1. Timely topdressing Chinese cabbage is a product with leaves, which is sensitive to the requirements of nitrogen, phosphorus and potassium. In the production, not only the base fertilizer should be applied, but also the topdressing according to different growth periods. Most of the fertilizers in the growth period are mainly available nitrogen fertilizers, such as ammonium sulfate, ammonium hydrogencarbonate, ammonium phosphate and urea. The topdressing period should be mastered, generally in the seedling stage, the rosette period, the beginning of the ball and the mid-balling period. In the seedling stage, 5 to 10 kilograms of ammonium sulfate is applied per acre, and 1000 to 1250 kilograms of fermented farmyard manure, 15 kilograms of ammonium bicarbonate or 10 kilograms of ammonium sulfate per acre, and 25 kilograms of ammonium bicarbonate per acre. Ammonium sulfate 15 ~ 20 kg, in the middle of the ball in the middle of the season, apply 1000 ~ 1250 kg of diluted manure, 10 ~ 15 kg of ammonium carbonate or 1% urea solution.
2, pests and diseases should be treated concurrently Vegetable farmers pay great attention to the prevention and control of the three major diseases of Chinese cabbage, but often ignore the prevention and control of pests. In fact, many diseases spread and are inextricably linked to pests. Aphids are the chief culprit in the spread of viral diseases, which can cause cabbage to die and die; soft rots are mainly transmitted by insects, rainwater and irrigation water, and are infected with cabbage from wounds. The pest causes damage after the wound, which is conducive to the invasion of the disease. Prevention and control of cabbage caterpillars, yellow bells and armor and underground pests, reducing pest wounds, can effectively reduce the occurrence of soft rot of Chinese cabbage. Therefore, the control of pests is also an important measure to prevent and treat diseases.
3, the bundle should be postponed Bundling can prevent the cabbage from suffering frost, promote the heart, and easy to harvest. However, the binding cannot be premature, because the binding is too early, the photosynthetic efficiency of the outer leaves is greatly reduced, hindering the normal growth of Chinese cabbage, and is not conducive to the filling of the leaf ball. Generally, 10 to 15 days before harvest, stop watering, lift the rosette leaves, hold the leaf ball, and then use the saturated sweet potato or cereal grass to tie the leaves 3 to 5 cm from the top of the ball to make the heart more Solid and continue to grow.
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