by 4.04％,3.40％,29.50％and 8.22％compared to fallow cultivation,respectively.[Conclusions]Under the condition of disappeared application of chemical fertilizer,Chinese milk vetch was conducive to improving soil fertility.
Leguminous green manurenutrient contentsoil fertilitynutrient substitution
维普
万方数据
