Soaking seeds and germination before planting. Firstly, the watermelon seeds should be disinfected, and then immersed in the new high-fat membrane mother liquor to keep warm, moisturize and swell, and improve the germination rate of the seeds to make the seedlings strong. Repel underground pests and isolate viral infections. After seed soaking, the seed coating agent is used for germination, and after sowing, it is sown. A germinated seed is planted in the center of each nutrient or nutrient block, and the soil is about 1.5 cm thick. The covering soil should not be too shallow, otherwise it will easily dry the young shoots. Seedling management. After sowing, insert a bamboo arch every 50 cm on the seedbed, covered with silver-gray nylon gauze, and cover the plastic film to prevent rain in rainy days. Uncover the film ventilation on sunny days. In order to prevent direct sunlight from seedlings, the shade can be properly shaded when the sun is strong at noon. When the aphids are found on the seedbed, they are immediately treated with chemicals. Ensure that the seedbed sees dryness and avoids excessive moisture or drought in the seedbed.
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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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