1. To implement crop rotation, choose vegetable plots of different families to grow leafy vegetables. Perennial green leafy vegetables are to be soil-sterilized. 2, clean the garden, after the harvest of vegetables in front of the timely removal of dead leaves, stubble and weeds around, concentrated deep or burned, and reduce the residual diseases and insects on the infected plants. 3, soil disinfection, use one of the following methods to disinfect the soil, you can eliminate the obstacles of continuous cropping. (1) Flooding and disinfection method. In the summer, the vegetable field is deeper than 20 cm, flooded to keep the water layer 5 cm, and covered with plastic film or lime. After 10 days, the film was opened, drained, and planted after the whitening plow. (2) ammonium bicarbonate method. After harvesting the leek in summer, ammonium bicarbonate fertilizer is evenly spread on the vegetable surface, using 30-50 kilograms of ammonium bicarbonate per acre. Then covered with plastic film, ammonium bicarbonate decomposition of volatile ammonia eliminate pests. After a period of 7 days, the film is peeled off and re-seeded by plowing. 4, choose a good disease-resistant varieties, according to different seasons to select the appropriate species. 5. In the summer, more typhoons and rainstorms occurred. When it rained, small arches were used to cover the shade nets and films to prevent typhoon rain from affecting the growth of vegetables. 6, Reasonable irrigation, timely drainage and irrigation, timely drainage in the typhoon storm season, pay attention to irrigation water can not use contaminated water, so as to avoid vegetables also be contaminated. Small thunderstorms with very little rain in the hot noon summer season must be filled with water immediately after the rain to prevent them from dripping into hot soil under light rain. Water vapor will evaporate and burn the leaves. 7, rational fertilization, fertilization should be dominated by organic fertilizer, supplemented by Other fertilizers. As far as possible, multiple compound fertilizers are used. The growth period of leafy vegetables is short, heavy base fertilizer is used for light fertilizer, one-time base fertilizer is applied, no fertilizer or less top dressing is used during the growth period, and top dressing is done as early as possible, and no quick-acting nitrogen fertilizer is pursued during the late growth phase. In the 8 days before harvesting, the application of nitrogen fertilizer was stopped, and nitrate accumulation on leafy vegetables was reduced. 8. Integrated control of diseases and pests Common main diseases of leafy vegetables include downy mildew, soft rot, vitiligo, sclerotia, etc. The main pests include: Plutella xylostella, cabbage worm, flea beetle, spotted fly, Spodoptera litura and so on. Comprehensive application of disease-resistant varieties, rational rotation, rational arrangement of cornices, clean garden science and management of fertilizer, soil disinfection and other agricultural measures to prevent pests and diseases. Chemical control, preferably biological pesticides, biochemicals or insect growth regulators. (1) Disease prevention and control: Agricultural Streptomycin, Kelu, Rhizoctonia, Thiophanate, Mancozeb, Carbendazim, Antivirus, etc. (2) Pest control: Dichlorvos, Imidacloprid, Tianli, Cypermethrin, Mec, Ruijinte, Kung Fu, Abamectin, etc. (3) scientific use of pesticides, strict concentration of pesticides used, to achieve the right medicine; science mixed pesticides, so as not to reduce the effect of pesticide control; alternating use of pesticides, to avoid pest resistance. (4) It is forbidden to use highly toxic and high-residue pesticides such as methamidophos, isocarbophos, omethoate, methyl 1605, insecticidal cockroaches, monocrotophos, carbofuran, and sodium pentachlorophenol. 9. Harvest vegetables in strict accordance with pesticide safety intervals. Harvested vegetables cannot be soaked in sewage, and vegetables cannot be shipped with contaminated equipment.
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