Report on Soil Compaction Stress Affecting Tobacco Early Growth

oil play a crucial role in tobacco growing.Soil compaction was one of the limiting factors in tobacco growing.Experiments with different soil compaction were conducted to study the effects of soil compaction stress on tobacco early growth.The results showed that the suitable soil compaction stress for the tobacco variety Honghuadajinyuan were between 1.1 g/cm3～1.3 g/cm3.Soil compaction mainly affected the longitudinal growth of the root,and affected little on the cross growth of it.Soil compaction only adversely affected the stem girth in 15 days～25 days after transplanting.Soil compaction influenced plant height in 15 days after transplanting,and the growth rate for the the treatment of 1.33 g/cm3,1.27 g/cm3,1.12 g/cm3 groups(D4,D5,D6) was significantly higher than that of other groups.Soil compaction had significant difference in leaf area,root dry weight,but the number of blades,root fresh weight,stem fresh weight,leaf fresh weight,leaf dry weight,total dry matter and root shoot ratio had no significant difference.