PS 644 — a mid-early hybrid sunflower of linoleic type, intended for cultivation under the herbicide Granstar. It features a strong root system, providing high resistance to lodging and ensuring stable yield. Medium-height plants exhibit excellent drought tolerance and high self-pollination rate, enhancing seed quality and quantity in the head.
The hybrid demonstrates high tolerance to leaf and head diseases, including resistance to new races of downy mildew and common diseases such as phomopsis, phomopsis, and white mold. It also shows resistance to Sclerotinia and infections, making PS 644 a reliable choice for various soil-climate conditions, especially in the forest-steppe and steppe zones of Ukraine.
The vegetation period ranges from 109 to 117 days, with potential yields up to 50 centners per hectare. The hybrid seeds contain a high oil content — from 49 to 52%, with oleic acid content up to 75%, improving product quality. The 1000-seed mass varies from 60 to 80 grams, and protein content reaches 14.5%. The head shape is slightly convex, promoting high seed quantity and overall hybrid productivity.
