Nowadays, the problem of continuous cropping of vegetables in protected areas has increasingly become the most difficult problem in production. Many vegetable fields have reduced their yields or even eliminated them due to heavy cropping. In particular, physiological diseases of vegetables have been increasing year by year. How to reduce or even avoid the harm caused by re-enlightenment? Practices show that intercropping is good.
First, repeat the disease symptoms
Generally, it is characterized by plant dwarfism, underdeveloped root system, stiff seedlings, old seedlings, rot roots, bacterial wilt, blight, verticillium wilt, root rot, root knot nematode disease and other soil-borne diseases. Plant trace elements are lacking. The output is obviously reduced and the quality is poor.
Second, the reasons for the occurrence of severe caries
Firstly, due to the accumulation of pathogenic microorganisms in the soil year after year, soil-borne diseases and pests are gradually aggravated; second, the same vegetation has been planting the same vegetable for many years, resulting in the lack or imbalance of nutrients preferred by the vegetables in the soil; The toxic substances produced during the decomposition of secretions and diseased bodies cause poisoning and growth inhibition to the vegetables in the lower jaw.
III. Intercropping and interplanting methods
Through practice, it has been proved that intercropping intercropping is a direct, effective, and low-cost method for replanting crops, and vegetable farmers can use the following methods to intercropping and intercropping.
1. The phenomenon of dead seedlings, black heart, poor growth and development, etc. often occurs in radish-heavy pods in winter and spring greenhouses. It can be sown at the same time as the seeds of pods that promote germination in winter and spring greenhouse water radish sprouts, before and after the Spring Festival. The planted water radish can be sown simultaneously with garland chrysanthemum, which can effectively reduce the above-mentioned undesirable phenomena.
2. The phenomenon of dead seedlings and dry pods often occurs in the cucumber barn plots, which can be solved by means of intercropping or rotation of cucumber and garland chrysanthemum.
3. The phenomenon of dead seedlings and rotten seedlings appears in the heavy garlic sprouts. When growing garlic in the fall, a small amount of spinach seeds are sown in the garlic line. Before and after the Spring Festival, the spinach is gradually pulled out and put on the market. This will not affect the production of garlic, but also reduce the occurrence of dead seedlings, rotten seedlings and other phenomena caused by double weighting.
4. Rotation of eggplant or tomato and Artemisia ordosica can reduce the incidence of eggplant and tomato diseases.
5. Green peppers, tomatoes, Chinese cabbage and corn intercropping can reduce aphids to move and transfer poisons, and play a role in avoiding plague and preventing disease. Shading the corn to improve the field microclimate to reduce the temperature, is conducive to the development of green pepper roots, enhance disease resistance at seedling stage.
6. Rotation of vegetables and cereal crops, such as potato black stem disease can not infect wheat, rotation for three years have better disease prevention.
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