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Weed Control Experiments in Tobacco Fields with 3 Types of Herbicidal Film

LI YING-JIN(1), YANG XUE-BIAO(1), WANG XING-DE(2), WANG XIU-ZHONG(2), LI JING(2), and CHEN HUI-MING(1)1.Yunnan Tobacco Science Research Institute, Yuxi 653100, Yunnan, China2.Huaning County Tobacco Company, Huaning 652800, Yunnan, China  
To control weed in tobacco field more effectively, field experiments were carried out with 3 types of herbicidal film after flue-cured tobacco transplanting. The results indicated that the control effects of green, black and Kingduer film after 40 days of film covering to monocotyledonous weed (fresh weight) were 90.6%, 97.2% and 56.0%, respectively, and to dicotyledonous weed (fresh weight) were 64.2%, 60.8% and 26.7%, respectively. The variance analysis showed that the difference between different treatments was extremely significant. 30 measurements in 10 days showed that, the average temperature of soil in the depth of 0cm, 5cm, 10cm covering with black herbicidal, Kingduer, green herbicidal, and conventional films were 33.1℃, 28.8℃, 26.8℃ and 24.7℃, respectively.
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