PurposeTo explore the effects of different planting densities and nitrogen application rates on the growth and the quality characteristics of mountain tobacco, and to provide theoretical basis for high quality, high yield and high efficiency of mountain tobacco.
MethodThree planting densities (13875, 15150 and 16665 plants/hm2) and two nitrogen levels (90 and 105 kg/hm2) were set up by randomized block arrangement with K326 as the experimental material. The effects of different planting densities and nitrogen application rates on the agronomic characters, output value, yield and tobacco leaf quality in mountain tobacco were studied.
ResultThe growth of flue-cured tobacco promoted, the output value and yield increased, the total sugar and reducing sugar decreased, the content of total nitrogen and nicotine increased , and the smoking quality improved with the increase of nitrogen application under the same density. Under the same nitrogen application level, the planting density increased, the growth of tobacco plants slowed down, and tobacco yield and output value increased, but the quality of tobacco leaves single plant continued to decline, total sugar and reducing sugar increased, total nitrogen and nicotine decreased, and the smoking quality showed a downward trend.
ConclusionThe study showed that moderate increase of planting density and nitrogen application could improve the yield and quality of tobacco leaves in mountainous areas. The combination of planting density 15150 plants/hm2 and nitrogen application 105 kg/hm2 is more suitable for the production and development of tobacco in mountainous areas. Its yield increased by 12.76% and output value increased by 8.52% compared with the control. The chemical composition of tobacco leaves are more coordinated and the aroma quantity is higher, fragrance-type characteristics are more prominent, more suitable for mountain tobacco production, high-quality production needs.
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