One is the reason for the variety. Good lettuce varieties in production include: Emperor, General, Caesar, Malik, Oriental Fuxing, Queen, Salinas and others. If the selected half-ball or loose-leaf lettuce varieties such as the American fast-growing, glass lettuce, lettuce king and other varieties are bad, even no ball.
The second is the lack of fertilizer. According to our understanding, many vegetable farmers are not sure about the amount of fertilizer needed for planting lettuce, and some simply do not use base fertilizer. Most of them only use nitrogen fertilizer, and they ignore the use of phosphorus, potassium, and calcium fertilizers. The lack of fertilizer, especially the lack of phosphorus, potassium and calcium fertilizers, can easily lead to ball problems.
The third is improper temperature management. The optimum temperature for growth of lettuce is 15°C-20°C, which is suitable for the environment where the temperature difference between day and night is large and the night temperature is low. The suitable temperature of the ball is 10°C-16°C, and the temperature exceeds 25°C, which is not only unfavorable to the ball but also causes the necrosis or rot of the heart due to the high temperature.
Fourth, improper management of humidity. Planting lettuce with lettuce in protected areas Some growers are worried that watering will affect the temperature and yield of the soil. Therefore, most of the watering is insufficient. The water requirement for the growth of the lettuce is highest, and after the formation of the leaf ball, it is necessary to control the watering so as to prevent cracking and rotting.
Fifth, the impact of pests and diseases on the ball. Cockle lettuce planted in protected areas has a higher incidence of pests and diseases than lettuce planted in the open, and these diseases can affect the normal shoot growth of lettuce. In addition, locusts, whiteflies, and thrips are prone to spread viral disease, and should also be promptly controlled.
Sixth, timing of harvesting is inaccurate. The collection period of loose leaf lettuce is relatively flexible, and there is no strict requirement for general harvesting, which can be determined according to market demand. Harvesting lettuce should be harvested according to different varieties and in different cultivation seasons, and should not be harvested prematurely. Many vegetable farmers in the production have seen better prices in the lettuce market, and they often harvested the cabbage when it is not fully packaged. This will affect the output and overall income.
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