Experimental Research on Infiltration Flow in the Soil of Drip Irrigation Technique for Suitable Water-Saving Irrigation for Grape Leaves at the Water-Scarce Region of Vietnam

Drip irrigation is a water-saving technique for crops in water-stressed areas. Drippers deliver water to the soil surface directly, continuously, and on a regular basis, and it infiltrates into the cultivated soil layer to ensure that plants grow and develop properly. The authors carried out the experiment and observed infiltration flow while researching soil moisture of the drip irrigation technique to determine the suitable irrigation schedule for Grape leaves in a water-scarce region. Based on observed and calculated results, the authors have proposed a correlation of parameters as follows: infiltration depth, the average radius of wetting front on horizontal direction, irrigation water amount and time, the velocity of horizontal (vr) and vertical (vz) permeability of drip irrigation technique. The correlation coefficients of parameters are high (R2 from 0.906 to 0.9899). This research objective to determine the infiltration process and the deep of water after watering to serve for research on soil moisture process and determine the suitable irrigation schedule for Grape leaves in particular and for terrestrial plants (with short roots) in general at the water-scarce region in the South Central Part of Vietnam.