EFFECT OF ROOT-SOIL PARAMETERS ON THE LODGING RESISTANCE OF SUGARCANE (SACCHARUM OFFICINARUM L.)

Lodging reduce sugarcane yield, also results in the increase of harvest loss and head-splitting rate in mechanical harvesting. Although there are some researches on lodging resistance of sugarcane, there are few studies on the effects of root-soil multi-factor, which limits the discovery of the most important lodging resistance influence factors and the most effective lodging resistance technical measure of sugarcane. This study aimed at: (1) establishing the mathematical model of the relationship between F-30 degrees and the root and soil parameters using the artificially induced tilt experiment for sugarcane. F-30 degrees is the maximum pulling force in the process of the tilt angle (the angle between stem and ground) changing from 90 degrees to 30 degrees; (2) studying the effects of lodging resistance using the model. The results show that the established model is reasonable. The two most important influence factors of sugarcane lodging resistance are number of roots and interaction between planting depth and soil hardness. The most effective measure to improve the lodging resistance is to increase the number of roots through breeding and reasonable fertilization, and to increase the planting depth, meanwhile, to establish good drainage measures to timely drain water in typhoon season for reducing soil moisture and maintaining greater soil hardness.