The studies were carried out in order to determine the appropriate period of sowing and doses of mineral fertilizers for sweet sorghum in 2018-2020 on leached medium-thick, heavy loamy black soil of Zakamie of the Republic of Tatarstan. Humus content was 6.0-6.2% (according to Tyurin), alkaline hydrolysable nitrogen - 81-84 mg/kg, mobile forms of phosphorus - 167-170 mg, exchangeable potassium - 172-173 mg/kg of soil (according to Chirikov); the sum of the absorbed bases is 40.3-40.8 mg-eq per 100 g of soil, hydrolytic acidity - 3.42-3.50, pH of the salt extract - 5.6-5.7. The seeding amount was 300,000 pcs/ha of viable seeds, the depth of seed placement was 5–6 cm. Mineral fertilizers were applied after harvesting the previous crop, before main tillage. The main tillage type was 22 - 24 cm depth plowing. The forecrop was annual grasses for haylage. High weediness was observed in sorghum crops of the first term (10 May). Moreover, the doses of applied fertilizers significantly increased the weed infestation, their number was 58 pcs/m2on an unfertilized background in the full shoots phase, whereas, their number was 69 pcs/m2 on the background of N60P60K60, and 76 pcs/m2 on the background of N80P80K80. The above trend persisted throughout the growing season of the agrophytocenosis. The sowing time and the mineral nutrition background influenced both the growing season duration and crop formation: N60P60K60, the duration of the growing season averaged 113 days over three years, which is 9 days more compared to the control. The variant of the mineral background up to N80P80K80 increased the vegetation period by 15 days compared to the unfertilized variant of the experiment. The mineral nutrition background of N60P60K60 in the second term of sorghum sowing allowed to obtain a yield increase of feed mass from 6.6 to 8.0 t/ha. The application of mineral fertilizers at a dose of N80P80K80 provided a yield increase from 10.8 to 15.4 t/ha.