Effects of different plastic films mulching on soil temperature and moisture,and growth and yield of sugarcane

【Object 】The effects of different plastic films mulching on soil temperature and moisture, and growth and yield of sugarcane were discussed in order to provide references for using different plastic film in sugarcane production. 【Method 】Four kinds of plastic films viz.,normal colorless transparent plastic film,milky photodegradation weeding plastic film,black plastic film and gray-black plastic film were used in sugarcane cultivation by using no film mulching as the control. Soil temperature and moisture were measured during plastic film mulching period,and sugarcane agronomic traits such as emergence rate,tillering rate,plant hight,stalk diameter and effective stalk number were investigated during growth period,the cane yield and economic benefits were calculated during harvest period.【Result 】The results showed that plastic film mulching could significantly increase soil temperature and moisture. Compared with the control,soil temperature was increased by 0.3-0.8 ℃ in three plastic films mulching treatment except for gray-black plastic film mulching. The soil moisture of all mulching treatments was 10.1 %-17.4% higher than the control. Furthermore,the seedling emergence rate,tillering rate,effective stalk number and cane yield also could be improved using plastic film mulching,which were increased by 0.8%-9.9%,20.6%-34.9%,5190-10980 stalks/ha and 6.4%-14.9% as compared to the control,while plant height and stalk diameter were found to be no significant effect by plastic film mulching. The results of benefit analysis indicated that, milky photodegradation weeding film mulching had the highest economic benefit,the second were normal colorless transparent plastic film mulching and black plastic film mulching,which were 5987.2,1876.5 and 1813.5 Yuan/ha higher than the control. The gray-black film mulching treatment had poor benefit. 【 Conclusion 】 The milky photodegradation weeding plastic film could be vigorously extended in sugarcane production. Normal colorless transparent plastic film and black plastic film could be extended gradually as a new kind of plastic film. The gray-black film should not be used for its higher cost and more thickness.