Water – as moisture, has an essential role in all biochemical processes of plants, all vital processes, occurring in a vegetative organism, can proceed normally only under the condition of sufficient saturation of cages by moisture. Results of theoretical researches on dynamics of ground humidity have shown: (1) similarity of physical processes of change of humidity of soil on different irrigated areas. (2) hysteresis of the nature of humidity at irrigation and drainage. (3) the sharp recession of humidity of soil in the root zone. The developed models (33) - (34) can be used in the calculation of moisture and salt transfer both in the initial period of plant development and in the calculation of washing of saline lands. The use of models and the coefficients of the mathematical model to determine the parameters of moisture and salt transfer make it possible to calculate the reserve of soil moisture and optimize the sowing time at its maximum value.

Water - as moisture, has an essential role in all biochemical processes of plants; all vital processes occurring in a vegetative organism can proceed normally only under the condition of sufficient saturation of cages by moisture. Results of theoretical researches on dynamics of ground humidity have shown: (1) similarity of physical processes of change of humidity of soil on different irrigated areas (2) hysteresis of the nature of humidity at irrigation and drainage. (3) sharp recession of humidity of soil in the root zone.

Abstract:Water is an essential resource, especially in arid contrives such as Uzbekistan and most parts Central Asia. Investigation of moisture alterations at different environment was carried out more than 7 years period in Uzbekistan and Commonwealth Independent States (Kazakhstan, Tajikistan and Turkmenistan). Results of theoretical researches on dynamics of ground humidity have shown: (1) similarity of physical processes of change of humidity of soil on different irrigated areas; (2) hysteresis of the nature of humidity at an irrigation and drainage; (3) sharp recession of humidity of soil in the root zone.

Limitation of water resources at the arid countries (Uzbekistan and the most part of the Chinese national democratic republic) demands to develop more exact and mathematically proved methods for moisture management on an irrigated field. Results of theoretical researches on dynamics of humidity have shown: (1) similarity of physical processes of change of humidity of soil on different irrigated areas. (2) Hysteresis of the nature of humidity at an irrigation and drainage. (3) Sharp recession of humidity of soil in the root zone.

The aim of the work is to assess the impact of resource-saving irrigation technologies on water consumption, excavation depth, degree of salinity, duration of the light period, crop density and temperature changes when growing tomato in a managed farming system. The subject of the study is the factors affecting of the Lamia F1 variety tomato yield and water consumption (irrigation rate, soil salinity, excavation depth, duration of the light period, seedling density, temperature changes). Research objectives: to study the influence of managed farming system indicators (light period duration, greenhouse depth, seedling stem thickness, difference between day and night temperatures, salinity degree, irrigation rate) on tomato yield and seasonal irrigation rate; conducting experiments with fractional factorization of tomato yields and seasonal irrigation rates in accordance with managed farming system; development of an irrigation regime for the Lamia F1 variety of tomato culture according to the FAO method for managed farming system conditions; mathematical modeling of the dynamics of soil moisture, the consumption of nutrients when growing tomato crops under managed farming system conditions. The effect of the seasonal irrigation norm, the degree of soil salinity, the depth of the greenhouse, the length of the light period, the thickness of the stem of tomato seedlings, the difference between the maximum and minimum temperatures on the tomato yield of is substantiated; an irrigation regime for tomato crops has been developed based on the FAO method, taking into account managed farming system indicators; mathematical models of thermal regime processes, soil moisture dynamics, nutrient consumption in tomato cultivation under managed farming system conditions have been developed.