For citations:

Bobrenko I.A., Vorobyov V.V., Popova V.I. PRODUCTION TESTS OF FOLIAR FEEDING OF SUNFLOWER ON THE BLACK SOIL OF ORDINARY NORTHERN KAZAKHSTAN. Bulletin of Manash Kozybayev North Kazakhstan University. 2026;(1 (69)):219-224. (In Russ.) https://doi.org/10.54596/2958-0048-2026-1-219-224