Number of Leaves Remained Influences the Growth and Nutrient Accumulation of Flue-Cured Tobacco in Rice-Tobacco Rotation
This study aims to determine the appropriate number of leaves remained of'Yunyan 87'in the field with rice-tobacco rotation in Guiyang,Chenzhou,Hunan.Eight treatments with 13-20 leaves remained were designed.The agronomic traits,leaf area index(LAI),plant architecture,and accumulation and distribution of dry matter,nitrogen,phosphorus,and potassium of flue-cured tobacco in different treatments were measured,on the basis of which the optimum number of leaves remained was determined.The results showed that with the increase in the number of leaves remained,the flue-cured tobacco presented increased plant height,reduced accumulation of nitrogen and phosphorus,and firstly increased and then decreased LAI and accumulation of dry matter and potassium.The flue-cured tobacco plants with 13-14,15-18,and 19-20 leaves showcased short barrel,barrel,and drum architectures,respectively.Too few leaves remained led to short tobacco plants and affected the development of middle and lower tobacco leaves,while too many leaves remained reduced the LAI and affected tobacco yield and quality.Considering the plant traits and dry matter of tobacco leaves,we suggested that 17-19 leaves should be remained for'Yunyan 87'in rice-tobacco rotation in the study area.
number of leaves remainedflue-cured tobaccoagronomic traitsplant architecturenutrient accumulation and distribution
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