冷凉地区不同秸秆还田量对土壤营养的影响

Effect of Different Straw Returning to Soil Nutrition in Cold Area

2016年至2018年在青海省西宁市湟中县良种繁殖场进行单因素随机区组设计秸秆还田试验。研究不同秸秆还田量对土壤营养的影响。结果表明:在每公顷秸秆还田量24750kg以下时,随着秸秆量的增多,前期腐熟速率也在增快,但最终秸秆剩余量基本相同;秸秆还田量对土壤营养指标(有机质、全N、全P_2O_5、全K_2O、碱解N、有效P、速效K、pH、下茬作物蚕豆的产量)都有不同程度的影响,随着秸秆还田量的增加,土壤pH逐渐下降,并且下降程度先增大后基本不变;随着秸秆量的增加,下茬作物蚕豆的产量、土壤的有机质、全N、全P_2O_5、全K_2O、碱解N、有效P、速效K都有不同程度的提高。秸秆还田能够改善土壤营养条件。

From 2016 to 2018,a single factor stochastic area was designed to design straw returning field in Huangzhong County,Xining City,Qinghai Province.The effects of different straw returning to field on soil nutrition were studied. The results showed that when the amount of straw per hectare was less than 24750 kg,the early rotting rate increased rapidly with the increase of straw volume,but the final amount of straw was basically the same,and the amount of straw returning to the field was the same as that of soil nutrition index(organic matter,total N,total P2O5,full K2O,alkaline solution N,effective P,pH,The yield of broad bean of lower stubble crops) has different degrees of influence,with the increase of straw returning to the field,the soil pH decreases gradually,and the degree of decline increases first and then remains basically unchanged,and with the increase of straw volume,the yield of broad bean,soil organic matter,total N,whole P2O5,whole K2O,alkaline solution N,effective P,The quick-impact K has been improved to varying degrees. Straw returning to the field can improve soil nutritional conditions.