| Study on effect of long-term application of K fertilizer and returning straw to soil on soil nutrient and wheat yield in the region of castanozem |
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| DOI：10.7606/j.issn.1000-7601.2009.02.36 |
| Key Words: application of K fertilizer returning wheat straw to soil soil nutrient wheat yield long-term effect |
| Author Name | Affiliation | | TAN Deshui | Soil and Fertilizer Institute Shandong Academy of Agricultural Sciences,Jinan,Shandong 250100,China | | JIN Jiyun | Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences,Beijing 100081,China | | HUANG Shaowen | Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences,Beijing 100081,China | | CHEN Zhanquan | Soil and Fertilizer Institute Qinghai Academy of Agricultural and Forestry Sciences,Xining,Qinghai 810016,China |
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| Abstract: |
| Effect of application of K fertilizer and returning wheat straw to soil for continuous 14 years on soil potassium of 0～20 cm depth and other soil nutrient index and wheat yield in the region of castanozem in northwestern Qinghai was studied.The results showed that the content of available K, slowly available K and total K in treatments of K fertilizer application or straw returning were higher than that in NP treatment, and the content of three kinds of potassium showed significant difference between treatments of NPK+St and NP, K fertilizer and straw could improve the proportion of available K and slowly available K, however reduce the proportion of mineral K;Compared with the beginning of the experiment, the content of available K in treatments of NPK and NPK+St and slowly available K in treatment of NPK+St was higher than that in original soil separately, and others showed the contrary;The consumption of soil K was more serious, which could consume more than 175.5 kg/hm2 K2O annually, and except for treatment NPK+St, soil K was deficient in each treatment of the fixed site;Long-term application of K fertilizer and returning straw to soil could reduce the content of NH4+-N, available S, available Ca, available Mg and total P, however increase the content of organic matter, available P, available Cu, available Fe, available Mn, available Zn and total N, and their change degrees were different;During 14 years, wheat yield had no relations with application of K fertilizer and returning wheat straw to soil, and yield showed no significant difference between treatments. |
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