Abstract
Abstract
Computer model is made in (MATLAB) language to study the effect of deficit irrigation with saline water on the salts accumulation in soil and the effect extent of the lack of water and the salts accumulation on yield. The Model has been applied on summer crop, Maize, and it relies on the principle of balancing water and salt. The Model are uses the basic variables entered in the irrigation (climate data, crop type, soil type, and the rate of moisture depletion , irrigation level, the initial soil salinity and salinity of irrigation water). The results obtained from the program are (daily potential and adjusted Evapotranspiration, daily balance of water and salt, the quantities of irrigation water and Perfusion appointment, The rate of change of concentration of salts before and after Perfusion, electric conductivity of saturation extract at Slaking, calculating the relative defect of seasonal yield). study show when using a little amount of irrigation water we have a little salt accumulation in the soil, but the salt accumulation at the end of the season depends on the gross depth of irrigation water added . Low levels of irrigation led to lower proportional yield in the event that the impact of water shortage was bigger than the impact of irrigation water salinity on productivity, and vice versa. Formulation of mathematical equations to find the relative yield and seasonal actual Evapotranspiration because of irrigation water salinity and water shortage, under the condition of study area and determinants.
Keywords: deficit, salinity, Yield, depletion, Evapotranspiration
