The pollution-free vegetables are safe and high quality, and have been favored by people in recent years. The production of pollution-free vegetables in addition to the protection of the production environment, the correct use of low-toxic low-residue pesticides, reasonable fertilization can also play a role in disease resistance. Select disease-resistant varieties, and timely select the varieties with strong disease resistance when applying appropriate spray fertilizer. For example, Changchun Mickey and Xintai M. punctatus can be selected for the cultivation of cucumber in spring, and Jinyan No. 4 for resistance to downy mildew can be selected for autumn cultivation. , Jinchun No. 4, Jinchun No. 3 and other varieties. When pests and diseases are controlled, 0.2% to 0.3% of potassium dihydrogen phosphate solution may be sprayed on the leaves of fruit vegetables, melon vegetables, and legumes in combination with pesticide application to increase the disease resistance of the plants. The correct application of nitrogen fertilizers has different types of vegetables, and the amount and usage of nitrogen fertilizers are also different. Vegetables such as spinach, cabbage, and lettuce tend to accumulate large amounts of nitrate, and nitrate-nitrogen fertilizers should be forbidden. For fruit vegetables and root vegetables that do not easily accumulate nitrates, the amount of nitrate nitrogen fertilizer and the number of applications must be strictly controlled during production, and the application should be stopped 30 days before harvest. Nitrogen fertilizer should be applied early and deep so as to reduce the accumulation of nitrates and at the same time minimize the amount of nitrogen fertilizer. When applying ammonium nitrogen fertilizer to leafy vegetables, the amount per mu of land must not exceed 30 kg, and foliar spraying is strictly prohibited. In vegetable production, the season of cultivation varies, and the use of nitrate nitrogen is also different. Under normal circumstances, the cultivation of vegetables in the hot season, you can apply a small amount of nitrate nitrogen fertilizer, but in the cold season cultivation of vegetables should be banned from applying nitrate fertilizer. Organic manure as the base fertilizer as much as possible to apply organic fertilizer, and the main application of base fertilizer, can improve the physical and chemical properties of the soil, promote robust growth of plants, improve disease resistance. In addition, it should be pointed out that spraying pesticides on vegetables should use microbial pesticides as far as possible, and Beauveria bassiana, 7216, HD-1, Helicobacter pylori 6, BT emulsion, and cotton bollworm virus are suitable for use on vegetables. Agent and so on. The use of highly toxic, highly toxic, and high residue pesticides, such as 1605, 1059, 3911, carbofuran, methamidophos, insecticidal fleas, toxaphene, Xilisheng, and Saili Powder, is strictly prohibited. The following pesticides may be used ( Recommended for the Ministry of Agriculture: 25% dimehypo, 90% crystal trichlorfon, 40% dimethoate, 80% dichlorvos, 50% phoxim, 25% marathon, 20% extinction, 20% cypermethrin, 25 % deltamethrin, 25% ciprofloxacin, 50% carbendazim, 65% dexamethasone, 70% chlorothalonil, 25% vancomycin, Bordeaux mixture, etc. Pesticide spraying should be carried out strictly in accordance with its safety intervals, and its use frequency, concentration and dosage should be controlled.
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