ADAPTED TECHNOLOGY FOR CONDUCTING SPECIALIZED BEEF CATTLE BREEDING IN THE CENTRAL PART OF RUSSIA Pilipenko R.V., Lebedko E.Y. EFFECT OF PRE-SOWING TREATMENT OF SUNFLOWER SEEDS ON PLANT HEIGHT AND PHOTOSYNTHETIC ACTIVITY OF HYBRIDS F1 BOREAS AND F1 DARIUS IN THE SOUTH-WEST OF THE CENTRAL-CHERNOZEM REGION Kotsareva N.V., Kovalenko E.V.
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