Controlled-release potassium chloride containing mepiquat chloride improved bioavailability of soil potassium and growth of cotton plants. Issue 13 (10th November 2021)

• Record Type: Journal Article
• Authors: Chen, Jianqiu; Yang, Xiuyi; Geng, Jibiao; Wang, Yingjian; Liu, Qianjin; Zhang, Hanyu; Hao, Xiaodong; Guo, Zongduan; Chen, Haining
• Is Part Of: Archives of agronomy and soil science. Volume 67:Issue 13(2021)
• Page Start: 1901
• Page End: 1915
• Publication Date: 2021-11-10
• Subjects: Controlled-release potassium -- cotton yield -- soil K forms; Horticulture -- Periodicals; Soils -- Periodicals; 630.5
• DOI: 10.1080/03650340.2020.1817902
• Languages: English
• ISSNs: 0365-0340

Abstract

ABSTRACT: Cotton is an important cash crop with an indeterminate growth characteristic. The labor costs of multiple management practices, including repeated foliar applications of mepiquat chloride (MC) and topdressing with potassium (K) fertilizers, restrict its planting area and benefits. To help address this problem, a field experiment was performed to evaluate the effects of controlled-release potassium chloride containing mepiquat chloride (CRKMC) on soil K forms and cotton yield. CRKMC, 70%CRKMC (30% reduced K dosage), CRK (coated potassium chloride), KCl and no K fertilizer used treatments were carried out. Results showed that MC and K from CRKMC exhibited a trend of slow release, followed by fast release and eventually stabilization. Soils maintained more non-exchangeable K than available K. The contents of all soil K forms for the CRKMC treatment were significantly higher than these for KCl. Plant heights, SPAD values and stem diameters in CRKMC and 70%CRKMC were larger than those in KCl. Cotton yield, K use efficiency and net profit in the CRKMC treatment were increased than KCl. The successive release pattern of MC and K from CRKMC corresponded well to the demands of cotton, sufficiently manipulated the plant canopy and provided adequate K nutrition.