Keywords:
- irrigated typical serozems
- mechanical composition
- agrochemical indicators
- nitrogen dynamics
- degree of supply
- complex fertilizers
- field experience
Abstract
The article presents the result of researches of the provided field experience in the conditions of the old irrigated gray soils formed in the Tashkent region. The data on the mechanical composition of the studied soils, their agrochemical indicators, the dynamics of nitrogen during the growing season of cotton, and also the influence of the use of complex fertilizers have been highlighted. The studied irrigated typical gray soils are medium and heavy loamy. Particles of coarse and fine dust predominate in the mechanical fractions of soils, the content of humus in the plow horizon of soils is 1.23%, total nitrogen 0.097%, total phosphorus 1.157%, total potassium 1.15%. It has been established that according to the level of provision of the arable layer of soils with these elements, they belong to the group of low-availability and further down the soil profile to the group of very low-availability. On variants with the application of various norms and ratios of mineral fertilizers, the amount of mobile nitrogen will increase in pre-sowing application to the bitumization phase and decrease further from bitumization to the maturation phase.
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