During the expansion of lettuce, sufficient nitrogen and potassium fertilizers are needed to rapidly inflate. Specific methods are as follows:
In the early, middle and late stages of lettuce elongation, nitrogen and potassium fertilizers are applied at a time, and 15-20 kg of urea, 8-10 kg of potassium sulfate, or 20-25 kg of potassium nitrate are applied per mu, which is against fresh water or biogas slurry. After 150 to 200 times of decomposed human or animal manure water is poured, it is evenly applied to the soil around the root of the lettuce plant. It is better to completely infiltrate into the soil without overflow. In addition, during the elongation and expansion of lettuce, the leaves should be sprayed with 0.3% urea, 600 times amino acid potassium mixture or 0.5% potassium nitrate solution once every 7 to 10 days, and sprayed continuously for 2 to 3 times. Spray all the leaves evenly to start dropping drops of water, supplementing nitrogen and potassium fertilizers from the leaves.
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