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Comparison of potential potassium leaching associated with organic and inorganic potassium sources in different arable soils in China

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Pedosphere 2022年第2期32卷 330-338页

作者： Dianjun LU Yanhong DONG Xiaoqin CHEN Huoyan WANG Jianmin ZHOU State key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China Soil and Fertilizer Station of Shandong Province Jinan 250100China

Potassium (k) leaching is detrimental to the maintenance of sustainable arable soil k fertility,especially in low-k fixation *** is not known whether the application of inorganic fertilizers with lower k mobility or crop straw can reduce potential k leaching in low-k fixation arable *** potential k leaching of 14 representative arable soils with different k fixation capacities in China was evaluated with or without the addition of k under two rainfall intensities (90 and 225 mm),and then potential k leaching was assessed in relation to five k sources (kCl,k_(2)SO_(4),kH_(2)PO_(4),maize (Zea mays L.) straw,and rice (Oryza sativa L.) straw).Without k addition,k leaching mainly occurred in sandy soils at 90 mm of rainfall and in soils with greater organic matter at225 mm of *** k addition,the leaching percentage of exogenous k ranged from 0.6%to 11.6%at 90 mm of rainfall and 1.2%to 21.2%at 225 mm of *** greatest k leaching occurred in soils with fewer k-bearing minerals and lower pH at both rainfall *** most cases,kH_(2)PO_(4),which has lower k mobility,markedly reduced k leaching in both high-and low-k leaching soils at the two rainfall *** and rice straw reduced k leaching only in soils with high k leaching,regardless of rainfall amount,whereas more k was leached in soils with lower k leaching at high rainfall *** conclusion,kH_(2)PO_(4) and straw should be preferred for reducing k leaching in low-k fixation arable soils.

关键词： crop straw k-bearing mineral k fixation k source soil type

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