Spectral and Photosynthetic Characteristics of Cotton under Chemical-controlled Topping Technology  

作　　者：Bing Chen Jing Wang Qifeng Wu Gang Wang Jing Zhao Huanyong Han Fangyong Wang 

机构地区：[1]Xinjiang Academy of Agricultural and Reclamation Sciences/Key Laboratory of Biology and Genetics and Breeding of Northwest Inland Cotton,Ministry of Agriculture,Shihezi 832000,China [2]Institute of Water Conservation and Architectural Engineering,Xinjiang Shihezi Vocational College,Shihezi 832003,China

出　　处：《Plant Diseases and Pests》2021年第3期9-16,24,共9页植物病虫害研究（英文版）

基　　金：Supported by National Natural Science Foundation of China (41961054);Second Level Project of Xinjiang Corps Talents & Leading Talents Project of Xinjiang Production and Construction Corps(2019CB018)。

摘　　要：[Objective] The paper was to study the effect of chemical-controlled topping technology on spectral and photosynthetic characteristics of cotton. [Method] Two row spacing configurations and four topping treatments were set in the experiment field, and the spectral and photosynthetic characteristics of cotton under different configurations and topping treatments were analyzed. [Result] There was no significant difference in spectral reflectance of cotton leaves and canopy among all treatments(T1-T8) before topping. After topping, the spectral reflectance of cotton leaves showed little difference in visible light band, but significant differences in near-infrared light band under two row spacing configurations(T2-T4, T6-T8).And in near-infrared band, compared with CK(T1, T5), the reflectance increased and then decreased under close planting with equal row spacing configurations(T2-T4) and narrow row dense planting configurations(T6-T8). However, the change of cotton canopy reflectance in short infrared bands increased first and then decreased under close planting with equal row spacing configuration, and increased constantly under narrow row dense planting configuration. The photosynthetic capacity of leaves increased, and the net photosynthetic rate(A), stomatal conductance(GH_(2O)),transpirationrate(E) and intercellular CO_(2) concentration(Ci) significantly increased by controlling the top with chemicals, and differences were ob-served between two configurations. After topping treatments, the leaf area of apical leaf increased, and chemical-controlled topping treatments had significant difference with the control. The apical cotton leaves were shrunk internally, and the plant height increased gradually by 7-15 cm;the number of fruit branches increased by 2-4, and the area of apical leaves decreased significantly in chemical-controlled topping treatments.[Conclusion] After topping with chemicals, the spectral characteristics of cotton change, the photosynthetic capacity of leaves is improved, and the growth of ap

关 键 词：Chemical-controlled topping COTTON Reflectance PHOTOSYNTHETIC Growth characteristics 

分 类 号：S562[农业科学—作物学]