| The study aims to investigate the effects of film mulching time,autumn, in early spring, and before sowing, on soil temperature, grain filling characteristics and yield with film mulched double-furrow sowing. The results showed that the soil temperature in 15 cm increased significantly under the treatment of mulching in early spring, increased by 4.10℃ and 7.76℃. The soil temperature increased markedly by 4.07℃～5.35℃ and 3.15℃～5.07℃ in the 20 cm and 25 cm layers. The 100-grain weight of film mulched in autumn was significantly improved by 15.28% compared with the treatment of film mulched in early spring. Correlation analysis indicated that soil temperature at 20 cm and 25 cm layers were positively correlated with maximum filling rate, and with grain yield at filing stage of maize under the treatment of film mulched in autumn. The results indicated that the treatment of film mulched in autumn may shorten filling time, improve the rate of grain filling and thus increase the grain yield, being the best pattern for maize production in arid and semi-arid areas. |