Choose a variety of zucchini varieties that are resistant to disease, high yield, good quality, and good appearance. Soil fertigation, courgette hi slightly acidic soil, the appropriate ph value of 5.5 to 6.8. Zucchini has a strong absorption capacity. Excessive application of nitrogenous fertilizers can easily cause stems and leaves to grow long, resulting in the occurrence of fruit drop and disease. Nitrogen, phosphorus and potassium should be used in combination with fertilization. In general, for every 1000 kg of fruit harvested, 3.29 kg of nitrogen, 2.13 kg of phosphorus, and 7.29 kg of potassium are absorbed. When sowing seedlings are planted, no matter nursery seedlings or nursery seedlings are used, they must be prepared with nutritious soil first. This is the key to nurturing strong seedlings. Take 3 fertile lands where no melons have been planted within 3 or 4 years, a decomposed rim fertilizer, a small amount of plant ash and sawdust, mix well, sifted, and then mash or mash, ready for use. Sowing, cover soil thickness 2 cm. After completing this work, a small amount of bran mixed with methamidophos should be sprinkled on the surface to prevent pests in the ground. Then, moisten with a small shed film until it emerges. The standard for age-appropriate seedlings of Zucchini is about 30 days, with 3 to 4 true leaves, a plant height of about 10 cm, a stem diameter of 0.5 cm, a petiole length equal to the leaf length, a dark green leaf color, intact cotyledons, and a well-developed root system. . During the seedling period, the temperature is maintained at 20°C to 25°C during the day. When the temperature exceeds 25°C, ventilation is required to reduce the temperature. The nighttime temperature is maintained at 10°C to 15°C, and the lowest temperature should not be lower than 6°C. During this period, we must scientifically control the amount of water that can be poured when there is a significant shortage of water. After watering, we must pay attention to ventilation, reduce air humidity, and prevent diseases. In order to prevent the emergence of blight, blight and other diseases, a small amount of Wanqin and Guanling may be used to irrigate the roots twice; in order to prevent the diseases of the leaves from occurring, they may be sprayed with thiophanate-methyl or chlorothalonil leaves every 7 days. Shi once.
Organic raw materials refer to the petrochemical industry that uses petroleum and natural gas as raw materials, and the industry to produce or fractionate various organic Chemical Products from the raw material gas after coal gasification and the coal tar recovered by dry distillation from grain fermentation to produce alcohol or solvent. In my country's organic chemical industry, the route of producing acetylene from calcium carbide from coal, the route of coal gasification to synthesize methanol and formaldehyde, the route of recovering benzene, naphthalene, and anthracene from coal tar, and the route of fermenting and distilling grains as raw materials to produce alcohol were developed.
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