有机肥料在半干旱条件下的腐解残留特点

施用有机肥料是改良土壤、净化环境、提高农作物产量、改善农产品品质的重要措施。本试验采用砂滤管法研究了６种有机物料在新、老菜园土壤中的腐解状况，以了解土壤中有机质的积累规律，探讨有机肥料对土壤的培肥效果。研究结果表明，麦秸、稻草、沼气渣肥、人粪尿堆肥等是增加土壤有机质的较好物料；对Ｃ／Ｎ比较高的物料，当增加Ｎ素、调节Ｃ／Ｎ比时，可以促进有机碳的分解和向腐殖质的转化；肥力较高的老菜园土壤更有利于有机碳素的腐殖质化和在土壤中的积累

Properties of Decomposition of Organic Fertilizer under the Condition of Semiarid Region

Porous carborundum tubes were used to determine the decomposition of 6 kinds of organic fertilizer at 2 varied fertility of vegetable soils for 6 and 12 months respectevely.Results showed that the rate of decomposition residue of organic carbon were in order of city waste 77.1%,residue of marsh gas 57.2%,compost of rejectments 41.2%,solid manure 35.0%,rice straw 26.5%,wheat straw 24.1%,respectevely.Of which the rice and wheat straw,residue of marsh gas,compost of rejectments were better materials to improve soil organism but city waste.Adjusting the ratio of C/N of organic materials to 25∶1 could increas the rate of residue decomposition in soil.It was found to be useful for decomposition and accumulation of organic cabon in old vegetable soils.