不同植烟密度对烟叶产质量的影响

目的]确定烤烟最适宜的移栽密度,提高植烟经济效益。方法]以云烟85为试材,设3个密度1.5×104、1.8×104、2.1×104株/hm2,观察记载烤烟的株高、叶片数、茎围、腰叶和顶叶的长、宽等农艺性状,并计算各处理烟叶的产量、产值、均价、上等烟比例、中等烟比例、桔黄烟比例等。结果]随着种植密度的增加,烤烟的有效叶数、茎围、腰叶长、宽呈递减趋势。平甫点1.8×104株/hm2处理产值、产量等经济性状最优。甘洞点,以2.1×104株/hm2处理的产量最高;以1.8×104株/hm2处理的产值最高。结论]烤烟在高肥力土壤中的最适种植密度为1.5×104~1.8×104株/hm2。在肥力中等偏下土壤中的适宜种植密度为1.8×104~2.1×104株/hm2。

Effect of Planting Density on Yield and Quality of Tobacco Leaf

Objective] The aim was to determine the most optimum transplanting density for flue-cured tobacco and increase the economic benefit of planting tobacco.Method] With Yunyan 85 as the tested material,3 densities of 1.5×104,1.8×104,2.1×104 plants/hm2 were designed.The agronomic characters of flue-cured tobacco such as plant height,leaf number,stem thickness,length and width of lumbar and apical leaves were observed and recorded and the tobacco yield,output value,average price,the ratio of fine tobacco,middle grade tobacco and orange-yellow tobacco in each treatment were calculated.Result] With the increase of planting density,the effective leaf number,stem thickness,the length and width of lumbar leaf showed a decreasing trend.The economic character such as output value and yield of treatment with 1.8×104 plant/hm2 in Pingpu site was the best.In Gandong site,the yield of treatment with 2.1×104 plant/hm2 was the highest and the output value of treatment with 1.8×104 plant/hm2 was the highest.Conclusion] The most optimum planting density of flue-cured tobacco in higher fertility soil was 1.5×104-1.8×104 plant/hm2,and that in middle and low fertility soil was 1.8×104-2.1×104 plant/hm2.