The veteran who grows onions should be able to understand that onion is a kind of vegetable that is good for fat, and absorbs more nutrients. Among them, potassium is the main factor, and nitrogen has a great influence on the growth of onion. Today, Xiaobian and everyone study an onion fertilization technology.
Onion fertilization can be divided into two parts, namely base fertilizer and top dressing. In the production process of onion, the principle of fertilization is to stage, multiply, and balance the fertilization of nutrients (the trace elements should pay attention to such as boron).
First, the base fertilizer
Seedbed: Nitrogen, phosphorus, potassium, and boron are used as base fertilizer once.
Daejeon: 1/3 of the nitrogen fertilizer required for onion after planting can be used as the application amount of the base fertilizer, and the remaining 2/3 is used as the top dressing;
Phosphate fertilizer can use 2/3 as the tomb, and 1/3 as the top dressing; potassium fertilizer can be used as the base fertilizer; the trace element holding boron is applied 200g per mu.
Second, top dressing
Onion seedlings should not be too large to avoid premature convulsions, so the base fertilizer is sufficient, and the seedling period is generally not topdressing. If the seedlings grow very thin, watering can be combined with about 3 kg of urea per acre to promote seedling growth to enhance wintering ability.
After the onion is planted, it is necessary to stage the appropriate amount of topdressing. After returning to green, combined with watering to apply 1 time fertilizer, promote leaf growth, generally 800-1000 kg per mu of fertile and dilute faecal fertilizer, and phosphate and potassium-deficient fields should be applied with superphosphate and ash.
Fertilizer: Generally, 800-1000 kg of fertilized and diluted manure per mu, or 10 g of urea per acre. Primer: The bulb expansion period is a key period for fertilization. It should be topdressed 1 or 2 times. Generally, about 1000 kg of lean manure can be applied per mu or about 15 kg of urea. The second time depends on soil fertility and onion growth. .
The role of trace element boron can not be ignored, the onion is deficient in boron: the new leaves are chlorotic deformed, the texture becomes brittle; the trapezoidal crack occurs in the sheath part; the bulb is loose, and heart rot occurs in severe cases. In the boron-deficient area, boron production increases the yield and improves the quality. The effect is obvious, but the boron supplement should choose high-quality boron fertilizer. At present, there are imported boron and quick-lean boron imported from the United States, and the effect of boron supplementation is very good, which is very popular among farmers. for reference only.
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