%0 Journal Article
%T Study on Effects of Potassium(K)Fertilizer on Rice and K Balance of Paddy Fields in Different Types of Ecoregions of Hubei Province<br>湖北省两个生态区水稻施钾效果及农田钾素平衡研究
%A WANG Ya-yi
%A LU Jian-wei
%A XIAO Rong-ying
%A LI Xiao-kun
%A <br>王亚艺
%A 鲁剑巍
%A 肖荣英
%A 李小坤
%J 土壤
%D 2010
%I 
%X Two field experiments of rice were conducted to study the effects of potassium (K) fertilizer on rice yield, economic profit, K utilization rate and on the field K balance in hilly ecoregion of southeastern Hubei and Jianghan Plain ecoregion. The results showed that K fertilizer increased obviously rice yield and economic profits in the two ecoregions, rice yield in Jianghan Plain increased with the increase of K utilization rate and the highest increased yield was 3 007 kg/hm2 with net economic profit of 4 136 Yuan/ hm2 under 187.5 kg/hm2 application of K2O. Rice yield in southeastern Hubei increased significantly with K fertilization but no significant differences among different rates of K fertilization, 150 kg/hm2 application of K2O obtained the highest increased rice yield (1 495 kg/hm2) with net economic profit (1 852Yuan/ hm2). The average K utilization rate in Jianghan Plain was 74.6%, which was lower than that (98.7%) in hilly ecoregion of southeastern Hubei. The result also found the negative K balances in the two ecoregions after rice growing, which could be relieved by K fertilizer application.
%K Ecosystem areas
%K Rice
%K Yield
%K K use efficiency
%K K balance<br>不同生态区
%K 水稻
%K 产量
%K 钾肥效应
%K 钾素平衡
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=03F54A49DE00578AA0E5DDF5BC021AA7&cid=1A8B5357F0EF07B8&jid=56F69E970C6E5190CDB409D28DD0E3C6&aid=21003DFC9213150D1E38457CE1E800EF&yid=140ECF96957D60B2&vid=ECE8E54D6034F642&iid=38B194292C032A66&sid=8143FF92EEF26F96&eid=A94616C4391AA5EF&journal_id=0253-9829&journal_name=土壤&referenced_num=0&reference_num=15