不同施肥模式下潮棕壤稻田的速效养分状况和水稻的养分分配

研究了不同施肥模式下下辽河平原潮棕壤稻田土壤速效养分的供应能力及水稻的养分分配.结果表明:各处理0～20 cm速效养分供应能力均高于20～40 cm,其变异也大于20～40 cm(速效氮除外);有机、无机肥相结合有利于提高土壤速效养分的供应能力;水稻氮和磷的分配主要集中在籽实中,钾的分配则主要集中在秸秆中.采用秸秆还田措施有利于缓解钾肥资源的不足,保持钾素的循环再利用,维持土壤钾库,减少钾肥投入,降低农业生产成本,减轻环境污染.

Effects of different fertilization patterns on nutrient supply of aquic brown soil rice field and nutrient allocation in rice plant

A field experiment was conducted on an aquic brown soil rice field in the lower reach of Liaohe River plain to study the effects of different fertilizations on soil nutrient supply and rice plant nutrient allocation. The results showed that under fertilization, the capability of nutrient supply and the quantitative variation of available nutrients except N were higher and greater in 0-20 cm than in 20-40 cm soil layer. A combined application of inorganic and organic fertilizers was more beneficial to the enhancement of soil nutrient supply. The absorbed N and P by rice plant were mainly allocated in rice grain, while absorbed K was mainly in the stalk. Returning rice stalk into field could relax soil K shortage, maintain soil K pool, decrease K input, and reduce agricultural production cost or mitigate environmental pollution.