%0 Journal Article
%T K fertility and K deficit index of aquic brown soil under different fertilization systems<br>不同施肥制度下潮棕壤钾素肥力变化和土壤缺钾指标
%A YU Wan-tai
%A JIANG Zi-shao
%A SHEN Shan-min
%A ZHANG Lu
%A <br>宇万太
%A 姜子绍
%A 沈善敏
%A 张璐
%J 应用生态学报
%D 2007
%I 
%X 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 x kg(-1).
%K fertilization
%K soil fertility
%K index of K deficit<br>施肥
%K 土壤肥力
%K 缺钾指标
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=42FEDDFE54F8BCD9D5FD1926ABDD7722&aid=FBE0DC6758C4CA12&yid=A732AF04DDA03BB3&vid=13553B2D12F347E8&iid=F3090AE9B60B7ED1&sid=7A4D490451ECA9E5&eid=2C502C9A2A834A49&journal_id=1001-9332&journal_name=应用生态学报&referenced_num=0&reference_num=17