Journal of Food, Agriculture and Environment




Vol 12, Issue 1,2014
Online ISSN: 1459-0263
Print ISSN: 1459-0255


Cotton potassium uptake and use efficiency vary with potassium application rates and soil potassium nutrition levels


Author(s):

Yuan Chen 1, Yujing Wen 2, Jun Wang 1, Xiang Zhang 1, Dehua Chen 1*

Recieved Date: 2013-09-16, Accepted Date: 2014-01-05

Abstract:

The objective of this study was to investigate the characteristics of cotton cultivars in potassium absorption and utilization and the responses of different genotypes in potassium uptake and use efficiency to K-fertilizer applications under different soil K levels. In 2007, a field experiment was conducted to assess whether genotypic differences among 19 cultivars exist for potassium absorption and use efficiency (KAE and KUE). In 2008, eight cultivars were selected according to the evaluated types in KAE and KUE from 2007 experiment results to further investigate the KAE and KUE changes at three K fertilizer application rates in K-deficit and K-rich soil, respectively. The results showed that variation existed among cultivars in KAE and KUE in the field. The cultivars could be separated into four genotypes: high KUE (high KUE and moderate KAE), high KAE (moderately KUE and highly KAE), moderately efficient (moderate KUE and KAE), and inefficient (low KUE and KAE). Under K-rich soil, high KUE cultivars had highest seed cotton yields, high KAE cultivars had greatest K uptake, and KAE and KUE declined with K rates increased. The greatest KUE and KAE were observed at the combination of high KUE cultivars and 75 kg hm-2 K rate and the combination of high KAE cultivars and 75 kg hm-2 K rate, respectively. Under K-deficit soil, the highest seed cotton yield and the greatest KAE were also observed at high KUE cultivars and high KAE cultivars, respectively. However, the greatest KAE and KUE were mostly found at 225 kg hm-2 K rate, except for high KUE cultivars, whose the highest KAE were found at 75 kg hm-2 K rate. These results suggested that breeding of high KUE cultivars and matching K fertilizer application under different K nutrition level soil were an important management practice to bolster cotton KUE and to maintain highly KAE.

Keywords:

Cotton, potassium uptake efficiency, potassium use efficiency, K nutrition


Journal: Journal of Food, Agriculture and Environment
Year: 2014
Volume: 12
Issue: 1
Category: Agriculture
Pages: 221-227


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