USING THE DRAINAGE WATER FOR IRRIGATION OF COTTON GROWTH

This investigation was carried out in Sir-Dariya research Center, South of Tashkent, capital of the republic of Uzbekistan( USSR). This area suffers from the shortage of irrigation water especially during dry seasons and from the declination of the production because of the salinity. Therefore, the effect of using drainage water as source of irrigation water on the yield of cotton which grows in gray medium to light loam soil and the possibility of using this drainage water in leaching these soil from salts were studied. Results indicated the possibility of producing cotton economically by using drainage water for irrigation.The results shows that it is possible to produce 1631 kg.h(-1) cotton by using river water for first irrigate and the rest irrigation by using drainage water of 5.0-5.5 g.l(-1) salt, also the possibility of producing 1580 kg.h(-1) by using drainage water of 265-3.00 g.l(-1) salt as a source of irrigation water only. and producing 1578 kg.h(-1) by using drainage water of 5.0-5.5 g.l(-1) salt. We used crops programming or programming of agricultural production in the process of mathematical analysis of the results based on the data collection to build upon the design parameters we can apply that experience to get the highest rents agricultural under the circumstances. Mainly we got the models from which to determine the amount made in each transaction so that we can predict the amount of the crop (mathematically), as well as determine the level of ground water and the salt content to get highest cotton production in the harm of salt conditions. The results indicated that in order to get the above results, soils should be leached by using 2500-3000 m(3)/h(-1) water of 2.6-3.0 g.l(-1) salt during autumn.