A heterogeneous potassium supply enhances the leaf potassium concentration of ridge-cultivated tobacco grown in calcareous soil

文献类型： 外文期刊

第一作者： Lu, Dianjun

作者： Lu, Dianjun;Yan, Taotao;Wang, Yiliu;Chen, Xiaoqin;Wang, Huoyan;Zhou, Jianmin;Huan, Weiwei;Jiang, Chaoqiang;Zu, Chaolong;Zhang, Xiang

作者机构：

关键词： Nicotiana tabacum;plant-available K;placement;space heterogeneity

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： 2017 年 180 卷 6 期

页码：

收录情况： SCI

摘要： The high potassium (K)-fixing capacity of calcareous soils with homogeneous K supply limits crop K concentration. The objective of this study was to determine the increase in the leaf K concentration of tobacco (Nicotiana tabaccum L.) with a heterogeneous K supply. Two field experiments were conducted from 2013 to 2015 with five K rates applied in homogeneous environments and one K rate applied in varying fractions of soil volume (from 0% to 100%) in heterogeneous environments. Under ridge culture, leaf biomass was not significantly affected by homogeneous (K rate) or heterogeneous (patch size) K management. Under homogeneous conditions, increasing the K supply to three times the standard rate used by farmers (249 kg K ha(-1)) increased leaf K concentration significantly, but the effect was limited and not cost-effective. Heterogeneous supply of K fertilizer at the standard K rate in patches of 0-40% of soil volume outperformed homogeneous K supply in terms of leaf K concentrations. Furthermore, K fertilizer mixed in intermediate soil volume fractions of 1-20% resulted in higher leaf K concentrations than the smallest (0%) and larger (30-40%) soil fractions. However, such K-rich patch application should be managed precisely with specific placement due to the sharp reduction in available K with increasing distance from the fertilizer. To maximize the sorption of immobile K, the match between the uptake volume of the rhizosphere and the area available for K diffusion is important.

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