For citations:

Pivovarov V.F., Sirota S.M., Nosova S.M. THE MAIN TRENDS OF BREEDING AND SEED PRODUCTION OF VEGETABLE CROPS IN THE NONCHERNOSEM ZONE BY 2020. Vegetable crops of Russia. 2012;(4):20-24. (In Russ.) https://doi.org/10.18619/2072-9146-2012-4-20-24