Effects of Spraying Potassium Permanganate on Physiological Characteristics, Yield and Quality of Cotton

LI Lingli; LI Wen; ZHU Wei; MA Zongbin; YANG Tiegang

doi:10.15933/j.cnki.1004-3268.2017.01.009

Abstract：In order to solve the decrease of boll weight and fiber quality led by the leaf disease that is caused by the leaf premature withering in the middle and late stage of cotton field,the effects of spraying potassium permanganate on physiological characteristics and yield and quality of cotton were studied.The field experiment was executed with cotton cultivar Zhongmian 50 in 2015 with four spraying potassium permanganate treatments,including 0.1％ potassium permanganate sprayed one time every ten days from July 1 st to Sept.20th,amount to nine times (A),0.1％ potassium permanganate sprayed one time every fifteen days from July 1 st to Sept.15th,amount to six times(B),0.1％ potassium permanganate sprayed one time every twenty days from July 1 st to Sept.20th,amount to five times (C),and no potassium permanganate applied(CK).The results showed that,compared with CK,application of potassium permanganate significantly increased the content of chlorophyll of cotton leaves,the activity of sucrose invertase (INV),photosynthetic rate,the activities of superoxide dismutase (SOD) and peroxidase (POD),significantly reduced malondialdeyde (MDA) accumulation amount in cotton leaves,effectively alleviated the lipid peroxidation of membrane of leaves cells in late stage,delayed leaf senescence,improved physiological functions of leaves,thus significantly increased the boll weight,seed cotton yield,lint percent and seed index,improved the fiber quality.The boll weight of treatment A was the highest,which significantly increased by 28.9％,8.2％ and 19.7％ compared with CK,treatments B and C,respectively.The seed cotton yield of spraying potassium permanganate treatments significantly higher than CK.The seed cotton yield of treatment A was the highest,which significantly increased by 28.6％,9.3％,19.1％ compared with CK,treatment B and treatment C.The fiber strength of treatment A was significantly higher than CK,and comprehensive quality of fiber was the best.Moreover,the plants of cotton spraying potassium permanganate were purplish red stem branches,deep green leaves without disease,big bolls and good boll opening at the late growth stage,which indicated an appearance of better yield and that quality of cotton was red branches,green leaves and open-bolling white fiber.Treatment A was the best that increased production and improved the quality of cotton.