Effects of Shading Cultivation on Leaf Uniformity of Cigar-wrapper Tobacco(Nicotiana tabacum)
In order to explore the influence of shading cultivation on the leaf uniformity of cigar-wrapper tobacco,a cultivar'Chuxue 26'(CX-26)was used as material to conduct different shading treatments in the field,and the leaf thickness,leaf flatness,leaf density,main and branch vein thickness,proportion of leaf vein to leaf dry weight,and SPAD value of the upper and middle leaves at maturity were analyzed.The results showed that the leaf thickness,leaf density and SPAD value of upper leaves decreased gradually with the increase of shading degree.When the light transmittance was 70%,the leaf thickness and leaf density decreased by 35.5%and 33.3%,respectively,compared with the treatment without shading,while they increased gradually in middle leaves.Shade cultivation significantly increased the leaf flatness of upper leaves,but decreased the leaf flatness of middle leaves.When the light transmittance was 70%,the leaf flatness of the upper leaves reached the maximum,which was 0.98.In addition,shading cultivation increased the proportion of the main branches in the upper leaves to the leaf dry matter,and the influence on the proportion of the main branches in the middle leaves to the leaf dry matter showed a downward trend with the increase of shading degree,but no significant difference was observed.Moreover,shading cultivation had no effect on the thickness of the main branches of the middle leaves,but it made the main branches of the upper leaves thinner.Above results provided a theoretical basis for shading cultivation techniques of domestic cigar tobacco.
万方数据
维普
