The lettuce is a herb belonging to the genus Compositae, which is suitable for the slightly acidic soil with rich organic matter and strong water retention and fertilizer retention. It is generally believed that every 1000 kg of lettuce must absorb 3.7 kg of nitrogen, 1.45 kg of phosphorus, and 3.28 kg of potassium. The lettuce grows quickly, and nitrogen fertilizer is good. The amount of fertilizer is small at the initial stage of growth. It enters the balling stage 70 to 80 days after sowing and the nutrient uptake increases dramatically. In the first month of the bulbous stage, the nitrogen uptake can be It accounts for more than 80% of the total growth period. The absorption of phosphorus and potassium is similar to that of nitrogen. In particular, the absorption of potassium not only has a large amount of absorption, but also continues to be harvested. Phosphorus at the seedling stage has a large effect on growth. Phosphorus deficiency during the ball stage will affect the lettuce growth. K deficiency during the ball stage seriously affects leaf weight.
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