不同施氮方式对壤质草甸土土壤pH值及全氮磷钾含量的影响

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。

Dynamics of Soil pH, Total N, Total P and Total K on Different Nitrogen Application in Loamy Meadow Soils of Maize

This test measured the top soil pH, the total N, the total P and the total K before and after winter and analyzed the optimal reduction of nitrogen, the straw gentle application and the controlled release urea on soil pH, total P and total K trends. The results showed that the role of seasonal freezing and thawing, rain and snow in winter can improve the top soil pH, lower nitrogen content of top soil. Because of secreted K⁺ from root system and mineralization, total K of top soil increases. Straw can increase the effectiveness and mobility of P and K to improve the capacity of the soil for fertilizer, promote the absorption of nutrients of maize. Controlled release urea can continue to reduce the top soil pH, grow phosphorus absorption of maize.