Abstract:

In order to determine the influence of the continuous cropping cotton on the physical properties of cotton field, continuous cotton cropping for 3 years, 10 years and 15 years respectively in south Xinjiang were studied by measuring and analyzing the physical properties of cotton field in different cropping systems which involved rice→wheat-green manure→cotton cropping system (R-W-G-C), and rice→cotton cropping system (R-C). The results showed that after 10 years of continuous cotton cropping the R-W-G-C was better than R-C in term of soil water regime. The soil bulk density of R-W-G-C system was reduced by 2.5%, 2.8% respectively after continuous cotton cropping for 3 and 15 years when compared with the R-C system; There was significantly difference in soil porosity among the different continuous cropping years at 0.01 level. It could be speculated that the cropping system which adapted to arid south Xinjiang area was the rice→wheat-green manure→cotton, and the continuous cropping years should be no more than 15 years.