ZERO TILLING ON LEACHED CHERNOZEM OF THE KRASNOYARSK FOREST STEPPE
The aim of the research is to study the effect of no tillage with prolonged use on the weediness and yield of spring wheat in the conditions of the Minderlinskoye farm in the Sukhobuzimsky district. The study was carried out on the lands of the Uchkhoz Minderlinskoye in the Sukhobuzimsky district in 2017-2020, which was fulfi in a crop rotation with the following crop rotation: green manure fallow - spring wheat - barley - corn - spring wheat. Weed infestation of crops was realized by a quantitativeweight method with reflof the species composition of weeds in the tillering phase of spring wheat and before harvesting in a 6 fold repetition of a 0.25 m<sup>2</sup> frame. Counting of the harvest was performed according to the method of state variety testing of agricultural crops. Mathematical processing of research results was implemented using the method of analysis of variance. In the fi against monocotyledonous and dicotyledonous weeds, the tank mixture Puma Super 100 + Pruner was used. The object of research was spring wheat of the Novosibirskaya 15 variety. The soil cover is represented by leached chernozem, mediumthick, with a humus content in the arable layer of up to 8.0 %. With threeyear systematic methods of direct sowing of spring wheat into the mulching layer, the productivity of the crop is lower than the generally accepted technology for an unfertilized background by 0.9-2.2 c/ha, for a fertilized background by 2.7-8.9 c/ha. Moreover, the decrease in yield increases from the fi year to the third year for both backgrounds. In 2020 (the fourth year of research), the yield of spring wheat cultivated with direct seeding is the highest. For the nonfertilized background, it was 24.1 c/ha, which is 4.1 c/ha lower than the generally accepted technology. According to the fertilized background, the yield is 33.4 c/ha, which is 0.8 c/ha higher than dump plowing.