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Comparative effects of crop residue incorporation and inorganic potassium fertilisation on apparent potassium balance and soil potassium pools under a wheat-cotton system

文献类型： 外文期刊

作者： Sui, Ning 1 ; Yu, Chaoran 1 ; Song, Guanglei 1 ; Zhang, Fan 1 ; Liu, Ruixian 3 ; Yang, Changqin 3 ; Meng, Yali 1 ; Zhou, 1 ;

作者机构： 1.Nanjing Agr Univ, Key Lab Crop Physiol & Ecol, Minist Agr, Nanjing 210095, Jiangsu, Peoples R China

2.Zhejiang Chinese Med Univ, Minist Pharmaceut Sci, Hangzhou 310053, Zhejiang, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Ind Crops, Nanjing 210014, Jiangsu, Peoples R China

关键词： consecutive crop residue incorporation;soil potassium fertility;soil potassium forms;soil potassium release and potassium fixation capacity

期刊名称：SOIL RESEARCH （ 影响因子：1.987； 五年影响因子：2.47 ）

ISSN： 1838-675X

年卷期： 2017 年 55 卷 8 期

页码：

收录情况： SCI

摘要： The objective of this study was to evaluate the effects of consecutive crop residue incorporation and potassium (K) fertilisation on plant-soil K balance, K forms, K release and K fixation capacity under wheat-cotton rotation at Nanjing and Dafeng in China. Six treatments were evaluated: control (without K input), wheat straw at 0.9 t ha(-1), cotton residue at 0.7 t ha(-1), wheat straw and cotton residue at the aforementioned rates, and 150 and 300 kg ha(-1) fertiliser K. Treatments in each rotation year had an identical rate of nitrogen and phosphate fertiliser application. The initial soil K content was higher in Dafeng than Nanjing. In the low K content soil of Nanjing, crop K uptake with double crop straw was significantly higher than that under single crop straw return or inorganic fertiliser, and K uptake increased with increasing K inputs. Only double crop straw or 300 kg ha(-1) fertiliser K treatments reached apparent K balance in Nanjing, but not in Dafeng. The high negative K balance resulted from the elevated K removal by crops in Dafeng. Incorporation of double crop residues favoured accumulation of different forms of K. Application of K fertiliser tended to increase soil water-soluble K, and crop residue incorporation greatly improved non-exchangeable K at a depth of 0-20 cm. Similar to K fertiliser, crop residue incorporation significantly increased soil K release and decreased K fixation at both sites. In summary, in a 3-year field experiment, crop residue incorporation and inorganic K fertilisation had similar effects on soil K pools and balance depending on initial soil K level and actual K input.

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