RA T K 21

RA T K 21 is a medium-maturing sunflower (Helianthus annuus L.) hybrid, intended for cultivation under various climatic conditions, particularly in the North Caucasus and Lower Volga regions. The vegetation period ranges from 102 to 117 days, depending on the region, with average flowering. Plants reach medium to medium-high height, have green leaf coloration and yellow disc flowers. Branching is absent in this hybrid, and leaf pubescence varies from weak to moderate. Seeds are characterized by weakly expressed marginal stripes and practically absent stripes between the edges.

The hybrid exhibits high resistance to a range of diseases, including moderate resistance to false powdery mildew, white mold, and phomopsis. In field conditions, plants are slightly affected by dry rot, but may suffer severe rust infection. Resistance group to Sclerotinia is 4 points, with an infection level of approximately 13.4%. Average oil content in seeds is about 48.5-48.8%, making this hybrid attractive for oilseed production.

Yield of RA T K 21 varies depending on the region and cultivation conditions. In the North Caucasus region, average yield is around 23.6-23.9 centners per hectare, with maximum yields up to 40.7 centners per hectare, while in the Lower Volga region, average yield ranges from 16.4-19 centners per hectare, with maximum values reaching 23.5 centners per hectare. Thousand-seed mass fluctuates from 51 to 59.7 grams, indicating good seed material quality. Due to its adaptability and disease resistance, the RA T K 21 hybrid is a reliable choice for agronomists aiming to achieve stable and high sunflower yields.