The links between potassium availability and soil exchangeable calcium, magnesium, and aluminum are mediated by lime in acidic soil

文献类型： 外文期刊

第一作者： Han, Tianfu

作者： Han, Tianfu;Cai, Andong;Liu, Kailou;Huang, Jing;Wang, Boren;Li, Dongchu;Qaswar, Muhammad;Zhang, Huimin;Han, Tianfu;Feng, Gu;Han, Tianfu;Feng, Gu;Liu, Kailou

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关键词： Acidic soil; Exchangeable Ca2+; Exchangeable K+; Lime addition rate; Long-term fertilization; Rhizosphere

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.308； 五年影响因子：3.586 ）

ISSN： 1439-0108

年卷期： 2019 年 19 卷 3 期

页码：

收录情况： SCI

摘要： PurposeThe aims of this study were to investigate the links between potassium (K) uptake by crops and soil K, exchangeable calcium (Ca2+), magnesium (Mg2+), and aluminum (Al3+) when using lime in acidic soil in southern China.Materials and methodsSoil samples of three treatments (chemical NP fertilizers, NPK, and NPK plus straw (NPKS)) were collected from a 26-year field experiment (0-20cm) and then a rhizobox experiment was conducted with seven lime application rates (0-2.26gkg(-1)). We investigated the soil exchangeable K+, Ca2+, Mg2+, and Al3+ and non-exchangeable K (NEK) in the rhizosphere soil (RS) and non-rhizosphere soils (NRS), and K uptake by crops.Results and discussionAs lime addition rates increased, the average concentration of exchangeable K (EK) in RS under NPK and NPKS treatments decreased to 46.5mgkg(-1) and 70.4mgkg(-1) for maize and wheat, respectively. In treatments with lime application, the NEK concentration was higher in RS and NRS compared with the no-lime in NP treatment but was lower in RS in treatments with K fertilizer input (NPK and NPKS). The K uptake by crops under lime application significantly (p<0.05) increased by 37.6% to 155.1% compared with the no-lime treatments. Lime application significantly increased soil exchangeable Ca2+ (42.9 to 255.7%) and decreased exchangeable Al3+ (23.7 to 86.6%). According to structural equation modeling, lime indirectly influenced K uptake by crops through its effects on soil exchangeable Ca2++Mg2+ and Al3+, EK, and NEK, which accounted for up to 39% (RS) and 46% (NRS) of the variation in the K uptake by crops. Lime directly and negatively affected EK and NEK in NRS but had no direct effects on EK and NEK in RS.ConclusionsOur results suggested that lime-induced K uptake by crops was mediated by K+, Ca2+, and Al3+, and that lime application resulted in higher soilK availability.

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