1. When selecting vegetable plots, pollution-free green vegetable production bases should be planned in a unified manner. They should be located far away from towns, industrial and mining enterprises and traffic thoroughfares, where the soil, atmosphere and water sources are not polluted, and the soil is fertile. , a place with fresh air, no dust and poisonous gas pollution, and a good ecological environment. Environmental quality complies with the regulations of DB221-946-2001. The water source must be clean and contain no harmful substances. It is strictly forbidden to use stagnant water and industrial wastewater for irrigation. Drainage ditches in the production area should be smooth to reduce water accumulation, lower soil humidity, and keep the fields clean. No dead branches, rotten leaves, or stubble should be left in the fields. Timely cultivating and weeding should be carried out. During the stubble break, the opportunity should be taken to properly dry or expose the soil. Promote soil maturation, improve soil physical and chemical properties, eliminate stubble in time, and remove root stubble, dead branches, rotten leaves and debris before plowing.
2. Land preparation and disinfection, fine land preparation, shallow plowing to eliminate stubble, removal of previous crop residues, diseased plant residues, and rotten leaves, and transporting them out of the field for deep burial or burning. Eliminate insect eggs and pupae, clear weeds in the field, eliminate the spread of pests and diseases, and reduce the occurrence of pests and diseases. Sterilize seeds and seedbeds when raising seedlings. Seed disinfection is mainly based on physical disinfection, using warm soup soaking and high temperature dry heat disinfection. If necessary, high-efficiency and low-residue pesticides are used for seed soaking or seed dressing disinfection. The seedbed can be covered with ground wires to raise the soil temperature of the seedbed for disinfection, or 40% formaldehyde can be used for disinfection. . If the cultivation site is a greenhouse, it must be fumigated and disinfected with sulfur powder and other chemicals before transplanting the seedlings.
3. Choose high-quality, high-yield, disease- and pest-resistant varieties. Improved varieties are the basis for high yields and high quality. In recent years, practice in various places has fully proved that selecting excellent vegetable varieties with good stress resistance is the internal cause and key technology for obtaining high-quality pollution-free green vegetables. It is a technology that gets twice the result with half the effort. Therefore, all localities should vigorously promote excellent vegetable varieties with strong stress resistance according to local conditions, and select high-quality, high-yielding, stress-resistant, and commercial vegetable varieties to lay a solid foundation and create prerequisites for the production of green vegetables.
4. Treat the seeds well. Soak the seeds with nucleotide. Soak the seeds in warm soup with 50-55℃ warm water at a constant temperature for 20 minutes to disinfect the seeds. Nutrient bowls and electric heating in greenhouses are used to raise seedlings. In seedling management, measures such as high temperature to promote roots and early hardening of seedlings are used to prevent leggy growth, reduce seedling diseases, make seedlings grow strong and enhance disease resistance, and strictly select strong seedlings free of diseases and pests for cultivation. site.
5. Field fertilization technology, mainly using organic fertilizers, minimizing or using no chemical fertilizers, applying 4000-5000 kilograms of high-quality ring fertilizer, compost, retting fertilizer, biogas fertilizer, green manure, straw and other farmyard manure to the first acres of cultivated land , and turn it into the deep part of the tillage layer, and apply it in a shallow layer, with 150-200 kilograms of decomposed cake fertilizer per mu, and mix in compound bacterial fertilizer to inhibit the occurrence of diseases and insect pests. The top dressing is mainly decomposed human excrement or dried manure. , supplemented by growth regulators and micro-fertilizers. During the growth period, humic acid nutrient solution---vitamin and vegetable spirit can be sprayed on the leaves to coordinate growth.