Latest Management Methods for Winter Greenhouse Lettuce

Lettuce is a fairly common vegetable in daily life, and it is basically grown all over our country. Now, because growing techniques are becoming more and more mature, lettuce can also be grown in winter. Winter lettuce cultivation is generally based on greenhouse cultivation, and growing lettuce in greenhouses in winter requires us to do a good job of management. So how should winter greenhouse lettuce be managed? Let's take a look together with the editor below!

1. Temperature and humidity management

When growing greenhouse lettuce in winter, the first thing we must do well is temperature and humidity management. Especially in the early stage after lettuce is planted, ventilation and dehumidification should be done according to the actual conditions inside the greenhouse. At night, if the temperature is above zero degrees, ventilation can be done appropriately, but it must never be below zero degrees; if it is below zero degrees, small arched sheds and straw curtains should be added. During the day, the straw curtains can be uncovered. After the lettuce stem begins to expand, the daytime temperature inside the greenhouse should be controlled at around 18 degrees; if it exceeds 25 degrees, ventilation should be carried out in time, and the nighttime temperature should also be kept above 5 degrees.

2. Fertilizer and water management

Then we must do a good job of fertilizer and water management, as fertilizer and water are the key to ensuring that lettuce overwinters safely. Likewise, after lettuce is planted, water once to settle the roots, then after about a week, water once again to help the seedlings recover. Also apply a seedling-promoting fertilizer with the water, applying an appropriate amount of ammonium sulfate per mu. Then carry out about three rounds of cultivating and loosening the soil, and during the rosette stage of lettuce, also apply fertilizer once with the water. When the lettuce stem enters the expansion stage, do a good job of watering and apply an appropriate amount of compound fertilizer as a top dressing, and then the soil should be slightly moist.

3. Pest and disease control

Although the temperature is lower in winter, the activity of pathogens and pests will be relatively low. However, we still need to do a good job of pest and disease control, because if management is improper, pests and diseases may still occur in winter. Pest and disease control should focus on prevention, which includes temperature and humidity management. Improper temperature and humidity are the main causes of pest and disease outbreaks, so everyone should pay close attention. We should often observe the growth of lettuce and reasonably use agents such as metalaxyl, procymidone, or carbendazim for control. After disease occurs, the cause should be identified in time, and then targeted treatment should be carried out.

4. Timely harvesting

If it needs to be marketed in winter, then we also need to do a good job of harvesting. The harvest standard for lettuce is when the heart leaves are level with the outer leaves, because at this time the lettuce is basically already mature. The taste is also very good, and the quality is relatively excellent. If harvesting is too late, the lettuce will remain in a state of continued growth. Continued growth will lead to an increase in crude fiber inside the lettuce, a worse taste, and therefore a decline in quality. And if it cannot be marketed in time, then the lettuce should have its tips pinched and buds removed to inhibit the growth of the tender stems.

The above is a brief introduction to how to manage winter greenhouse lettuce. That is all for today's introduction. This article is for reference only, and I hope it can help everyone!