Abstract:

With the cotton of North Xinjiang as the study case, the cotton’s growth stage was analysed by regulating seeding dates for different accumulate temperature. The growth analysis method was used to study the accumulating and partitioning process of dry matter in cotton and the change of LAI, NAR, RGR and CGR as well as the relationship of LAI and CGR. The results showed cotton must attain certain effective accumulated temperature to complete its growth stage, and active accumulated temperature has certain fluctuations, but lesser than fluctuations of days of growth period. The dry matter from full boll stage to opening boll stage has the obvious difference under the different accumulate temperature. Furthermore we find a strong correlation between CGR and LAI, and which can determine the most suitable leaf area index.