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Because raw lettuce is mainly eaten raw, top dressing is not applied to human waste or chicken manure, mainly based on chemical fertilizers, generally top dressing 3 to 4 times, once after 15 days of slowing seedlings, the group of trees is once, and the period of burden is once, each time Apply urea 5 to 8 kg, flush with the water, but can not be used too much to prevent lettuce heartburn. During the growing season, potassium dihydrogen phosphate may be sprayed on the leaves to increase disease resistance and food quality.