Vegetables that are not harmful to the public are products that do not contain hazardous substances that are prohibited by national regulations, and other substances that contain a controlled content to the extent permitted. Technical aspects of production:
1. The selection of disease-resistant and low nitrate-rich varieties is appropriate. In particular, the choice of pest-resistant varieties is necessary for the more serious types of vegetables for which effective methods of prevention are not yet available。
2. Seed treatment and seedbed disinfection. Sterilization of the fungus by seeds and soil-borne vegetables is strictly carried out to reduce the disease during the nursery period and to reduce the amount of medicine used for planting。
Seed treatment: pre-plant testing of seed purity, purity, thousands of grain weights, germ rates, moisture and pests。
Temperature soup impregnated species: seeds are immersed in water of 50 ~ 55 °c (i. E., two open water to one cold water), mixed by immersion, hot water is replenished at any time for 10 - 15 minutes and cold water is reduced。
Pharmacist treatment: formerin impregnated 20-30 minutes with 50-100 times more, extracts seeds from closed fumigation for 2-3 hours and washes them with clean water to prevent cucumber anthrax and atrophy; cucumber anthrax 10-15 minutes with 100 times more copper sulphate, extracts clean medicine with clean water to prevent cucumber anthrax and atrophy; immersed with 10 per cent of the sodium phosphate solution, then wash with water until it is neutral。
3. Sowing in due time. Vegetable seasons are closely related to pests and pests, and appropriate planting periods are selected according to vegetable varieties and climatic conditions of the year。
The tomatoes are suitable for the studio cold bed in late december and the shed hotbed in early december
The cucumber is suitable for early ripening in mid-february and mid-late ripening in late february to mid-march
(a) bean is suitable for the period march-april
Garang is suitable for the mid-july season, and early ripening can be done well in advance of late june。
4. Cultivating seedlings. Cultivation, age-appropriate seedling, early seedlings and soil migration are used to reduce and increase resistance to the disease during the period。
The criteria for seedlings are: the integrity of the branches, the absence of damage, the absence of insects, the thick, the short, the thick of the leaves, the short of the leaves, the colour of the green, the strong of the roots, the well-developed side root and the absorption of the roots, the proper age of the seedlings, and the criteria for setting the requirements for planting。
5. Deepness of the earth, with reasonable rotation. In areas where it is possible to reduce the disease base and pest hazards by means of water and dry rotation。
6. Strengthen field management and improve farming practices. (c) promote the cultivation of deep trenches to avoid water accumulation in the fields, contribute to ventilation, reduce inter-plant humidity, eliminate pest and disease strains in a timely manner and reduce the number of pathogens and pests in order to control the occurrence of pests。
