Effects of Deep Vertical Rotary Tillage on Soil Physical Characteristics and Root Development of Flue-Cured Tobacco in Paddy-Tobacco Growing Area in Changsha

doi:10.7668/hbnxb.20190952

Abstract

Abstract: In order to improve the soil environment and soil quality of tobacco planting in rice growing area of Changsha. Through field experiments, 1 deep vertical rotary tillage(T1) treatment and 2 conventional controls were set up, including the ploughed furrow(T2) and direct rotary ploughing(T3), to explore the effects of different tillage methods on soil physical characteristics and dry and fresh weight of flue-cured tobacco roots in the rice-tobacco zone area in Changsha. The results showed that deep vertical rotary tillage improved the soil surface physical structure. Within the overall range of 0-30 cm surface layer, T1 deep vertical rotary tillage treatment showed an average reduction in bulk density and compactness of 8.8%, 29.7%, and an average increase in porosity of 10.67 percentage points in 2018, compared with T3 conventional treatment(local tillage method). In 2019, T1's bulk density and compactness decreased by 11.25%, 21.45% on average compared with T3, and porosity increased by 12.8 percentage on average. Within 3-5 months of flue-cured tobacco transplanting, the average moisture content of the soil at T1 was 0.62 percentage points higher than that at T2 in 0-10 cm, 3.23, 4.92 percentage points higher than that at T2 and T3 in 10-20 cm, 9.43, 12.3 percentage points higher at 20-30 cm, 9.56, 13.88 percentage points higher at 30-40 cm, respectively. At the same time, compared with conventional treatment, the D value was increased and the stability of soil aggregates was improved. In addition, the dry mass of flue-cured tobacco roots under T1 treatment was 69.75%, 28.93% and 28.33% higher at maturity than that under T3 treatment, and the volume of roots was 20.07%, 55.61% and 36.34% higher than that under T3 treatment. To sum up, deep vertical rotary tillage bed improved soil physical properties such as soil bulk density, compactness, porosity, soil moisture, soil aggregate stability and so on, improved soil environment, increased the biomass and volume of flue-cured tobacco roots and laid a foundation for improving the yield and output value of tobacco leaves.

Key words: Deep vertical rotary tillage, Physical properties, Root system, Rice-tobacco zone area

CLC Number:

S511.01

PENG Guangjue, WANG Zhiyong, HU Tong, ZHENG Zhongyi, TANG Chungui, LIU Yongjun, LI Qiang, ZHOU Qingming, LI Juan. Effects of Deep Vertical Rotary Tillage on Soil Physical Characteristics and Root Development of Flue-Cured Tobacco in Paddy-Tobacco Growing Area in Changsha[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2021, 36(1): 134-142. doi: 10.7668/hbnxb.20190952.

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