Effect of Silver Black Film Mulching and Unmulching Time on Soil Temperature and Humidity and Tobacco Leaf Quality
In order to explore the effect of silver-black film mulching and uncovering time on flue-cured tobacco produc-tion,and to provide scientific basis for flue-cured tobacco production in Changsha tobacco area,a field experiment was ca-rried out in Changsha tobacco area in 2021.Seven treatments of cover silver black film 30 days before transplanting+un-cover film 40 days after transplanting(T1),60 days after transplanting(T2),do not uncover plastic film(T3),and silver-black film mulching 7 days before transplanting,plus uncover film 40 days after transplanting(T4),60 days after trans-planting(T5),non-mulching film(T6)and non-mulching silver-black film(CK)were used to explore the effects of different silver-black film mulching and uncovering time on soil temperature and humidity,growth and economic benefit of flue-cured tobacco.The results showed that the soil temperature,relative humidity,root growth and dry matter accumulation of flue-cured tobacco treated with T3 and T6 were significantly higher than those of CK during the whole growth period,the yield of tobacco leaves increased by 23.13%and 23.49%respectively compared with CK,and the output value increased by 26.09%and 26.93%,respectively,but there was no significant difference in the growth and economic benefits of flue-cured tobacco 30 days before transplanting and 7 days before transplanting.Silver-black film mulching in Changsha toba-cco area can effectively maintain soil temperature and relative humidity,promote root development and dry matter accumu-lation of flue-cured tobacco,increase the content of total sugar and reducing sugar in lower leaves,and significantly in-crease the yield and output value of flue-cured tobacco.and the later the film is opened,the better the effect of yield and quality improvement.
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