Provincial potassium balance of farmland in China between 1980 and 2010

文献类型： 外文期刊

第一作者： Liu, Yingxia

作者： Liu, Yingxia;Gao, Qiang;Yang, Jingyi;He, Wentian;Ma, Jinchuan;Lei, Qiuliang;He, Ping;Ullah, Sami;Yang, Fuqiang;He, Ping;Wu, Haiyan

作者机构：

关键词： Potassium balance;Chemical fertilizer;Organic manure;Potassium use efficiency;Crops removal

期刊名称：NUTRIENT CYCLING IN AGROECOSYSTEMS （ 影响因子：3.27； 五年影响因子：3.767 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Great changes have been happened over the past 30 years in chemical fertilizer input in China, and thus a gross potassium (K) budget model established to evaluate the variation of farmland K balance for China in 1980 and 2010 at the national scale is important. Results indicated that total K input in 1980 was 6.8 million tonnes, in which chemical fertilizer, organic manure and other sources accounted for 5.6, 77.5 and 16.9% respectively. Total K input in 2010 was 21.6 million tonnes, in which chemical fertilizer, organic manure and other sources accounted for 43.5, 50.4 and 6.1% respectively. Total K output in 1980 was 8.1 million tonnes, in which crops removal and loss accounted for 98.2 and 1.8% respectively. Total K output in 2010 was 19.1 million tonnes, in which crops removal and loss accounted for 99.2 and 0.8%, respectively. Similar to K input, the spatial distribution of K output differed greatly. Total K deficit was 1.3 million tonnes, and the range of K balance in each province was -86.7 to 53.6 kg K2O ha(-1) in 1980. Compared with that, total K surplus was 2.5 million tonnes and the range of K balance in each province was -43.0 to 256.6 kg K2O ha(-1) in 2010. Chemical fertilizer K application over the past 30 years makes the great changes in average K balance from deficit to surplus in general; however, the great spatial variation in K balance drives urgent need for site-specific K nutrient management.

分类号： TQ44

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