不同绿肥翻压处理对南方稻田土壤速效养分的影响

Effects of Different Green Manure Treatments on Rice Field Soil Available Nutrients

摘要: 采用网袋法模拟绿肥翻压，并结合室内试验分析方式，研究不同绿肥翻压处理在南方水田中活性有机炭、碱解氮、速效磷、速效钾等速效养分释放特征，探讨绿肥腐解过程中对土壤肥力的影响，从而筛选出适合南方水田发展的绿肥翻压方案。在70 d试验周期内，7种不同绿肥翻压处理均能提高土壤活性有机碳、碱解氮、速效磷、速效钾含量。试验结束即翻压70 d时：黑麦草1:1箭筈豌豆处理的土壤活性有机碳含量为最佳，提高了44.93%，混合绿肥处理含量略高于单独绿肥处理；碱解氮含量提高最大的是紫花苜蓿处理，提高了5.74%，单独绿肥翻压处理的土壤碱解氮含量显著高于混合绿肥翻压处理；紫云英处理土壤速效钾含量最大，提高了28.88%。

Abstract: In this study, a net bag method combined with indoor laboratory analysis methods, was used to simulate the return of green manure, study the release characteristics of active organic carbon, alkali-hydrolyzed nitrogen, available phosphorus, and available potassium in southern paddy fields, as well as research the impact of soil fertility, so as to select a green manure return program suitable for the development of southern paddy fields. During this experiment, all could increase active organic carbon, alkali-hydrolyzed nitrogen, available phosphorus, and available potassium. In the end, green manure returned to field for 70 d: the soil active organic carbon content treatment was best to increase the rye grass 1:1 arrowhead peas by 44.93%; the effects of green manure mixture were better than those of green manure alone; alkali-nitrogen content increased the most by the treatment of alfalfa, about 5.74%; the content of green manure mixture was lower than that of green manure alone; the contents of available potassium in the soil treated with V. vulgaris were the highest and increased by 28.88%.