First, cabbage vegetables

These vegetables have large leaf areas and large transpiration, but the roots are shallow, requiring high soil water content and fertility. This type of vegetable is increased in yield by increasing the number of leaves and leaf area. Therefore, it is especially important to supply sufficient nitrogen. If the supply of nitrogen is insufficient, the plants are short, the leaves are few, the leaves at the base of the stem are easy to wither and yellow, and the tissues are thick and hard. Too much nitrogen, high water content in the side tissue, is not conducive to storage, and is susceptible to disease. In the later stage, when the supply of phosphorus and potassium is insufficient, it is often difficult to form a ball.

Second, cabbage vegetables

Such vegetables include cabbage, broccoli, broccoli and Brussels sprouts. Cabbage has a limited amount of nitrogen, phosphorus and potassium absorption before the ball-forming period, and after entering the ball-forming period, the nutrient absorption increases rapidly due to the large increase in growth. The nitrogen, phosphorus and potassium nutrients of broccoli are the most absorbed. Only by ensuring the coordinated supply of N, P and K in the long term can the high yield and quality of cabbage vegetables be guaranteed. Another cabbage-like vegetable is a typical calcium-loving crop. When the soil is deficient in calcium and forms physiological calcium deficiency, it causes the edge of the leaf to dry up, affecting yield and quality.

Cauliflower is sensitive to boron. When boron is deficient, it may cause cracking of petiole or lobule, and the center of flower stem is cracked. The flower ball has brown spots and slightly bitter taste. The solution is to use the “new boron” fertilizer leaf spray. At the same time, according to the abundance of soil element content, molybdenum, zinc and iron fertilizer are applied in time.

Third, green leafy vegetables

Such vegetables include spinach, lettuce, celery, alfalfa, lettuce, and fennel. These vegetables have shallow roots, rapid growth, and high planting density. Therefore, the requirements for fertilizer and water conditions are high. Their nutritional characteristics are: when N is sufficient, the leaves are tender and juicy and less fiber; when N is insufficient, the plants have more short fibers, less leaves, yellowish and rough, easy to smoke early, and lose edible value.

Fourth, onion and garlic vegetables

Such vegetables include leeks, garlic, green onions, and onions. The nutrient requirements of these vegetables are generally N, with appropriate P and K fertilizers. For onions and garlic, focus on controlling N, increase P, K, promote onion swelling, garlic bolting; for leeks, reapply N fertilizer to promote vigorous growth and ensure the production of squat.

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