Ground Water Shallow Micro Salty Water Drip Irrigation Soil Water And Salt Transport Research

This research was fully summarizing and inheriting senior's research results and in the advanced experience foundation, unified the characteristic this topic and the request, in the use room the micro salty water drip irrigation experiment, emphatically observed the subsoil water level differently to influence which distributed in the soil for soil water and nitrate concentration under the drip irrigation condition, provided the reference for salt alkaloid as well as developing the underground micro salty water. The subsoil water level respectively is 20,40,60,80,100cm, observing the nitrogen migration and distribution under the drip irrigation condition. In the experiments,the application rate was 0.756/24(L/h), the input concentration was 1g/L and the applied volume was 334334ml.The experimental result indicated that:(1)Before the drip irrigation experiment, each processing volumetric water content assumed the layered distribution, increasing in turn from the surface layer to the ground water potential surface soil moisture content.(2) Under the drip irrigation conditions, the saturated wetted radius on the surface,the vertical wetted distance and the horizontal wetted radius for different subsoil water level increased along with the drop of the subsoil water level depth t; horizontal and vertical wetted distance assumed the power function relations along with the drip irrigation time increase to increase, but the vertical direction wetted distance increase is more obvious than the horizontal direction; Irrigated when the conclusion, the soil water distribution scope increased along with the descent of the subsoil water level.(3)The micro salty water drip irrigation the influence scope was smaller to the salinity, generally it was apart from in the drop 10cm scope; Appears the salinity density lowed front nearby drop, underground water level was lower, the salt front value was higher.(4)Micro salt water drip irrigation had less influence on salt distribution′incidence .This study considered a couple of factor–groundwater,tiny salt water drip irrigation had influence on soil water,salt distribution, comparing to, the former′effect was greater than after.