When is the best time to fertilize vegetables? How often do you apply fertilizer? How many days can I eat after fertilizing?

Vegetables are one of the indispensable foods in people's daily diet. Vegetables can provide a variety of vitamins and minerals and other nutrients necessary for the human body. So when is the best time to fertilize vegetables? How often do you apply fertilizer? How many days can I eat after fertilizing?

When is the best time to fertilize vegetables?

Fertilizer can be divided into base fertilizer, seed fertilizer and topdressing fertilizer according to different application periods, purposes and methods.

Fertilizer applied to the soil in combination with soil tillage before sowing or transplanting. It is usually dominated by organic fertilizers. Its function is to fertilize the soil and provide nutrients throughout the plant growth period. In order to give full play to the role of base fertilizer, different application methods such as spreading fertilizer, strip application and layered fertilization are often adopted according to soil characteristics, tillage methods and fertilizer properties.

Fertilizer applied near or mixed with seeds during sowing or planting. The aim is to provide nutrients for the growth of seedlings. In China, there are many ways to apply seed fertilizer: sowing seeds after mixing fertilizer with plant seeds, sowing plant seeds with thin fertilizer solution, soaking seeds, soaking roots in fertilizer mixed with mud, called dipping seedling roots; plant seeds are covered with soil dung and charred mud ash after sowing, which is called seed fertilizer.

Fertilizer applied during plant growth. It is designed to supplement and meet the nutrient demand of plants during their growth. It is usually dominated by the application of quick-acting chemical fertilizers and mature organic fertilizers. The main ways of topdressing are spreading, ring application, spraying and so on. The combination of sprinkler irrigation and drip irrigation has the advantages of labor saving, fertilizer saving and good effect. The fertilizer suitable for irrigation and fertilization is mainly nitrogen fertilizer. Phosphate fertilizer is not suitable because it is easy to react with salts in irrigation water to form insoluble compounds and block the holes of sprinkler mouth.

How often do vegetables apply fertilizer?

Generally speaking, you can top dressing every 7-15 days. Topdressing is usually more frequent in the vigorous growth period and less in the seedling stage and near maturity.

Vegetables can not be eaten until a few days after applying compound fertilizer.

Compound fertilizer mainly contains elements such as nitrogen, phosphorus and potassium, and the proportion of nutrients is different in different varieties. It is usually used as base fertilizer and applied with water in the later stage of vegetable growth. After applying compound fertilizer, the content of nitrite in vegetables, especially in leafy vegetables, is relatively high, which will decrease after about 10 days after the fertilizer effect is released, and the time of harvest in the morning is that night, which can also reduce the content of nitrite in vegetables, but the higher leaf temperature is not conducive to the storage of vegetables.