In this article, taking into account the biological characteristics of regionalized early-ripening "Guljahan", mid-ripening "Ilgor", Iskandar" late-ripening "Mustaqiliklik", "Lazurniy", "UzROS-7/13" varieties of rice, grown in different water thicknesses, in the conditions of grassland-swamp soils of Tashkent region. amylase, starch and protein contents of rice grain were determined. Rice varieties 5; 10; When grown in water thicknesses of 15 and 20 cm, the amylase content of "Lazurnyy" variety is 21.4%, starch content is 69.9%, and protein content is 11.2%, which is higher than other varieties.