| Aerated drip irrigation,through the irrigation system,transfers the water and air phase through the capillary tube to the roots of crops,which can effectively reduce the hypoxia of roots and improve the water utilization efficiency.Revealing gas drip irrigation,has successively developed experimental research,some scholars on crop results show that the vast majority of cases,aeration irrigation treatment of crop yield,water use efficiency and related physiological indexes were improved significantly,but drip irrigation for internal water infiltration and soil aeration aeration to improve the situation,relatively few studies at home and abroad.Based on this,three kinds of soil and two kinds of drip irrigation technologies were set up,and the indoor soil box test was carried out to conduct a comparative study on the improvement of water infiltration and ventilation of soil by aerated drip irrigation,so as to provide a scientific basis for revealing the effective mechanism of water and air utilization under aerated drip irrigation.The main conclusions are as follows:(1)multi-level experiment with two factors,soil bulk density and irrigation method,was set to study the infiltration status of soil moisture under different bulk density.The results show that soil bulk density has a significant effect on the water infiltration of point source drip irrigation.When the infiltration time is consistent,the horizontal diffusion distance of the soil with large bulk density is obviously larger than that of the soil with small bulk density,while the vertical infiltration distance is smaller than that of the soil with low bulk density.With the increase of bulk density,the ratio of horizontal infiltration distance to vertical infiltration distance increases,and the shape of soil moisture body presents a "oblate" trend.(2)two-factor multi-level experiment was conducted on soil texture and irrigation method to study the infiltration status of soil internal water under different soil texture(soil viscosity)conditions.The results showed that soil texture(soil viscosity)had a significant effect on the water infiltration of point source drip irrigation wets.When the infiltration time was consistent,the horizontal diffusion distance of high-viscosity soil was significantly greater than that of low-viscosity soil,while the vertical infiltration distance was smaller than that of low-viscosity soil.With the increase of viscosity,the ratio of horizontal infiltration distance to vertical infiltration distance increases,and the shape of soil moisture body presents a "oblate" trend.(3)two-factor multi-level test of soil bulk density and irrigation method was set to study the water and gas transmission in soil under different soil bulk density conditions by monitoring the ventilation index of soil internal moisture body.Soil bulk density has obvious influence on the aeration of point source drip irrigation: the increase of soil bulk density changes the physical properties of soil and reduces the aeration of soil.Other conditions being equal,the aeration index of small bulk density soil is obviously better than that of large bulk density soil(dissolved oxygen in soil solution,REDOX potential,oxygen diffusion rate and aeration porosity).Drip irrigation to the improvement of the internal air permeability of soil aeration,by comparing the conventional drip irrigation can be seen that under the condition of other conditions,aeration soil air permeability under drip irrigation index is superior to conventional drip irrigation under the soil air permeability index(soil solution dissolved oxygen,soil REDOX potential,soil oxygen diffusion rate and soil aeration porosity).(4)two-factor multi-level test of soil texture and irrigation mode was set up to study the water and gas transmission in soil under different soil conditions by monitoring the ventilation index of soil internal moisture body.The results showed that soil texture(soil viscosity)had a significant effect on the aeration of point source drip irrigation wet body: the increase of soil viscosity changed the physical properties of soil interior and reduced the aeration of soil.Other conditions being equal,the aeration index of low-viscosity soil is obviously better than that of high-viscosity soil(dissolved oxygen in soil solution,REDOX potential,oxygen diffusion rate and aeration porosity).Drip irrigation to the improvement of the internal air permeability of soil aeration,by comparing the conventional drip irrigation can be seen that under the condition of other conditions,aeration soil air permeability under drip irrigation index is superior to conventional drip irrigation under the soil air permeability index(soil solution dissolved oxygen,soil REDOX potential,soil oxygen diffusion rate and soil aeration porosity). |
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