Abstract. In this scientific article, the effect of previous crops on the yield of winter wheat variety "Chillaki" in the conditions of irrigated typical gray soils of Tashkent region is studied. The effect of predecessor crops on the duration of the development phases, biometric indicators and productivity of this variety was observed, and it was scientifically explained and explained that the optimal predecessor crop type for obtaining a higher grain yield (59.6 t/ha) than the local "Chillaki" variety of winter wheat is soybean.