Potassium distribution in root and non-root zones of two cotton genotypes and its accumulation in their organs as affected by drought and potassium stress conditions

文献类型： 外文期刊

第一作者： Wang, Xiao

作者： Wang, Xiao;Mohamed, Ibrahim;Chen, Fang;Wang, Xiao;Mohamed, Ibrahim;Chen, Fang;Mohamed, Ibrahim;Ali, Maha;Abbas, Mohamed H. H.;Shah, Ghulam Mustafa

作者机构：

关键词： Gossypium hirsutum; potassium deficiency; drought; potassium fractions; soil microorganisms

期刊名称：JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE （ 影响因子：2.426； 五年影响因子：3.029 ）

ISSN： 1436-8730

年卷期： 2019 年 182 卷 1 期

页码：

收录情况： SCI

摘要： A rhizobox experiment was conducted to compare the differences of soil potassium (K) distribution and absorption between two cotton (Gossypium hirsutum L.) genotypes under drought and K-deficit conditions. Treatments included two levels of water (drought and optimum soil moisture: 25% and 35% volumetric water content) and K fertilizer rates (0 and 0.48 g potash kg(-1) soil) applied to two cotton genotypes (namely HEG and LEG). Both the genotypes showed significant differences in total K accumulation without exogenous K addition. After absorption, soil content of the readily available potassium (RAK) decreased rapidly. This promoted the conversion of the mineral K into slowly available potassium (SAK). Drought significantly decreased the cotton growth and K use efficiency, and thereby reduced the effect of K fertilizer. Consequantly, the contents of RAK and SAK were greatly increased. However, K bioavailability was decreased under water stress conditions. Differences in root parameters and soil microorganisms between two cotton genotypes were significantly increased and had marked relations with available soil K contents. This study provides important information for understanding the mechanism of K use efficiency, especially under water and K stress.

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