The combination of straw return and appropriate K fertilizer amounts enhances both soil health and rice yield in Northeast China

文献类型： 外文期刊

第一作者： Hou, Yunpeng

作者： Hou, Yunpeng;Kong, Lili;Zhang, Lei;Wang, Lichun;Xu, Xinpeng

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期刊名称：AGRONOMY JOURNAL （ 影响因子：2.24； 五年影响因子：2.829 ）

ISSN： 0002-1962

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收录情况： SCI

摘要： To identify the ideal potassium (K) fertilization rate in fields with continuous straw return to maintain soil potassium supply and increase yield in the rice-producing regions of Northeast China, we studied the effect of different K fertilizer application amounts (0, 30, 60, 90, 120, 150, and 180 kg K2O ha(-1) yr(-1)) on rice yield, K use efficiency, and soil K availability in straw-returned and straw-removed plots from 2017 to 2019. Results showed that the highest rice yield in straw-returned plots (60 K2O ha(-1)) was 3.3% higher than that in the straw-removed plots (90 K2O ha(-1)), and the straw-return treatment attained higher K use efficiencies under low K fertilizer application conditions (30 and 60 kg K2O ha(-1)). Compared with straw-removed plots, straw-returned plots had increased exchangeable K and nonexchangeable K contents in the top 20 cm of soil. The ranges of K fertilizer application amount required to maintain soil K balance (K input-K output) in straw-returned plots and straw-removed plots were 48-53 kg ha(-1) and 127-140 kg ha(-1), respectively. Continuous straw return in rice-producing regions in Northeast China can decrease K fertilizer application needs by 62.2% compared with straw-removed plots while simultaneously maintaining soil K balance. Straw return plays an important role in increasing crop yield, preventing soil K depletion, and keeping the development of K resources sustainable.

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