论文部分内容阅读
1980年以来连续六年在西宁北郊的定位试验结果表明:在地势高寒、有机质贫乏、氮素匮缺的栗钙土上实行粮肥轮作,隔年三次春播秋翻箭豆绿肥,每次亩压箭豆干物质500—750公斤,可使耕地土壤较试验前基础土有机质含量提高0.05—0.12％,全氮量增加0.009—0.0146％,并增进土壤有机无机复合胶体形成,其增值复合度较同期休闲地提高57.08％,后茬春小麦较休闲地增产13.59—20.99％,具有明显的培肥改土作用与增产效果。绿肥对土壤有机质积累与绿肥的C/N值、化学组成、翻压期、翻压量和水热条件等因素有关,实行粮肥轮作连续翻压,复种豆科绿肥与禾本科绿肥混播或掺合部分C/N值宽的作物秸秆翻压,均有利于有机质积累。
The results of the positioning test in the northern suburb of Xining for six consecutive years since 1980 show that the grain-fat crop rotation is carried out on the chestnut soil with poor terrain, organic matter deficit and nitrogen deficiency. 500-750 kg of dry matter of soya bean can increase soil organic matter content of cultivated soils by 0.05-0.12% and total amount of nitrogen by 0.009-0.0146%, and promote the formation of organic-inorganic colloids in the soil. Compared with the same period of leisure Increased 57.08%, after the spring wheat crop more casual than 13.59-20.99%, with significant effects of fertilization and soil improvement and yield increase. Green manure on the accumulation of soil organic matter and green manure C / N value, chemical composition, turn over pressure, turn over pressure and hydrothermal conditions and other factors, the implementation of continuous rotation of grain and fertilizer pressure round, mixed cropping green manure and gramineous green manure mixed or mixed Co-part C / N wide crop straw pressure, are conducive to the accumulation of organic matter.