Lettuce is a common vegetable in our life. It is an annual or biennial herbaceous crop. It can be directly eaten raw, crisp and refreshing, slightly sweet. In recent years, with the expansion of market demand, its planting area is also rapidly expanding. Fertilization is a key point in order to increase production when planting. Let's take the fertilization technique of lettuce together.
1, fertilizer characteristics
When growing lettuce, it mainly needs NPK fertilizer. The demand for nitrogen fertilizer is very high at seedling stage, followed by phosphate fertilizer and less potassium fertilizer. When the growth season is high, the demand for phosphorus and potassium fertilizer increases, and a large amount of nitrogen fertilizer is needed for growth. Nitrogen fertilizer is the peak period at this time; in the middle and late growth stages, when the lettuce begins to bear the ball, the demand for nitrogen fertilizer is gradually reduced, and the demand for potassium fertilizer reaches its peak.
According to research, it is necessary to absorb 0.37 kg of pure nitrogen, 0.14 kg of phosphorus and 0.33 kg of potassium for each 100 kg of lettuce. In addition to NPK, it also needs boron, iron, copper, magnesium, zinc, molybdenum, etc. Trace elements, which have an extremely important role, are indispensable, otherwise they will reduce production, affect quality, and in large numbers die, resulting in no harvest.
2, apply enough base fertilizer
The base fertilizer can continuously increase the nutrients needed for production and growth for a long time. Therefore, it is recommended to apply a large amount of decomposed organic fertilizer to the bottom fertilizer, which can increase the content of trace elements in the soil, improve the soil structure, and avoid the symptoms of deficiency during planting. However, the fertilizer efficiency of organic fertilizer is slower. Therefore, when applying fertilizer, it is necessary to mix quick-acting fertilizer to make lettuce grow fast. Apply 1000-2000 kg of organic fertilizer per acre, and mix it with about 100 kg of compound fertilizer. Spread it evenly on the ground and mix it with the soil to mix it with the soil.
3, timely topdressing
According to the different stages of lettuce growth, timely and reasonable topdressing, speed up its growth and development. In the seedling stage, in order to make the lettuce grow quickly, at this time, apply 8-10 kg of nitrogen fertilizer per acre, and apply 1-2 kg of phosphorus and potassium fertilizer. When the application is best, it should be poured with water to avoid the thickening of the seedlings. The root system is damaged. At the time of the rose season of the growing season, there is a greater demand for nitrogen and potassium fertilizer. Generally, 11-14 kg of urea and 8-9 kg of potassium sulfate are applied per mu, and the effect of molar water-soluble fertilizer can be selected.
At the time of the package, the lettuce has more demand for potash, and the nitrogen fertilizer is less. Generally, 11-14 kg of urea per mu, potassium sulfate 8-9 kg or 45% high nitrogen and potassium compound fertilizer 20 ~25 kg, can also be applied with high-nitrogen potassium water-soluble fertilizer, 5 kg of water per acre.
4, fertilization matters needing attention
The water-soluble fertilizer is generally selected by adding 5 kilograms of molar water-soluble fertilizer to 1000 kilograms of water to be dissolved and dissolved, and then dredging or slowly pouring water to make it evenly distributed. In addition, lettuce is a leafy vegetable, which is different from melon and fruit vegetables, and has little demand for fertility. Therefore, attention should be paid to the amount of application when fertilizing, and the specification operation should be carried out in strict accordance with the instructions. (黔农网)
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