Lettuce not only has a crisp and delicious taste, but also has more nutrients. In recent years, with the continuous expansion of market demand, more and more people grow lettuce. When growing lettuce, they want to improve its Yield, then there is a very critical factor, and that is to do a good job of fertilization.

1. The fertilizer requirements of lettuce

When lettuce grows, it mainly needs NPK fertilizer. The seedling stage has a great demand for nitrogen fertilizer, followed by phosphate fertilizer, and there is less demand for potassium fertilizer. In the peak season, the demand for phosphorus and potassium fertilizer increases, and a large amount of nitrogen fertilizer is also needed for growth. Nitrogen fertilizer is at its peak at this time; in the middle and late stages of growth, when the lettuce starts to head, the demand for nitrogen fertilizer gradually decreases and the demand for potassium fertilizer reaches its peak. According to research, lettuce needs to absorb 0.37 kg of pure nitrogen, 0.14 kg of phosphorus and 0.33 kg of potassium for every 100 kg of lettuce. In addition to nitrogen, phosphorus and potassium fertilizers, it also needs boron, iron, copper, magnesium, zinc, molybdenum, etc. Trace elements, these elements have an extremely important effect on them, are indispensable, otherwise, the production will be reduced, and the quality will be affected.

2. Apply foot fertilizer

Base fertilizer can continuously improve the nutrients needed for production and growth for a long time, so it is recommended to use a large amount of decomposed organic fertilizer for base fertilizer, which can increase the content of trace elements in the soil, improve the soil structure, and avoid the symptoms of nutrient deficiency during planting. However, the fertilizer effect of organic fertilizer is slow, so when fertilizing, it should be combined with chemical fertilizer to make the lettuce grow fast. Apply 1000-2000 kg of organic fertilizer per mu, and use about 100 kg of compound fertilizer. Spread it evenly on the ground, combine with land preparation and tilling to make it evenly mixed with the soil.

3. Topdressing timely

According to the different stages of lettuce growth, timely and reasonable topdressing can speed up its growth and development. In order to make lettuce emerge and grow quickly in the seedling stage, apply 8-10 kg of nitrogen fertilizer per acre at this time, and then apply 1-2 kg of phosphorus and potassium fertilizer. When applying it, mix with water to prevent the roots of the seedlings from being affected by concentrated fertilizer. damage. In the peak growing season, when there is a lot of demand for nitrogen and potassium fertilizers, 11-14 kilograms of urea and 8-9 kilograms of potassium sulfate are usually applied per mu. When it comes to the filling period, lettuce has more demand for potassium fertilizer, but less nitrogen fertilizer. Generally, 11-14 kg of urea, 8-9 kg of potassium sulfate or 45% high-nitrogen-potassium compound fertilizer are applied per mu. -25 kg.