Abstract: In order to explore the effects of tillage depth on the growth, development, yield and quality of tobacco plants in the Zhaoyang tobacco-growing area, there was experimental research on the depth of the tillage to the treatments 20 cm (T1), 25 cm (T2), 30 cm (T3) and CK (15 cm) by the randomized block design in the field. The results showed that there were significantly different at 0.05 of volume-weight and soil porosity between T2 and T1 in the long-term, and there was significantly different at 0.05 level of volume-weight between T2 and T3. The T2 dry matter accumulation of tobacco plants roots, stems and leaves was comparatively large at different times, followed by T3 and T1, and CK was the worst. The root-knot nematode disease of T3 was the lightest, the incidence rate was 25.23%, and there was significantly different at 0.05 level with CK; the disease index T3 (4.04) < T1 (5.27) < T2 (5.39), significantly lower than CK (18.64) at 0.01 level. In the agronomic traits, the plant height of T2 was 112.85 cm, the leaf area coefficient of T2 was 3.09, and the stem circumference of T3 was 12.07 cm, which was significantly higher than CK at 0.05 level. In the economic traits, T2 yield, upper grade tobacco ratio (α=0.01), medium grade tobacco ratio (α=0.05) were significantly higher than CK; T3 yield (α=0.05) was significantly higher than CK; T1 medium grade tobacco ratio (α=0.01) was significantly higher than CK. On the whole, the economic traits of T2 flue-cured tobacco was the best, followed by T3 and T1, and CK was the worst. The study found that the continuous ploughing depth of 25-30 cm can improve soil physical properties, reduce the occurrence of root-knot nematode disease, promote the growth and development of tobacco plants, and improve the yield and quality of tobacco.

Key words: Flue-cured tobacco, Tillage depth, Soil, Physical properties, Growth and development, Yield and quality

CLC Number: 

• S341.1