Effects of Different Mulching Methods on Soil Physicochemical Properties,Yield and Quality of Cigar Tobacco Leaves
To investigate the effects of different mulching models on the physicochemical properties of tobacco-planting soil,and the yield and quality of cigar tobacco leaves in Hainan,a field experiment using Haiyan 101 as the test material with five treatments including no mulch(CK),dual color film mulching and removed at 30-35 days after post-transplant(G1),dual color film covering throughout the whole growth period(G2),biodegradable film mulching within the whole growth period(G3),and crop straw incorporation(G4)was conducted.The change of physical and chemical properties of tobacco-planting soil under different mulching models was studied,and the regulation on agronomic traits of cigar tobacco during the main growth period,the physical characteristics,chemical properties and combustibility of leaves and the economic benefits were also explored.The results showed that compared with CK,the soil temperature under G3 significantly increased by 7.12% during the vigorous growth period,and that of G4 significantly increased by 10.01% at maturity.During root spreading period and cluster period,G3 improved the available potassium content by 10.27% and 8.13%,respectively.Compared to CK,the SPAD value in cluster period treated with G3 significantly increased by 8.49%,and the plant height significantly increased by 13.10% in vigorous growth period.At maturity,the stem circumference,maximum leaf length and width under G3 significantly increased by 6.39%,8.09% and 6.17% compared with CK,respectively.After fermentation,compared with CK,G3 reduced the leaf thickness by 5.88% .Among all treatments,G3 had the highest tobacco yield,output value,and economic benefits,with a significant increase of 46.70% in economic benefits compared to CK.In summary,biodegradable film mulching during whole growing period could improve the soil physicochemical properties,maintain well physical characteristic,coordinated chemical composition and good combustibility,and ultimately generate better economic benefits in Hainan tobacco-planting areas.
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