SOIL WATER REGIME AND MACRO FERTILIZER DOSES FOR RICE CULTIVATION ON THE DRIP IRRIGATION SYSTEMS

Abstract

The results of studies that indicate possible STI use of drip irrigation systems for the cultivation of rice for ne periodic watering. The substantiation of efficiency of differentiation of soil water status by depth of wetting and pre-irrigation moisture, providing in combination with estimated doses of macrofertilizers obtaining a planned yield of rice up to 7,0 t/ha of grain. Studies conducted on crops of aerobic rice varieties Volgograd under the scheme two-factor experience. The first factor consisted of 3 choices of soil water regime with a constant and differentiated pre-irrigation threshold and layer soil moisture: A1 (80 % HB, h = 0,6 m), A2 (80 % HB, h = 0,4 and 0,6 m) and A3 (70 and 80 % HB, h = 0,4 and 0,6 m). The second factor included 3 versions of the dose of application of macrofertilizers, calculated to obtain: В1 - 5 (N109P62К75); B2 - 6 (N131К90P74) and B3 - 7 (N157P90К108) t of grain from 1 hectare. As a result of years of research found that to maintain the water regime of soil for the studied variants the number of irrigations for the years of 13...18 irrigation standards within 6060…4440 m3/ha.