In order to study the supporting cultivation measures of the new flue-cured tobacco variety'NC297'in Chuxiong tobacco-growing area,and determine the suitable planting density and number of leaves left,the orthogonal test with three levels of planting density and number of leaves left of flue-cured tobacco'NC297'was designed.The results showed that the density of 13800 plants/hm2 and 18 leaves per plant had the largest plant height,leaf length and leaf width.The disease index of black shank,bacterial wilt,climate spot and common mosaic disease were significantly lower in the medium to low density treatment group than in the high-density control group.Net photosynthetic rate,CO2 concentration,stomatal conductance and transpiration rate of low density treatment all were at a high level.The planting density of 15100 plants/hm2 and 20 leaves per plant showed the best appearance quality,followed by the treatment with the density of 13800 plants/hm2 and 18 leaves per plant.The density of 13800 plants/hm2 and 18 leaves per plant treatment had significantly higher average prices and the highest proportion of medium to high quality tobacco,and high yield.The output value was only second to the treatment with planting density of 16600 plants/hm2 and 18 leaves per plant.The treatment with a density of 13800 plants/hm2 and 18 leaves had the most coordinated chemical composition and the highest total score.According to the results of this experiment,the suitable planting density of flue-cured tobacco'NC297'in Chuxiong tobacco area is 13800 plants/hm2,and the suitable number of leaves left for topping is 18 per plant.
万方数据