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Breeding reasons If semi-balloon or loose-leaf lettuce varieties are used in the production, such as American fast-growing, glass lettuce, lettuce king, etc., the glutinousness will be poor, and it may not even be laid.
Fertilizer is not enough for many vegetable farmers to grasp the amount of fertilizer required lettuce, phosphorus, potassium, calcium deficiency, it is easy to cause knot ball difficult.
Improper temperature management The optimum temperature for lettuce growth is 15°C～20°C. The suitable temperature for the ball is 10°C～16°C. The temperature exceeding 25°C is not only unfavorable for the ball, but also causes the necrosis or rot of the heart due to the high temperature.
Inappropriate humidity management When planting lettuce with lettuce in protected areas, some vegetable farmers worry that after watering, they will affect the temperature and yield, and most watering will be insufficient. The largest amount of water is required for the growth of lettuce, and watering must be controlled after the formation of leaves.
Diseases and pests affecting the lettuce growing in the protective field than the cultivation of lettuce pests planted in the open place, which may affect the normal lettuce lettuce.
The cabbage lettuce sown from late August to mid-October has gradually entered the harvest period, but some vegetable farmers found that some lettuce hearts are still fluffy and do not see the ball. After investigation and analysis, the main reasons for knotted lettuce are as follows: