%0 Journal Article
%T Effect of long-term potassium application on irrigated soil potassium and on the yield and nutrient of crops<br>灌淤土区长期施钾对作物产量与养分及土壤钾素的长期效应研究
%A TAN De-Shui
%A JIN Ji-Yun
%A HUANG Shao-Wen
%A LIU Zhao-Hui
%A JIANG Li-Hua
%A <br>谭德水
%A 金继运
%A 黄绍文
%A 刘兆辉
%A 江丽华
%J 中国生态农业学报
%D 2009
%I 
%X An experiment on the long-term application of potassium (K) fertilizer and wheat straw in irrigated soils of Ningxia, northwestern China began in 1993. The objective of the experiment was to determine the effect of K fertilizer application and wheat straw return to soil on crop nutrient content and yield and the status of soil K in plowed soil layers. The results show that K fertilizer and wheat straw increase yield of wheat and maize. K fertilizer treatments increase wheat yield by 244 kg·hm-2 and maize yield by 397 kg·hm-2 annually. The order of all treatments effect on yield is as follows: NPK+straw > NPK > NP+straw > NP. K fertilizer has a significant effect on crop yield when it is continuously applied for 8~10 years. Significant response of yield to K application occurs earlier in maize than in wheat. Furthermore, K fertilizer and wheat straw return to soil increase potassium content in the kernel and straw of the crops. There is a higher potassium content in straw, while it in kernels accounts for only 13%~17% of the total potassium content of plant. Furthermore, K fertilizer enhances the elements contents of kernels and accelerates element absorption by kernels. However, K fertilizer reduces trace- and micro-elements in straw. The content of 0~20 cm soil available K and slowly available K in non-potassium (NP and NP+Straw) treatments for long-term application decrease. Total K content in all treatment declines at a rate of 0.8~1.2 g·kg-1.
%K Long-term K fertilizer application
%K Wheat straw return to soil
%K Crop yield
%K Crop nutrition
%K Soil potassium
%K Irrigated soil<br>长期施钾
%K 秸秆还田
%K 作物产量
%K 作物养分
%K 土壤钾素
%K 灌淤土
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=03F54A49DE00578AA0E5DDF5BC021AA7&cid=1A8B5357F0EF07B8&jid=AB3ABF502E2E1FF39F0E3B80164C9031&aid=5F9EE425EB0004F1E09CD69E20606065&yid=DE12191FBD62783C&vid=BCA2697F357F2001&iid=E158A972A605785F&sid=42FF82ADD37D41AA&eid=E4EC39E73004B593&journal_id=1671-3990&journal_name=中国生态农业学报&referenced_num=0&reference_num=22