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Effects of Long-term K Fertilizer Application on the Crop Yield and K Distribution of Soil Aggregates in a Paddy-Upland Rotation System

查看全文 作　　者：Song [1]Meifang;Hu [1]Yitao;Huang [1]Shuai;He [1]Junfeng;Chen [1]Fowen;Zou [2]Jialong;Li [1]Jifu 高影响力作者 机构地区：[1]Engineering Research Center of Ecology and Agricultural Use of Wetland,Ministry of Education/College of Agriculture,Yangtze University;[2]Jingzhou Agricultural Technology Promotion Center高影响力机构 出　　处：《Meteorological and Environmental Research》索引2019年第10卷第1期,共6页高影响力期刊 基　　金：Supported by National Key R&D Projects of the 13thFive-Year Plan of the Ministry of Science and Technology(2017YFD0201900);Young and Middle-aged Talents Project of Hubei Provincial Department of Education(Q20181303);Construction Project of National Modern Agricultural Industry Technology System(CAR-13) 摘　　要：[Objective]A long-term paddy-upland experiment was conducted to evaluate the effects of the recommended amount of potassium( K)fertilizer on crop yield,distribution of soil aggregate,and soil available K content. It was mainly to ascertain the distribution of K in the soil aggregate components in the paddy-upland rotation system,and then to provide theoretical basis for soil structure improvement,K pool management,and reasonable application of K fertilizer. [Method]There were 2 treatments selected,namely,NP(-K) treatment and NPK( + K) treatment in this study. Then the effects of K fertilizer application on the yield,available K content,and aggregate distribution in the middle rice-winter rape rotation system were analyzed. [Result]The results showed that the output of the crop rotation was affected by the year and fertilization. Compared with NP(-K),the average yield increases of rice and winter rape after application of K fertilizer were 0.51 and 0.33 t/hm2,with the increments of 7.5%and 14. 1% respectively. The long-term application of K fertilizer( 7 a) had no significant effects on the distribution of soil aggregates but could significantly increase the water-soluble K content and available K content at depths of 20-30 and 30-40 cm,and available K content of aggregates in each particle size. In addition,the balance of available K at the 10-20 and 30-40 cm of soil layers was the most significant through calculation of surplus-deficit value of available K in agglomerates of different soil layers. [Conclusion]Compared with the initial available K content in the farmland in 2011,the current K fertilizer application could lead to that farmland K content continues to decline. Therefore,we should pay attention to straw returned and supplement of organic K fertilizer,to maintain crop rotation system's productivity and soil K balance. 关 键 词：Paddy-upland rotation POTASSIUM (K) FERTILIZER Yield Soil AGGREGATE Available K content
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