When buying sunflower seeds should pay attention to what issues
(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.
China has become the world's largest producer of Antipyretic And Analgesic drugs. The output of aspirin, paracetamol, analgin and other varieties has exceeded 10,000 tons, and the output of phenacetin, aminopyrine, antipyrine and other varieties has exceeded 1,000. Ton. At present, the output of Antipyretic analgesics in my country is growing rapidly, and it is expected to grow at a rate of about 8% in the future. The production of intermediates for antipyretic and analgesic drugs is large, and there are many manufacturers. With the growth of antipyretic and analgesic drugs, their intermediates have also developed by leaps and bounds.
In 2003, the domestic consumption of paracetamol increased rapidly, and the export also showed a rapid growth momentum. The export volume was 28,163 tons, and the annual export volume increased by about double. In the first half of 2004, although its export growth slowed down, it still increased. From January to May 2004, the export volume of paracetamol was 12,501 tons, slightly higher than the same period last year. Para-aminophenol is an important intermediate in the synthesis of paracetamol, which is growing rapidly. The annual output of p-aminophenol in my country is 32,000 tons. It is estimated that by 2005, the domestic production of paracetamol will reach more than 50,000 tons, and the pharmaceutical industry will consume 45,000 tons of p-aminophenol. The total demand for phenol is about 50,000 tons, the market gap is large, and the development and utilization prospects are broad.
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