IRRIGATION REGIME OF RICE AND DYNAMICS OF SOIL CONTENT IN THE SOIL

. In experiments conducted in 2012-2014, it has been tasked to study the effect of flooding rice paddies on the dynamics of the content of water-soluble salts and salt regime of the value of the rice yield. In the experimental farm of Karaultyubinsk Kazakh Research Institute of Rice in 2012-2014 on a rice paddy field map of the third field crop rotation, consisting of 6 checks, field experiments were laid. In each check its depth of flooding was measured at fixed sites at 9 points. Yields of rice were defined by three one-meter long boards selected at fixed sites for 27 repetitions. In the phase of full ripeness, rice plants were mowed down by hand, which were subsequently thrashed on a stationary thresher. The resulting mass of a grain of rice to the threshing was brought to the standard values and weighed on technical scales. Data were grouped according to the water depth checks. The number of points harvest is 18-31. The calculation of the statistical analysis shows that the relative experience of the average error is within 8.2-12.6 %. Given the spread of certain soil differences, due to a significant area of rice card on which studies have been conducted, we can say about quite satisfactory accuracy of the materials. This is confirmed by the method of field experience, published by B.A. Dospekhov in 1979. The analysis of the dynamics of soil salt regime shows that in the phase of development of rice after the tillering to the beginning of wax ripeness of rice the most optimal in terms of favorable salt regime of the soil layer is deep flooding of 17-22 cm.