The Fertilizer Management Characteristics of Cabbage
(1) Root absorption characteristics: Brassica is a shallow root crop. Roots have main roots, lateral roots, and well-developed root hairs. Most of the whole root system stretches in the top soil layer above 25 cm. Young roots have strong regeneration ability. Therefore, it is suitable for transplanting.
Cabbage has a strong adaptability to soil, but it requires fertile soil, ventilated drainage, and good loam retention. It is suitable for neutral soil and also has a certain adaptability to slightly acidic and slightly alkaline soils. Cabbage has strong salt tolerance, and it can still function normally on saline-alkaline soil with 0.75% to 1.2% salinity. In the early stage of growth, nitrogen fertilizers are mainly used, and a certain amount of phosphorus and potassium fertilizers are required in the later growth stage. Cabbage should be planted with melons, beans, and solanaceous vegetables. It must not be used in conjunction with cruciferous vegetables to prevent serious disease.
(2) Fertility requirements: Cabbage is a fertilizer-favorable fertilizer crop that absorbs more nutrients than normal vegetables. In the seedling stage, rosette stage and bulbous stage, the uptake of fertilizer was the same as that of Chinese cabbage. In the first half of growth, the absorption of nitrogen was more, reaching a peak at the rosette stage. Leaf ball formation absorbs more phosphorus, potassium, and calcium. The nodule period is a period of large absorption of nutrients, and absorption of nitrogen, phosphorus, potassium, and calcium during this period can account for 80% of the total fertility absorption. After planting, the absorption of nitrogen, phosphorus, and calcium reached a peak around the 35th day, and the absorption of potassium peaked around 50 days. Generally absorb more nitrogen, potassium, calcium, less phosphorus. The production of 1,000 kilograms of cabbage requires about 3.0 kg of nitrogen, 1.0 kg of phosphorus, and 4.0 kg of potassium, and the ratio is 3:1:4. Therefore, on the basis of increasing nitrogen fertilizer, phosphorus, potassium, and calcium fertilizers should be applied to make it tight and the net food rate is high.
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