Effects of Planting Pattern on Soil Environment and Root Properties of Flue-cured Tobacco

The field experiments were conducted to study the effects of planting pattern on soil environment and root properties of flue-cured tobacco.The results showed that the plastic film mulching could increase the temperature of soil before the period of vigorous growing stage by 5degree compared with the soil uncovered by plastics.Irrigating fixed-root water(2 kilogram/per plant) was helpful for moisture in the soil in bearing prophase of flue-cured tobacco by plastic film mulching.Film covering and high soil moisture content made a bigger soil bulk density,which made extent porosity of soil,and affected the permeability of soil.So the film uncovering was carried out in the production,and selected suitable earth fullow higher.In short,plastic film mulching was good for the root early growth in early transplanting period.But film-uncover promoted the root development in the period from vigorous growing stage to budding..The higher the soil moisture content was,the bigger the root system became,and more fixed-root water were needed,which were good to the root development.