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就长期肥料田间试验的红壤性水稻土、黄棕壤性水稻土和灰潮土性水稻土 ,用热力学平衡吸附法和流动法分别进行了土壤钾、磷、锌的吸附 解吸试验和土壤钾吸附动力学试验 ,测定了土壤的粘粒矿物组成、基本性质和有效钾、磷的含量 ,研究了稻草还田对土壤钾、磷、锌吸附量、吸附钾、磷、锌解吸率的影响。结果表明稻草还田 :( 1 )能减小土壤对钾的吸附 ,增加其解吸率 ,提高土壤有效钾量和土壤对钾的缓冲能力 ;( 2 )有利于减少土壤对磷的吸附量 ,增加其解吸率 ,提高土壤磷的有效性 ;( 3 )提高土壤特别是石灰性土壤锌的有效性
The red soil paddy soil, yellow brown paddy soil and gray tidal paddy soil under long-term fertilizer field experiment were used to study the adsorption and desorption of potassium, phosphorus and zinc and the adsorption of soil potassium by thermodynamic equilibrium adsorption and flow method respectively Kinetic experiments were conducted to determine the composition, basic properties and available potassium and phosphorus contents of soil clay. The effects of rice straw returning to soil on the sorption capacity of potassium, phosphorus and zinc and the desorption rates of potassium, phosphorus and zinc were studied. The results showed that: straw can reduce soil adsorption of potassium, increase its desorption rate and increase soil available potassium and soil buffer capacity of potassium; (2) It is beneficial to reduce soil phosphorus adsorption, increase Its desorption rate, increase the effectiveness of soil phosphorus; (3) to improve soil, especially calcareous soil zinc availability