Sugarcane Yield and Soil Potassium Balance in Potassium Application of Four Consecutive Years
Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2020, Vol. 41 ›› Issue (7): 1347-1353.DOI: 10.3969/j.issn.1000-2561.2020.07.009

• Plant Cultivation, Physiology & Biochemistry • Previous Articles     Next Articles

Sugarcane Yield and Soil Potassium Balance in Potassium Application of Four Consecutive Years

HUANG Zhenrui1,ZHOU Wenling2,AO Junhua2,*(),CHEN Diwen2,HUANG Ying2,JIANG Yong2,LI Qiwei2   

  1. 1. Crops Research Institute, Guangdong Academy of Agricultural Sciences / Guangdong Provincial Key Laboratory of Crop Genetics and Improvement, Guangzhou, Guangdong 510640, China
    2. Guangdong Provincial Bioengineering Institute (Guangzhou Sugarcane Industry Research Institute) / Guangdong Key Lab of Sugarcane Improvement & Biorefinery, Guangzhou, Guangdong 510316, China
  • Received:2019-10-31 Revised:2019-11-20 Online:2020-07-25 Published:2020-08-24
  • Contact: AO Junhua


A four-year (2014 to 2017) potassium fertilizer field experiment designed by a random block with cultivar ‘Yuetang 03-393’ (‘Yuetang 60’) and five K2O levels of 0, 225, 450, 675 and 900 kg/hm2 respectively was conducted to evaluate the effects of the long-term application of potassium fertilizers on sugarcane yield, agronomy efficiency, plant potassium (K) uptake, potassium use efficiency and soil potassium content. Under a certain K2O application range, with the increase of potassium application rate, the agronomy efficiency, yield and potassium use efficiency of sugarcane increased and then decreased, while the output-input ratio was down. The yield and potassium use efficiency of the treatment with 450 kg/hm2 K2O were the highest, and the agronomy efficiency and output-input ratio of the treatment with 225 kg/hm2 K2O were the best. With the increase of potassium fertilizer dosage, the potassium uptake, soil potassium content and potassium equilibrium coefficient of sugarcane plants increased, resulting in luxury absorption of plants, excessive soil potassium content, excessive apparent surplus and waste of potassium resources. The reasonable application of potassium fertilizers could increase the agronomic benefit and yield. However, the excessive application of potassium fertilizers could reduce the agricultural effect and potassium use efficiency, and also result in the waste of resources and loss of K nutrients. Considering agronomy efficiency, fertilizer use efficiency, apparent balance of soil potassium and comprehensive benefits, the recommended amount of potassium fertilizers for sugarcane is K2O 225-450 kg/hm2.

Key words: potassium fertilizer, sugarcane, yield, soil potassium balance

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