1. 1. Balov, V.K. & Shibzuhov, M.N. (2006). Oil content of sunflower seeds, depending on the level of mineral nutrition. Zernovoye hozyaystvo, No. 5, p. 9 [in Russian].
2. 2. Gavryliuk, M.M., Salatenko, V.N. & Chehov, A.V. (2007). Oil crops in Ukraine. Kyiv: Osnova [in Ukrainian].
3. 3. Golunova, L.A. (2013). Regulation of the production process and symbiotic nitrogen fixation of soybean using retardants (Extended abstract of candidate thesis). Institute of Plant Physiology and Genetics, Kyiv, Ukraine [in Ukrainian].
4. 4. Gorodniy, M.M. & Gonar, O.M. (2006). Applied biochemistry and quality management of crop production. Kyiv: Aristey [in Ukrainian].
5. 5. Gulyayev, B.I., Karlova, A.B. & Kiriziy, D.A. (2007). Influence of chlormequat chloride and esterone on the absorption by sugar beet of mineral nutrition elements. Fiziologiya i biokhimiya kul't. rasteniy, 39, No. 5, pp. 401-408 [in Ukrainian].