Effects of DPC on Agronomic Traits and Economic Characters of Machine-Harvested Cotton in the Yellow River Valley of China and Chemical Control Techniques

作     者：Liying LIU Maohua DAI Zhenliang WU 刘丽英;戴茂华;吴振良

作者机构：Dryland Farming Research Institute Hebei Academy of Agriculture and Forestry Sciences Key Laboratory for Crop Drought Resistant Research of Hebei Province Hengshui 053000 China 

出 版 物：《Agricultural Science & Technology》 (农业科学与技术（英文版）)

年 卷 期：2017年第18卷第10期

页      面：1887-1891页

学科分类：09[农学] 0901[农学-作物学] 

基　　金：Supported by the Fundamental Research Funds of the Heibei Academy of Agriculture and Forestry Sciences(A2015040201) the Cotton Industry Technology System of Hebei Province the Key Research and Development Planning Program of Hebei Province(16226303D) the Financial Program of Hebei Province(F17C10005)~~ 

主　　题：Machine-harvested cotton Agronomic characters Yield Fiber quality Chemical controlling technique 

摘      要：[Objective] The aim was to investigate the effects of DPC chemical controlling technique on agronomic traits, yield and quality of machine-harvested cotton in the Yellow River Valley of China, and clarify the reasonable control period and the application amount of DPC. [Method] The new machine-harvested cotton variety Hengmian HD008 was used as the test material, and 3 different DPC treatments were set. [Result] DPC significantly reduced plant height and branch length, reduced branch angle and leaf area, so the rational control can effectively shape the ideal plant type of machine-harvested cotton. DPC had significant effects on yield and yield components, and the proper amount of DPC could increase the number of bolls during hot days, the number bolls in autumn and the total number of bolls. It increased the boll weight and seed index, but decreased lint percentage decreased, and proper amount of DPC could increase the yield. DPC significantly increased the specific breaking strength of fibers, and proper control could improve the uniformity of fibers, but other indexes had no significant influence. [Conclusion] According to the requirements of machine harvest to the agronomic traits of cotton and the growth characteristics of cotton plant, chemical control could begin after floral bud emergence in cotton about every 10 d, and the spraying amount can be controlled according to the growth amount of the main stem. The daily growth amount of plant height should be controlled at 1.5-1.8 cm, and the plant height should be within 75-90 cm.