(1) Purchase from a regular seed sales unit. At present, there are many channels for seed management, and the seed market is relatively confusing. Many farmers blindly purchase crops and are often harmed by counterfeit seeds. Therefore, when purchasing a seed, it is necessary to purchase the seed from a variety of formal channels that have complete licenses and good corporate reputation and performance capabilities. After purchase, you should request a regular purchase invoice or seed quality credit card.
(2) Choose the species that suits your area. During the purchase, we must pay attention to whether or not to cross the region, whether it has been tested and introduced, whether it can adapt to the natural conditions of the region (such as climate, soil type, soil quality, etc.) and the resistance to pests and diseases that may occur in the region.
(3) Select good varieties. The yield levels of different varieties under the same input and under the same cultivation conditions vary greatly, and some can reach more than 30%. Do not think that the varieties that have not been heard are new varieties. It is necessary to clarify the validation period of the varieties, the validation methods and the application effects on production, and understand the characteristics of the varieties, such as the production status, the length of the commodity grain, and the disease resistance.
(4) Choices based on local conditions. If you have a large area of ​​land, you can consider the planting mix of early, middle and late maturity varieties. However, the selected species must be safe and mature. In general, the accumulated temperature of the species is preferably 100~150°C less than the accumulated temperature of the local activities. If the ripening period is too short, the first is the waste of accumulated temperature, the second is the low level of production, and the third is the premature decline of the plants. If the ripening period is too long, the sunflower has not been fully matured and is killed by the frost, resulting in serious deterioration of quality. If the water and fertilizer conditions of the plot are poor, the varieties that are resistant to barrenness and strong resistance should be selected in order to stabilize the production.
(5) Selection of appearance quality of hybrids.
1 see the grain type. Generally high purity varieties have little difference in grain size. 2 See the seed color. The new seeds are bright and bright, and the seeds have a darker color. See seed uniformity and clarity. Qualified sunflower hybrids are generally uniform in uniformity, with full kernels and high 100-grain weight; diseased grains, damaged grains, sand and weeds, crop stalks, and other crops, and other impurities, and no insects.
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