What conditions should an excellent sunflower variety meet

It is generally believed that an excellent variety should have the following characteristics: (1) high yield per unit area; (2) high oil content in the seeds of oilseed sunflowers; (3) strong stress resistance; (4) wide adaptability. However, when selecting and using hybrid seeds, the following points should also be noted.

(1) The purity of hybrid seeds. The higher the purity, the higher the yield, and vice versa. Therefore, when selecting seeds, be sure to ask clearly about the purity to prevent anyone from adulterating them. The purity of a variety can be determined by investigation during the growing period of oilseed sunflowers. Varieties with high purity have uniform plant height, uniform flowering period, and no sterile plants.

(2) Regional differences. Some people believe that as long as a well-known excellent variety is introduced, high yield can be obtained in the introduced region. This view is sometimes correct and sometimes not. When introducing a variety, the similarity between the local climate conditions and those of the place of introduction should be considered, especially accumulated temperature, frost-free period, rainfall, and so on, because if the local frost-free period is short (for example, 100 days) while the introduced variety has too long a growth period, the new variety cannot mature normally locally, thereby causing reduced yield. In addition, if one refers to the experience of neighboring villages or neighboring counties in introducing new varieties, success is often also achieved.