The conditions that a good sunflower variety should have

It is generally believed that good varieties should have the following characteristics: high yield per unit area of ① and high oil content of ② oil sunflower seeds. ③ has strong stress resistance and ④ has wide adaptability. However, the following points should also be noted when selecting and using hybrids.

(1) the purity of hybrid seeds. The higher the purity, the higher the yield, and vice versa. Therefore, when selecting seeds, we must ask the purity to prevent someone from adulterating. The purity of the varieties can be found in the oil sunflower growing period, the varieties with high purity have the same height and height, the florescence is neat, and there are no sterile plants.

(2) Regional differences. Some people think that as long as the introduced varieties are well-known good varieties, they can achieve high yield in the introduced areas, which is sometimes true and sometimes ineffective. The similarity between the local climatic conditions and the introduction land should be taken into account, especially the accumulated temperature, frost-free period, rainfall, etc., because the local frost-free period is short (for example, 100 days), and the growth period of the introduced variety is too long, the new variety can not mature normally in the region, resulting in a reduction in yield. In addition, if we refer to the experience of introducing new varieties in neighboring villages and counties, we can often succeed.