Device for determining critical wind speed of stalk breaking to evaluate maize lodging resistance  

作　　者：Jun Xue Bo Ming Keru Wang Ruizhi Xie Peng Hou Shaokun Li 

机构地区：[1]Institute of Crop Sciences,Chinese Academy of Agricultural Sciences,Key Laboratory of Crop Physiology and Ecology,Ministry of Agriculture and Rural Affairs,Beijing 100081,China

出　　处：《International Journal of Agricultural and Biological Engineering》2020年第5期1-7,共7页国际农业与生物工程学报（英文）

基　　金：This study was supported by the National Key Research and Development Program of China(Grant No.2018YFD0100206);the Central Public-interest Scientific Institution Basal Research Fund(Grant No.Y2019PT07);the China Agriculture Research System(CARS-02-25);the Agricultural Science and Technology Innovation Project of Chinese Academy of Agricultural Sciences.

摘　　要：The accurate evaluation of the lodging resistance of maize plants can provide a basis for the breeding of lodging-resistant cultivars and the regulation of cultivation measures.However,the traditional methods for evaluating maize lodging resistance in terms of plant morphology and stalk mechanical strength have certain limitations.The objective of this research was to develop a device for determining the critical wind speed of maize stalk breaking.The device was equipped with a centrifugal fan to supply airflow and was powered by a frequency conversion motor.The frequency converter adjusted the motor speed and thus adjusted the wind speed.The wind speed decreased first and then increased with increasing height above the outlet of the device,and maximum wind speed can reach 40 m/s.This device was convenient for transportation in the field,has a low cost,and can quickly,accurately,and objectively determine the lodging resistance.Field tests showed that the device ran stably for a long time.The coefficient of variation of three repeated measurements was between 1.5%and 4.8%for four maize cultivars.The new device can measure the critical wind speed of maize lodging and identify the lodging resistance for different maize cultivars,cultivation practices,and plant health conditions,and can thus overcome barriers to measuring the maize lodging resistance under natural wind conditions.

关 键 词：MAIZE stalk lodging critical wind speed TURBOFAN measuring device wind pressure 

分 类 号：S51[农业科学—作物学]