Study On The Soil Moisture Dynamic Change Of Red Soil Water Interference Infiltration Movement Under Drip Irrigation

Drip irrigation is one of the efficient water-saving section fertilizer irrigation methods, in the drip irrigation experimental study on the past, tend to occur in the northwest arid region, and achieved some results. However in southern hilly area with relatively abundant amount of water in water saving irrigation is a vacancy in study,to study. Based on red soil to the soil sample, this paper studies the different density,distance between head flow, drops the head and the initial moisture content of red double drip irrigation intersection point source infiltration moisture migration rule, for the development and utilization of red soil slope the basic theoretical basis of water-saving irrigation, the results are as follows:(1) Drops below the head and the intersection of the interface horizontal wetting front transport distance is greater than the vertical wetting front transport distance,and drip irrigation under the horizontal and vertical wetting front and intersection interface migration exists a good linear relationship between distance, fitting of the slope of the linear equation K < 1; So in the actual production in red soil drip irrigation is suitable for the roots grow in quickly, rather than root is deep soil to grow crops; In addition, drops his head method of wetting front and infiltration time show a good power function relationship, however the intersection of the interface and the infiltration time good logarithmic function relationship.(2) Red double point source drip irrigation in the wetting front intersection before wet body similar to the shape of vertical section for the oval is perpendicular to the z axis rotation of 3 d graphics. After wetting front intersection, red double point source drip irrigation the shape of wetting body is humid radial wetting front transport distance is greater than the vertical migration distance parallel to the moist of the drip irrigation belt belt, its soil profile approximation is oval. The wet body shape expressed by elliptic equations.(3) Red soil convergence time with drop head spacing, with the increase of the initial moisture content and soil bulk density of the soil and slow, along with the augment of drop head flow accelerated; In addition, in a horizontal time between 2 ~8 min later than vertically;(4)Red soil redistribution of double point source drip drop below the head and the intersection of the interface in the process of wetting front are vertical change value is greater than the radial, this contrary to rule in the process of water supply;Within the same time, moisture content of wetting body differ 1 ~ 5 percentage points;There is a greater redistribution in the process of wet body not only, but also by the wetting body slowly long ellipsoid to spherical trend; Red double point source drip irrigation of soil water redistribution process mainly test after 10 h, within 24 h to complete.