RESIDUAL QUANTITIES OF HERBICIDES IN LIGHT-SIEROZEM SOIL OF THE SOUTH OF KAZAKHSTAN

At using herbicides there is a danger of preservation of their residual quantities in various horizons of soil and crop production in the quantities exceeding safe levels. In this regard, the problem of comprehensive study of herbicides behavior in objects of environment becomes significant. It is especially important for studying of residual quantities of herbicides in various layers of the ploughing horizon of soil. The analyses showed that in the conditions of light-sierozem soils of the South of Kazakhstan, the investigated herbicides almost completely decompose in the soil in optimum doses in 60 days that is the positive factor indicating their safety for environment and possibility of seeding next year on cotton fields of rotating crops. In researches the residual quantities before seeding time, emergent and post-emergent herbicides on cotton crops are studied for the first time.