Nutritional characteristics and fertilization characteristics of vegetables

1. Cabbage vegetables

This kind of vegetable has large leaf area and transpiration, but its root system is shallow, which requires high soil water content and fertility. The yield of these vegetables is increased by increasing the number of leaves and leaf area, so it is particularly important to supply adequate nitrogen. If the nitrogen supply is insufficient, the plant is short, the leaves are few, the leaves at the base of the stem are easy to wither, yellow and fall off, and the tissue is thick and hard. Too much nitrogen, high water content of lateral tissue, not conducive to storage, and vulnerable to diseases. In the later stage, when the supply of phosphorus and potassium is insufficient, it is often not easy to form balls.

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These vegetables include Brussels sprouts, broccoli, Brussels sprouts and Brussels sprouts. Due to the limited growth before the heading stage, the cabbage absorbed less nitrogen, phosphorus and potassium, but after entering the heading stage, due to the great increase in growth, the nutrient uptake increased rapidly. Cauliflower absorbs the most nitrogen, phosphorus and potassium nutrients, and 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 ensured. In addition, cabbage vegetables are typical calcium-loving crops, when the soil is deficient in calcium and the plant is physiologically deficient in calcium, it causes leaf edge dryness and affects the yield and quality.

Cauliflower is sensitive to boron. When boron is deficient, it is easy to cause petiole cracking or leaflet and flower stem center cracking, and the rosette appears brown spots and slightly bitter taste. The solution is to choose "new boron" fertilizer for foliar spraying. At the same time, according to the abundance and deficiency of soil elements, timely book application of molybdenum, zinc and iron fertilizer.

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These vegetables include spinach, lettuce, celery, coriander, lettuce, fennel and so on. This kind of vegetables have shallow roots, rapid growth and high planting density, so they have high requirements for fertilizer and water conditions. Their nutritional characteristics are that when N is sufficient, the leaves are tender, juicy and less fiber; when N is insufficient, the plant has more dwarf fiber, less leaves, yellow and rough color, easy to pick moss early and lose edible value.

? 4. Onion and garlic vegetables

These vegetables include leeks, garlic, onions, onions and so on. The nutrient requirements of these vegetables are generally N-based, with appropriate P and K fertilizer. For onion and garlic pay attention to control N, increase P, K, promote onion expansion, garlic bolting; for leek should be re-application of N fertilizer to promote exuberant growth and ensure the yield of the next crop.