科研之友
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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.
- 出版日期2015-3-15
- 单位甘肃省农业科学院; 中国农业科学院农业资源与农业区划研究所; Saskatoon; 内蒙古自治区农牧业科学院
