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There is a great number of repeated and permanent spring wheat crops with insufficient areas occupied by forecrops of the first group in the grain-sowing zones of the Omsk region, which leads to a decrease of soil fertility, productivity and grain quality. The aim of the research is to reveal the influence of rapeseed forecrop on fertility, phytosanitary state of agrophytocenosis, productivity and technological properties of spring wheat grain in the forest-steppe of Western Siberia. Complex studies were carried out in a stationary crop rotation of Omsk Agrarian Scientific Center (rapeseed-wheat-soybean-wheat) in 2011-2017. The effectiveness of different intensity impact of soil cultivation systems in crop rotation and effectiveness of intensification means were studied in a two-factor experiment on meadow-black soil. The influence patterns of agricultural technologies on soil fertility elements, phytosanitary state of agrophytocenosis, productivity and technological parameters of grain were established. It was found that in case of intensity decrease of soil cultivation systems in a crop rotation, especially with limited application of intensification means, there is a spring wheat yield decrease after rapeseed forecrop by 0.17 t / ha. Grain yield increases to 2.88 t / ha in case of complex usage of chemicals, with a decrease of variability over years (variation coefficient) from 55 to 37% or by 1.5 times. The application of fungicides reduces the development and prevalence of infections on the upper layer of leaves and increases yield by 0.56 t / ha or by 27.5%. An increase of the mass of 1000 grains, the nature of grain, the content of protein and gluten was observed on the variant of intensive cultivation technology.

AGROTECHNICAL FEATURES OF SPRING WHEAT PRODUCTIVITY FORMATION AFTER RAPE PLANT IN THE FOREST STEPPE OF WESTERN SIBERIA