Recently, when Ni Yutian, a vegetable trader in Weiyuan County, took lettuce from the side of Laichang Village of Liuchanghu, Xinchang Town, he picked up a bundle and said, "Lao Liu, you have burst out of lettuce. “Liu Chenghu said:†The lettuces of several of our villagers have this phenomenon.†Subsequently, Liu Chenghu came to Xinchang Town Agricultural Technology Station for assistance. Assistant agronomist Guo Qunying said after seeing the lettuce from the villagers, causing a burst of lettuce. The reason is mainly related to the variety, and there is also a gap between cold and hot climate, and it is related to fertilizer and water. Prevention measures can take the following types:
1, species selection. According to the local planting conditions, lettuce varieties with green leaves resistant to cracking can be selected. Especially for the seasons where the irrigation conditions are poor and the temperature varies greatly, green leaves lettuce with low water content and strong anti-cracking stalks should be selected.
2, fertilizer and water management. When the lettuce leaves are flush with the rosette leaves, their stems begin to swell and they should be poured with a small amount of water and topdressing quick-dissolving fertilizer. After starting watering, the expansion of the stems speeds up, the ground is slightly dry, watering, watering should be uniform, the amount of water should be moderate, and prevent flooding.
3, control the temperature. After winter, it is necessary to control the temperature in the greenhouse. In case of sunny days, it is necessary to timely open the ventilation and cooling of the greenhouse film. In case of low temperature, the greenhouse film should be closed and the insulation should be kept to keep the temperature within the suitable range.
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