Changes Of Soil Moisture Under Different Tillage Methods In Sugarcane Land In Guangxi

Sugarcane is planted in dry farming.The poor hydraulic property and weak ability to resist drought of soil depend upon its development conditions in partial soils in Guangxi.The dynamic change rules of soil moisture and water flux,and plant available water were investigated through different tillage methods on sugarcane field in Guangxi,which having an important practical significance and theoretical value on increasing the soil moisture use efficiency,improving crop drought resistance and achieving high-stable yield of crop in sugarcane growing area.Four kinds of different tillage pattern sugarcane were investigated including smash ridging and non-mulching the areas(T0%),smash ridging mulching areas(T100%),no-tillage and non-mulching areas(NT0%),and no-tillage mulching areas(NT100%).The soil moisture was long-term measured by Theta-probe moisture probe.The soil water retention curve and fitting parameters including plant available water,soil moisture potential and soil water flux were obtained by fitting the RETC software,and differences,movement and factors among which were analysed.The main results of this study were as follows:According to the data of soil moisture monitoring and plant available water in four different tillage treatments,the soil moisture content in no-tillage was higher than that of smash ridging cultivation,and the plant available water was more than that of no-tillage under the condition of non-mulching.Under mulching condition,the soil moisture content and plant available water of smash ridging cultivation were higher than that of no-tillage.Under the condition of smash ridging cultivation or no-tillage,the soil moisture content and plant available water of mulching treatment were higher than that of non-mulching treatment.Therefore,the soil moisture content and plant available water in smash ridging cultivation are better than that in no tillage,which in the mulching treatment were better than that in the non-mulching treatment.Therefore,smash ridging and mulching tillage are beneficial to improve soil moisture retention capacity,absorption and utilization of sugarcane in Guangxi.The result showed that the absolute value of soil moisture potential decreased with increasing of soil moisture content through analysis of soil moisture potential and soil water flux from four different treatments of sugarcane lands.Under non-mulching or mulching treatment conditions,the soil water flux of smash ridging cultivation were 332.202 mm and 1058.942 mm,and mainly flowing upward in the profile in the 5-20 cm layer,however,which were-1288.500 mm and-980.599 mm,and flowing downward under the condition of no-tillage.Under the condition of smash ridging cultivation,the soil water flux of the mulching was 3.187 times as much as that of the non-mulching treatment,which flowing upward in the profile.The soil water flux in non-mulching treatment was 1.314 times as much as that of mulching treatment,and flowed downward in the profile.Under the non-mulching treatment condition,no-tillage water flux was 1.017 times as much as that of smash ridging cultivation in the 20-40 cm layer,and both flowed upward.Under the condition of mulching treatment,the water fluxes of smash ridging cultivation was-322.097 mm and flowed downward in profile,however,which of no-tillage was 678.581 mm and flowed upward.Under the condition of smash ridging cultivation,the water fluxes of non-mulching treatment was 941.622 mm and mainly flowed upward,however,which of mulching treatment was-322.097 mm and mainly flowed downward.Under no-tillage condition,the water flux in non-mulching treatment was 1.411 times as much as that of mulching treatment,and both flowed upward.Therefore,smash ridging and mulching tillage are beneficial to the movement of soil moisture and the absorption and utilization of water by plants.