Effects of different cultivation patterns on microorganism of soil rhizosphere in sugarcane fields Analysis of allelochemicals and allelopathic effect of rhizosphere soils of newly planted and ratoon sugarcane (Saccharum officenarum L.) Effects of Meteorological Factors on Stalk Elongation in New-planting and Ratooning Sugarcane Effect of cropping approach and harvest time on yield and sugar content of sugarcane