Effects of Different Ridge Heights on Soil Heat Status,Root Growth,and Leaf Maturity Tolerance of Flue-cured Tobacco
To study the effects of ridge height on soil heat status,root growth,and tobacco maturity tolerance in tobacco planting,a 2-year field experiment was conducted using the flue-cured tobacco variety Yueyan 97 as the test material from 2022 to 2023.Three treatments were set up,including a ridge height of 30 cm(CK),a ridge height of 38 cm(T1),and a ridge height of 46 cm(T2),to analyze the changes in soil temperature and heat flux,root appear-ance and growth indicators,root vitality,and tobacco maturity related indicators under different ridge heights.The results indicated that the daily temperature difference in soil varies with the depth of the soil layer,and the daily temperature difference in the surface layer of the soil was the largest.Increasing ridge height can increase the aver-age temperature of tobacco planting soil by 0.4-1.8 ℃ and increase soil heat flux by 4-56 W/m2.In the 2 a ex-periment,the maximum increase in root length for a ridge height of 38 cm compared to a ridge height of 30 cm was 27.26％,the maximum increase in root dry mass was 26.21％,and the maximum increase in root vitality was 14.97％,with significant differences.Compared with a ridge height of 30 cm,the soluble protein content,peroxidase activity,and cell membrane stability index of a ridge height of 38 cm increased by 17.99％,27.82％,and 9.05 percentage points(2022),respectively and by 10.23％,12.44％,and 8.16 percentage points(2023),respectively.The maximum decrease in malondialdehyde content was 24.84％and 44.43％,respectively.Correlation analysis showed that root activity was significantly negatively correlated with malondialdehyde content,peroxidase activity was extremely significantly positively correlated with root growth indexes,and soluble protein content was signifi-cantly positively correlated with root length.In summary,increasing ridge height is beneficial for improving the ther-mal status of tobacco planting soil,promoting root growth,enhancing root vitality,enhancing leaf antioxidant capaci-ty,and enhancing tobacco maturity tolerance.A ridge height of 38 cm is an appropriate ridge height for promoting root growth and improving tobacco maturity tolerance in southern tobacco regions.
万方数据
维普
