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

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

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。

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.