The onion yields over 10,000 tons of fertilization.

In recent years, some vegetable farmers have increased the use of nitrogen fertilizers by blindly increasing the use of nitrogen fertilizers. However, the application of potassium fertilizers is rare or not applied. As a result, the yield of green onions does not increase and the root rot is aggravated. Experts advise: excessive application of nitrogen fertilizer on the onion and seldom application of potassium fertilizer, it is easy to lead to nitrogen and potassium nutrition imbalance of the onion. In recent years, the “Green Onion Nitrogen and Potassium Fertilizer” fertilization technology implemented by an agricultural technology center has increased the yield of green onion by an average of more than 20% per 667 square meters. It has received obvious results. The specific fertilization methods are as follows:

1. Matching coordination

The yield of stalks per 667 square meters is 3,000-6,000 kilograms, which is high yield. The ratio of high-yield green onions to nitrogen, phosphorus and potassium nutrients is about 1:0.4:1.3. Therefore, in the proportion of fertilization, we must pay attention to the balanced supply of potash. The specific amount of potassium applied depends mainly on three aspects: one is the ability of the soil itself to supply potassium, for example, the ability of potassium in sandy soil is low, and the amount of potassium used should be increased appropriately;

The second depends on the target yield of the green onion. Under the high yield level, if the output per 667 square meters exceeds 10,000 jin, the amount of potassium that the green onion produces from the soil will be increased. Therefore, the potassium fertilizer will increase accordingly; The amount of other fertilizer application, such as the amount of straw returned to the field, the amount of nitrogen fertilizer applied, if a large amount of organic fertilizer is invested, the potassium fertilizer can be applied less, especially the amount of nitrogen fertilizer should be appropriate, and it should be balanced with the corresponding potassium fertilizer to have a good yield increase effect. .

Otherwise, blind investment will not only benefit the high yield of green onions, but also cause the quality of green onions to decline, such as small proportion of onion, leaf, no onion, and even bitterness.

2, the right amount of application

Generally, the amount of nitrogen fertilizer recommended for green onion is about 20 to 26 kilograms per 667 square meters of pure nitrogen. Too much nitrogen fertilizer, coupled with large watering, not only wastes nitrogen fertilizer, increases production costs, but also produces large onions that are not resistant to storage. The quality is degraded, and the nitrogen loss will have a negative effect on the environment. Therefore, the amount of nitrogen fertilizer should be appropriate. The most common type of nitrogen fertilizer is urea, but the most suitable nitrogen fertilizer is ammonium sulfate, because the green onion is a sulfur crop.

3, pay attention to methods

There are also some emphasis on the fertilization method of green onions. The whole process of fertilization should be divided into two parts: base fertilizer and topdressing. In the base fertilizer, it is best to apply 4,000 to 5,000 kilograms of decomposed high-quality organic fertilizer per 667 square meters. When the land is prepared, the ground is applied and ploughed into the soil.

Fertilizer base fertilizer should be applied to all phosphate fertilizer, 40% nitrogen fertilizer and 60% potassium sulfate fertilizer, and the variety can be compound fertilizer or single fertilizer. When selecting a compound fertilizer, a sulfur-based general-purpose type or a special-purpose type may be selected, which is not suitable for a high-nitrogen type compound fertilizer. The fertilization depth of the base fertilizer must be about 15 cm.

The top dressing of the green onion can be carried out in 2 or 3 times, and the remaining 60% nitrogen fertilizer and 40% potassium fertilizer of the base fertilizer are applied as top dressing in the middle stage of the leaf stage and the onion formation stage, respectively. The method of top dressing has the best effect of water and fertilizer blending. Avoid large water and large nitrogen flushing. Otherwise, not only will the fertilizer utilization rate be low, but also urea will be scattered on the surface in summer, and nitrogen volatilization will easily cause smoked leaves to burn. (China Agricultural Materials Media)

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