陇西河流域水稻平衡施肥对土壤氮磷钾养分的影响研究

Effect of Balanced Fertilization of Rice on the Content of NPK in Soil in Longxi River Basin

采用"3414"二次回归最优设计方案,研究了陇西河流域水稻平衡施肥对土壤氮、磷、钾养分变化的影响。结果表明,水稻种植后,各处理土壤碱解氮、速效钾含量均有不同程度地提高;土壤全磷含量不同程度地降低,而土壤速效磷含量变化差异较大;大多数处理土壤全氮含量不同程度地降低;土壤碱解氮、速效磷、速效钾的含量分别与施氮量、施磷量、施钾量呈极显著正相关。同时,随着施氮量的增加,土壤速效磷的含量也随之增加。

＂3414＂ optimal design of quadratic regression test program was adopted to study the effect of balanced fertilization of rice on the contents of N,P and K in soil,in order to provide a reliable theoretical foundation to maintain soil fertility,control and prevent the area-source pollution in Longxi River Basin.The results showed that after planting,the contents of alkali-hydrolyzable nitrogen and available potassium in soil of all the treatments increased to different degrees.The content of total phosphorus in soil decreased to some extent,while the changes of available phosphorus content were greatly different.The total nitrogen content increased in treatments 6,7,8,11 and 12,while decreased in all the other treatments.There were extremely significant positive correlation between the content of alkali-hydrolyzable nitrogen and the nitrogen application amount,the content of available phosphorus and the phosphorus application amount,the content of available potassium and the potassium application amount.Meanwhile,the content of available phosphorus in soil increased with the increasing of nitrogen application.