Abstract:In order to avoid premature senility of tobacco during late period of field-planting and to improve the quality of tobacco upper leaves, the effects of different planting patterns of tobacco (single ridge, concave ridge double-row, concave ridge double-row and side mulching) on the moisture and temperature of plough soil, the root of tobacco, the growth, output and quality of tobacco upper leaves were studied in Liuyang City, Hunan Province. The results showed that, compared with control (single ridge cultivation), concave ridge double-row and side mulching cultivation increased soil moisture by 1.31%-6.38%, decreased soil temperature by 3.30-4.94 ℃; enhanced the length, diameter, volume and activity of roots by 37.62%, 34.92%, 69.18% and 10.85%, respectively; increased the area, SPAD value, ratio of top rank and output value of tobacco upper leaves by 20.61%, 10.04%, 8.07% and 7.20%, respectively; improved physical character index and chemical component index by 5.90% and 25.39%, respectively. Compared with concave ridge double-row, the concave ridge double-row and side mulching cultivation increased soil moisture by 1.95%-2.65%, decreased soil temperature by 1.41-3.25 ℃; enhanced the length, diameter, volume and activity of roots by 23.24%, 16.442%, 28.62% and 3.28%, respectively; increased the area, SPAD value of tobacco upper leaves by 9.72% and 3.21%, respectively. Therefore, concave ridge double-row and side mulching cultivation is superior to single ridge cultivation in reducing the evaporation of soil water evaporation, retarding the change of soil temperature and the harm of high temperature, promoting the growth of tobacco roots in the late growth stage, improving the photosynthetic capacity of tobacco leaves and increasing the quality of tobacco upper leaves.