NGHIÊN CỨU THỰC NGHIỆM DIỄN BIẾN THẤM TRONG ĐẤT CỦA KỸ THUẬT TƯỚI NHỎ GIỌT PHỤC VỤ TƯỚI TIẾT KIỆM NƯỚC HỢP LÝ CHO CÂY TRỒNG CẠN TẠI VÙNG KHÔ HẠN NAM TRUNG BỘ

Abstract

During the experimental process to determine the suitable irrigation schedule for Grape leaves at the water scarce region, the author observed infiltration process of drip irrigation at two places: (1) Natural soil (without planting crops) and (2) Cultivated soil with Grape leaves. This paper presented experimental results at the natural place (without crops). Based on observed results, the author analysed correlations of parameters as follows: infilltration depth (Z), average radius of wetting front on horizontal direction (R), irrigation water amount (W) and time (t), velocity of horizontal and vertical permeability (V_R and V_z) of drip irrigation technique. The correlation histograms of parameters have high value of R² (from 0.90 to 0.99). Establishing the equation system of homogeneous regression with all verificative results are satisfied, conformable and significant infering the overall in order to apply to suitable water saving irrigation for dry crops (with shallow rooting 0÷45cm) at the Droughty region in the South Central part of Vietnam.