According to the test, for every 100 kilograms of cabbage produced, about 150 grams of nitrogen, 70 grams of phosphorus pentoxide, and 200 grams of potassium oxide. In the case of 5,000 kilograms of vegetable produced per mu, about 7.5 kilograms of nitrogen, 3.5 kilograms of phosphorus pentoxide, and potassium oxide. 10 kg. The approximate ratio of them is nitrogen: phosphorus pentoxide: potassium oxide = 1:0.47:1.33, and the most absorbed potassium oxide is observed, followed by nitrogen and phosphorus pentoxide.
The absorption of the three elements in each growth period is also different, from the germination period to the rosette period, only about 10% of the total absorption, while the absorption during the ball-forming period is 90%, and the proportion of the three elements absorbed in each period is also different. Nitrogen is most absorbed from the germination stage to the rosette stage, followed by potassium oxide and phosphorus. The potassium oxide absorbed during the ball-forming period was the most, followed by nitrogen, and phosphorus pentoxide was still the least.
Specific fertilization methods:
1. Applying organic fertilizer Generally, the organic fertilizer is applied in the range of 3,000 kg to 5,000 kg, and the old vegetable is strong and the application is less, and the new vegetable is weak.
2. Skillfully applying seedling fertilizer The growth of the plant during this period is still not large, only 0.41% of the whole period, and the growth rate is still very fast, increasing by 2.39 times per day. In order to ensure that the seedlings get enough nutrients, it is necessary to apply the quick-acting fertilizer “lifting seedling fertilizerâ€, and the fertilizer for the seedling fertilizer is 5 kg to 6 kg per mu. When applying fertilizer, the seedlings and weak seedlings should be biased to promote the formation of strong seedlings.
3. Reasonable topdressing It is necessary to grasp the seedlings of the seedlings and start to enter the rosette period and start the top dressing twice before the start of the package. It is the key to ensure the high yield of Chinese cabbage. This section of Chinese cabbage is in the rapid growth period, should increase the amount of topdressing, mainly nitrogen fertilizer, nitrogen fertilizer and phosphorus and potassium fertilizer, and the spraying of 1% potassium dihydrogen phosphate solution twice or three times on the leaf surface can increase the vegetable yield.
4. Re-application of potassium fertilizer Re-application of potassium fertilizer can enhance the disease resistance and storability of Chinese cabbage. Generally, potassium fertilizer such as 15 kg of potassium chloride or 20 kg of potassium sulfate can be applied, and ash can also be applied.
In addition, the application of a small amount of calcium and boron fertilizer will also make the cabbage good and improve the quality.
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