关键词: 烤烟, 上六片, 产值, 感官指标, 施氮量, 种植密度, 留叶数

Abstract: To establish “shangliupian” flue-cured tobacco cultivation technical index system in central Henan region, this paper took Zhongyan-100 as test material; set 3 cultivation factors including nitrogen application rate as 30~66 kg·hm-2, planting density as 13 500~18 000 plant·hm-2 and residual leaves number as 16~22 piece·plant-1; adopted  L9(34) orthogonal experiment design; and studied the effects of 3 cultivation factors and their interaction on the output value and sensory indexes of upper 6 tobacco leaves. Single factor effect analysis indicated that within the scope of this experiment, the output value of upper 6 leaves showed a trend of single peak curve with the increase of nitrogen application rate and planting density. The sensory score decreased with the increase of nitrogen application rate, and decreased first then increased with the increase of planting density and number of leaves. Two-factor interaction  analysis showed that the interaction between nitrogen application rate and planting density had significant effects on the output value, sensory total score and aroma quality score. The interaction between nitrogen application rate and residual leaf numbers mainly affected the aroma amount score. Based on the single factor and two-factor analysis, mathematical models for output value and sensory indexes were used to simulate and optimize the parameters separately. The results showed that when nitrogen application quantity was 45.928 5~50.169 0 kg·hm-2, planting density was 15 720~16 045 plant·hm-2 and number of residual leaves were 19~22 leaves·plant-1, respectively, the output value and sensory quality could reach their maximum for upper 6 leaves in central Henan tobacco region. This was the optimized combination for quality upper six leaves in central Henan tobacco region.

Key words: flue-cured tobacco, upper six leaves, output value, sensory index, nitrogen application rate, planting density, number of residual leaves