摘要
通过在潮棕壤上进行的15年定位试验研究了不同施肥制度下钾素肥力变化和土壤缺钾指标.结果表明:不施钾肥处理加剧了土壤钾素的消耗,土壤速效钾和缓效钾浓度均有不同程度的下降;单施钾肥处理不能维持土壤钾素平衡,土壤中速效钾和缓效钾浓度仍有下降趋势;循环堆肥处理可在一定程度上补偿土壤钾的支出,但需配施钾肥;循环堆肥和钾肥配施处理土壤速效钾和缓效钾浓度基本保持不变.根据历年试验结果进行统计分析表明,用十字交叉法得出的玉米和大豆土壤速效钾临界值均为73mg.kg-1.
A 15-year fertilization experiment was conducted on an aquic brown soil to study the variations of its K fertility and the index of K deficit under different fertilization systems. The results indicated that no K application accelerated the depletion of soil K, representing a certain decrease of soil available and slow-release K. Applying K alone could not keep soil K in balance, still having a decrease of soil available and slow-release K. The application of recycled compost combined with appropriate amount of fertilizer K could compensate soil K expenditure to a certain degree, and keep the concentrations of soil available and slow-release K somewhat constant. The statistic analysis on the past years test results showed that the critical values of soil available K in corn- and soybean fields obtained by crossing method were all 73 mg · kg^-1.
出处
《应用生态学报》
CAS
CSCD
北大核心
2007年第10期2239-2244,共6页
Chinese Journal of Applied Ecology
基金
中国科学院野外台站基金项目
中国科学院知识创新工程重要方向项目(KZCX3-SW-433)
中国科学院沈阳应用生态研究所海外留学基金资助项目.
关键词
施肥
土壤肥力
缺钾指标
fertilization
soil fertility
index of K deficit.
作者简介
通讯作者．宇万太，男，1964年生，研究员．主要从事农业生态系统物质循环研究，发表论文50余篇．E-mail：wtyu@iae．ac．cn
