First, the demand for different types of fertilizer: such as vegetables, spinach and other leafy vegetables need more nitrogen, melons, tomatoes, peppers and other fruit species need more phosphorus, potato, yam and other roots need more potash, they take turns cultivation, Can make full use of various nutrients in the soil.
Second, the depth of the root is different: If the deep-rooted eggplant, melon, beans with shallow-rooted cabbage, onion garlic category rotation, can make different levels of fertilizer in the soil can be used.
Third, non-infectious diseases and insect pests: different types of crop rotation, can change the living conditions of pests and diseases, to reduce pests and diseases. For example, food crop rotation and crop rotation can control soil-borne diseases.
Fourth, to improve the soil structure: legumes and rhizobium bacteria fixed nitrogen, can increase fertility, and then can be planted more nitrogen required cabbage, eggplant, etc., and then planting less need for nitrogen onions and garlic.
V. Different vegetables have different requirements for soil pH: After growing vegetables such as cabbage and potatoes, the acidity of the soil can be increased. After pumpkins and sweet corn are planted, the acidity of the soil can be reduced. Therefore, onions that are sensitive to soil acidity are used as pumpkins. The yield can be increased, and the onion is reduced as a post-cooked meal.
In addition, the rotation period of various vegetables is also different, such as cabbage, celery, cabbage, cauliflower, onions and garlic, etc. in the land without serious disease can be made several consecutive, but the need to increase the base fertilizer. There are watermelons that need to be cultivated every 1-2 years; potatoes, yams, ginger, cucumbers, and peppers that need to be cultivated every 2-3 years; tomatoes, taro, eggplants, melons, peas, cultivars must be grown every 3-4 years. Chinese cabbage and so on.
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