Effect Of Planting Density And Remained Leaf Number On Photo Synthetic Characteristics And Yield And Quality Of Flue-cured Tobacco In Wushan

Planting density and the leaves remaind are two important cultivation measures affect the yield and quality of flue-cured tobacco,take Yunyan97as test material in WuShan ChongQing in2012,this experiment with planting density and leaves remaind of two-factor randomized block design, studied the planting density, leaves remaind and two-factor interaction on flue-cured tobacco photosynthetic properties, yield, production value and bake leaf chemical components, key findings are as follows:1. With the increase of planting density, net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO2concentration (Ci), instant solar energy utilization efficiency (SUE) and water use efficiency (WUE) was gradually increased, reached the highest value in19500plants/hm2treatment; the relative content of chlorophyll was first increased and then decreased, and reached maximum in16500plants/hm2treatment; transpiration rate (Tr) and instantaneous carboxylation efficiency (CUE) decreased firstly and then increased, the maximum value in the13500plants/hm2treatment; stomatal limitation value (Ls) was decreased gradually, reached the maximum value in13500plants/hm2treatment; upper leaves of light intensity decreased gradually, while in the lower leaves showed the trend of first increase then decrease.With the increase of the number of leaves remaind, the net photosynthetic rate (Pn), instant solar energy utilization efficiency (SUE), instantaneous carboxylation efficiency (CUE), water use efficiency (WUE) showed a gradually increasing trend, in22pieces of leaves treatment reached a maximum; the relative content of chlorophyll and transpiration rate (Tr) the trend of gradually decreasing, the maximum value in the14leaves treatment; intercellular CO2concentration (Ci) firstly decreased and then increased, the maximum value in the22leaves remaind treatment; stomatal limitation value (Ls) was first increased and then decreased, in18pieces of leaves treatment reached large value. The light intensity of middle and upper leaves decreased gradually, while the lower leaves was first increased and then decreased.In the planting density and remained leaves number two factor interaction, net photosynthetic rate (Pn), water use efficiency (WUE) and stomatal conductance (Gs), intercellular CO2concentration (Ci) and transient energy utilization rate in T9treatment (planting density of19500strains of/hm2,22remained leaf number) reaches a maximum, in the T1treatment (planting density is13500plants/hm2,14remained leaf number) transpiration rate (Tr) reaches a maximum value; instantaneous carboxylation efficiency (CUE) in T3treatment (planting density is13500plants/hm2,22remained leaf number) can reach a maximum pore; stomatal limitation value (Ls) in the T2(planting density of13500strains of/hm2,18remained leaf number) can reach a maximum.2. Output per unit area and per unit area yield trends over planting density is:19500plants/hm2>16500plants/hm2>13500plants/hm2; the first class leaf rate of tobacco performance:16500plants/hm2>13500plants/hm2>19500plants/hm2; the medium leaf rate of tobacco and tobacco leaf on the medium was as follows:19500plants/hm2>13500plants/hm2>16500plants/hm2. With the increase of the number of leaves, the per unit area yield, output value per unit area, the medium leaf rate of tobacco and tobacco leaf on the medium rate performance:22leaves>18leaves>14leaves; first class leaf rate of tobacco performance:14leaves>22leaves>18leaves. In the planting density and remained leaves number two factor interaction, per unit area yield and output value per unit area in the T8(19500plants/hm2planting density, leaf number18per plant) treatment highest; first class leaf rate of bobacco in the T6(16500plants/hm2planting density and number of leaves left22pieces per plant) treatment, reached the highest; the medium leaf rate of tobacco in T9(19500plants/hm2planting density and number of leaves left22pieces per plant) treatment was the highest; tobacco leaf on the medium in T7(19500plants/hm2planting density and number of leaves left14pieces per plant) treatment reached the highest.3. With the increase of planting density, reducing sugar, chloride and sugar nicotine ratio decreased firstly and then increased, nicotine and potassium increased, nitrogen, the ratio of nitrogen to nicotine and potassium chloride was first increased then decreased than; chemical compatibility evaluation scores reached the highest in treatment of16500plants/hm2; with the increase number of leaves, reducing sugar, nicotine, potassium and potassium chloride ratio is increased first and then decreased, chlorine and nitrogen content decreased, sugar nicotine ratio and the ratio of nitrogen to nicotine size was decreased firstly and then increased; chemical compatibility evaluation scores the highest in22leaves per plant treatment. In the planting density and remained leaves number two factor interaction, the change tendency of each chemical component indexes are not the same, by chemical coordination evaluation scores, T6(16500plants/hm2, planting density and number of leaves left22pieces per plant) under the treatment of chemical compatibility assessment scores the highest.4. The results of this study show that, combined with the photosynthetic characteristics, yield and quality, economic traits and chemical component content of flue-cured tobacco, under the treatment of T8(19500plants/hm2, planting density and number of leaves left18pieces per plant) performance of the best.