1. Add a large amount of decomposed organic fertilizer. Especially for cooked vegetables, it is advisable to stop using chemical fertilizers and a single nitrogen fertilizer.
2. Persist in applying organic fertilizers such as plant straw, manure and human and animal manure throughout the year to improve the agglomerate structure of the soil and make the water, fertilizer, gas and heat significantly coordinated. The acidified or alkalized soil should be modified. In addition to the application of organic fertilizer, moderate fertilizer should be applied in an appropriate amount. For example, the soil is acidic and can be neutralized by lime or grass ash. The soil is alkaline and can be applied with ammonium sulfate or superphosphate. Calcium regulation to improve the acidification properties of the soil.
3. Implement reasonable rotation of different vegetables. Whether it is lettuce or cooked vegetables, it is not advisable to plant the same vegetables on the same vegetable field for several consecutive times. It should be repeated for a long time.
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