EFFECT OF CROP ROTATION WITH LUPINE AND BASIC SOIL CULTIVATION METHODS ON WEED INFESTATION OF SOWING IN BRYANSK REGION
Tests have been done on gray forest soil in the South-West of the Non-Chernozem zone of Bryansk re-gion in the stationary experiment in the All-Russian Lupin Research Institute in 2015–2018. The aim of the test was to evaluate the effect of the intensity of the basic soil cultivation on crop weed infestation in lupin crop rotation. The experiment has been done during a rotation of the field crop rotation (winter wheat – bare oats – winter triticale – lupin) turned in time and space in the fields of white lupin and win-ter wheat where lupin has been cultivated as a predecessor. During the test years 7 weeds species have been fixed at tillering phase of winter wheat, its number made 9.4–15.4 units/m2. The number of the main weeds decreased to 11 species at the end of the vegetation season (at ripeness stage) and made 9.7–15.9 units/m2. There have been noticed 8 weeds species in white lupin crops, the number made 33.6–55.8 units/m2. The deep non-moldboard soil cultivation decreased weeds number in crop rotation. At dif-ferent basic soil cultivation 8 weeds species occurred in crops. The others were either in the deep non-moldboard soil cultivation or in the surface one. The number and ratio of weeds species changed when the grass component increased to the final field of crop rotation. The annual dicotyledonous species made 45.0–60.5% decreasing at the surface cultivation. Perennial weeds made 38.5–55.0% of the total weeds coenosis. Their number decreased in the case of deep cultivation. Crop infestation degree and as a result the weeds twice during the rotation at the surface soil cultivation.