Ways to increase durum wheat yield in the south of Russia

The experiment showed that in the risky farming zone where the experiment was carried out, the introduction of mineral nutrition into southern chernozem significantly influenced the content of nutrients in the soil. Experimental studies were carried out in 2018-2021 on the southern chernozem of the Volgograd region, on the fields of the «Eliseev A.N.» peasant farm, located in the Mikhailovsky district. The varieties of spring durum wheat Donskaya Elegiya, Krasnokutka 13 and winter durum wheat Aksinit and Agat Donskoy were compared with the addition of the calculated amount of mineral nutrition for given yield levels. The experience showed that in variants without the addition of mineral nutrition, it accumulated in the early spring (this was the maximum accumulation) from 5.02 (Don Elegy) to 5.07 (Aksinit) mg per 100 g of soil. The application of N147P5K90 to all varieties was marked by the maximum accumulation of the amount of nitrate nitrogen, and it varied between varieties from 7.01 (Aksinit variety) to 7.57 (Krasnokutka 13 variety) mg per 100 g of soil. By the end of the growing season the least amount of nitrate nitrogen was retained on the Aksinit variety – 4.11 mg per 100 g of soil. While the Krasnokutka 13 variety retained the level of 4.71 mg per 100 g of soil. A similar dependence was observed for the accumulation and consumption of mobile phosphorus. As a result, in varieties without the use of mineral nutrition, the yield ranged from 1.34 t/ha (Krasnokutka 13) to 3.41 t/ha (Aksinit). The maximum yield values were obtained from the application of N74Р27К45 and it ranged from 2.41 t/ha (variety Krasnokutka 13) to 4.02 t/ha (variety Aksinit).