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试验测定越冬前后耕层土壤的pH值、全氮、全磷和全钾的变化,分析氮素优化减量、秸秆还田和缓控释尿素的应用对耕层土壤pH值和全氮磷钾的变化趋势。结果表明,季节性冻融和冬季雨雪作用能够提高耕层土壤的pH值,降低耕层土壤的氮素含量,由于玉米根系分泌钾和微生物矿化的双重作用,耕层土壤全钾含量有明显增加;秸秆还田能够提高氮磷钾的有效性和流动性,改善土壤供肥能力,促进玉米吸收养分;缓控释尿素能够持续降低耕层土壤的pH值,促进磷素的吸收。
The changes of soil pH, total nitrogen, total phosphorus and total potassium before and after winter overwintering were measured. The effects of nitrogen optimum reduction, straw returning and controlled-release urea on soil pH and total nitrogen, Trend. The results showed that seasonal freezing and thawing and snow and snow in winter could increase the pH of the topsoil and decrease the nitrogen content of the topsoil. Because of the dual effects of potassium secretion and microbial mineralization, the total potassium content in the topsoil Significantly increased; straw returning to improve the effectiveness of nitrogen, phosphorus and potassium and liquidity, improve soil fertility, promote maize nutrient absorption; slow release of urea can continue to reduce the pH of the topsoil, and promote the absorption of phosphorus.