Д. В. Митрофанов Solving the problem of increasing pea yield is one of the main tasks of crop production in the arid conditions of the Orenburg-Cis-Ural region. The most optimal solution is to use pea crops after applying ammophoska for fall plowing in grain-fallow crop rotations and to identify the effect of factors on grain yield. Adding chopped straw and green manure to the soil of pea predecessors without mineral fertilizers does not solve the problem. Conducting field experiments and statistical analysis (regression) of the results obtained is timely and relevant. The aim of the study is to determine the effect of weather conditions, soil productive moisture and nutrients, weeds and precursors of crop rotation on pea yield by nutritional backgrounds in the arid conditions of the Orenburg Region. On the territory of the experimental production farm named after Kuybyshev, Orenburg Region, pea crops (2002–2022) are being studied in 6-field and 2-field crop rotations on a longterm stationary experimental plot established in 1990. The repetition of the two-factor experiment is fourfold in the area and twentyfold in time. Factor A is backgrounds: fertilized (ammophoska – N 40 P 40 K 40 kg/ha) and unfertilized (control). Factor B is options: five pea predecessors (two durum and three soft wheat) of crop rotations. Average data were obtained: air temperature for May-August is +16.2…+22.8°C; precipitation – 21.7–42.7 mm; number of dry days – 14–18; hydrothermal coefficient (HTC) – 0.09–0.19; productive moisture content after sowing – 126.9–137.9 mm, before harvesting – 32.2–51.2 mm, consumption – 170.7–179.6 mm; N-NO 3 on a fertilized nutritional background – 84–101, 55–86, 9–30 mg and on an unfertilized background – 66–76, 45–74, 1–25 mg; P2O5–58–63, 52–60, 0–7 mg and 43–46, 37–45, 0–7 mg; K 2 O – 423–500, 367–454, 42–56 mg and 382–425, 329–404, 13–53 mg/kg; the number of weeds in the germination phase – 91–139 and 84–109 pcs., in the ripening phase – 40–58 and 37–49 pcs./m2; the mass of weeds – 35.8–47.1 and 33.8–42, 2 g/m 2 ; yield – 0.65–0.87 and 0.60–0.83 t/ha; increase in pea grain – 0.01–0.06 t. The observations revealed an increase in pea yield by nutritional backgrounds in a six-field crop rotation with summer sowing of Sudan grass, depending on the effect of June precipitation, ammophoska and the precursor of soft wheat. Lack of precipitation in June, spent moisture, nitrate nitrogen and weeds significantly reduced pea yield after durum wheat in a two-field crop rotation. The experimental variants revealed a significant effect of dry weather conditions, use of productive moisture, soil nutrient imbalance and weed infestation on pea yield reduction in grainfallow and green manure rotations. The effect of other factors combined was insignificant.
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