施氮量与种植密度对烤烟生长发育及经济性状的影响

Effect of Nitrogen Application Rate and Planting Density on Growth and Development and Economic Traits of Flue-cured Tobacco

为探索施氮量和种植密度对烤烟生长发育及经济性状的影响,2013年在常宁市进行了氮肥与密度试验。结果表明:相同密度下的烤烟产量与产值随着施氮量的增加而增加,其中施氮157.5、180 kg/hm2的处理其烤烟产量分别比施氮135 kg/hm2处理高6.59%和18.07%,其产值分别高126.0和5488.8元/hm2,单位养分产量分别高79.8和109.5 kg/hm2,单位面积净收益分别高747.6和3639.6元/hm2;且最大施氮量处理产量显著高于其余处理;均价随着施氮量增加而递减。在施氮量157.5 kg/hm2水平下,采用1.2 m×0.4 m和1.2 m×0.5 m种植密度,烟叶产量和效益最佳。

To explore the effect of nitrogen application rate and planting density on growth and development and economic traits of flue-cured tobacco,the nitrogen fertilizer and density experiment was conducted in Changning city in 2013. The results showed that the yield and output value of flue-cured tobacco was increased with the increment of N rate under the same planting density,and yield and output value of the treatments of N 157. 5 kg / hm2 and 180 kg / hm2 were higher than those of treatment of N 135 kg / hm2 by 6. 59% and 18. 07%,$ 126. 0 and $ 5488. 8 per ha respectively,and yield per nutrient were increased by 79. 8 kg / hm2 and 109. 5 kg / hm2 respectively,and net income per unit area was increased by$ 747. 6 and $ 3639. 6 per ha respectively. And yield of treatment of N 180 kg / hm2 was significantly higher than that of other treatments. The average price was increased with the decrement of N rate,and the proportion of mid-superior tobacco leaves in treatment of N 180 kg / hm2 was the lowest. Under condition of N 157. 5 kg / hm2,yield and quality of flue-cured tobacco could reach the ideal state under planting by 1. 2 m × 0. 4 m and 1. 2 m × 0. 5 m.