High-yield fertilization technology for scallion
Reasonable fertilization is the key to high yield of scallion, so how to fertilize scallion to achieve high yield?
1. If a large amount of organic fertilizer is applied, you can apply less potassium fertilizer. In particular, the amount of nitrogen fertilizer should be appropriate, and it should be applied in balance with the corresponding potassium fertilizer to have a good yield increase effect. Otherwise, the blind application of chemical nitrogen fertilizer is not only not beneficial to the high yield of scallion, but also will cause the quality of scallion to decline, such as the small proportion of scallion, many leaves, and the taste of scallion is not strong, and even has a bitter taste. In terms of the proportion of fertilizer, attention should be paid to the balanced supply of potassium fertilizer. Especially under the conditions of high-yield cultivation and no organic fertilizer, more attention should be paid to the supplemental application of potassium fertilizer. Seaweed extract flake Algamas which contains a certain rate of potassium can be consider.
2. Generally, under the high yield level of scallion, the recommended amount of nitrogen fertilizer is about 667 square meters 1/15Ha, and 20-26 kg of pure nitrogen is applied. Too much partial nitrogen fertilizer, coupled with a large amount of watering, not only wastes nitrogen fertilizer and increases costs, but also produces scallion that are not resistant to storage, deteriorate in quality, and will have a negative effect on the environment due to nitrogen loss. Therefore, the amount of nitrogen fertilizer should be appropriate, in the selection of nitrogen fertilizer varieties, the most common is urea, but the most suitable nitrogen fertilizer variety is ammonium sulfate, because scallion are sulfur-loving crops.
3. Fertilization method
The whole process of fertilization of scallion is divided into two parts: base fertilizer and top dressing. At present, the base fertilizer of the place where scallion should be planted is the best 667 square meters, apply 4000-5000 kg of well-decomposed high-quality organic fertilizer, spread it when preparing the land, and plough it into the soil; The base fertilizer of chemical fertilizer should be applied with all phosphate fertilizer, 40% nitrogen fertilizer and 60% potassium sulfate fertilizer, and the variety can choose compound fertilizer or simple fertilizer. When selecting compound fertilizers, sulfur-based general-purpose or special types can be selected, and high-nitrogen compound fertilizers should not be applied.
The depth of application of base fertilizer must be about 15 cm. The top dressing of scallion can be carried out in 2-3 times, and the remaining 60% nitrogen fertilizer and 40% potassium fertilizer will be applied in the early and middle stages of the full leaf stage and the green onion white formation stage, respectively. The method of top dressing: the effect of water and fertilizer integration is good, and it is necessary to avoid the application of large water and nitrogen, otherwise, it will not only cause low fertilizer utilization rate, but also sprinkle urea on the surface in summer, and nitrogen volatilization will also cause smoked leaves and seedlings.