Potassium management in potato production in Northwest region of China

文献类型： 外文期刊

第一作者： Li, Shutian

作者： Li, Shutian;He, Ping;Duan, Yu;Guo, Tianwen;Zhang, Pingliang;Johnston, Adrian;Shcherbakov, Alexey

作者机构：

关键词： Potato;Potassium;Yield response;K use efficiency;Critical level;K recommendation

期刊名称：FIELD CROPS RESEARCH （ 影响因子：5.224； 五年影响因子：6.19 ）

ISSN：

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收录情况： SCI

摘要： Field trials were conducted to study response of potato (Solanum tuberosum L) yield and quality to potassium (K) application, soil indigenous K supply (IKS) and productivity (IKP), K use efficiency and critical level of soil test K to establish scientific methods for K management in potato production. Results indicated that K application increased tuber yield by a range of -2.8 to 7.2 Mg ha(-1) with an average of 3.2 Mg ha(-1), 90% positive responses. Potassium application produced an average of 4.9 percentage more commercial rate, 11.3 g more mean tuber weight and 0.4 percentage more tuber starch content and 0.2 percentage less tuber sugar content than those of treatment without K application. The average agronomic efficiency of potassium (AE(K)) was 30.2 kg tuber kg(-1) K2O,56% observations was in 10-40 kg tuber kg(-1) K2O. 79.2% of the observations showed negative K balance in potato fields with an average of 101.7 kg K ha(-1) deficit. 87.5% of all the observations showed positive benefit from K application with an average return of US$715 ha(-1). The average IKS and IMP was 141.8 kg K ha(-1) and 25.9 Mg ha(-1) which can be explained 25% and 30% of variations, respectively, by soil exchangeable K. Significant negative quadratic relationship (R-2=0.75, P < 0.01) between yield response and relative yield, and significant linear relationship (R-2=0.80, P < 0.01) between yield response and AE(K) were obtained. There was a significant relationship (R-2=0.74, P < 0.01) between total uptake K by potato plant and total tuber yield. The critical level of soil exchangeable K at 90% relative yield was 105 mg kg(-1) which can be a reference for K recommendation. (C) 2015 Elsevier B.V. All rights reserved.

分类号： S

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