What happens when the lettuce is sown?

According to the growers, they have not picked up the cabbage lettuce this year, and it is now in the harvest season. The heart of lettuce is still fluffy and does not see the ball. Not only affects the yield but also affects the quality of lettuce. After field surveys, it was difficult to make lettuce with balls. The main reasons were as follows.

One is the reason for the variety. If you choose to use semi-balloon or loose leaf lettuce, the ball will be poor or even not.

The second is the lack of fertilizer. The lack of fertilizer, especially the lack of phosphorus, potassium and calcium fertilizers, can easily lead to ball problems. In general, planting an acre of lettuce, the base fertilizer should use high quality decomposed organic fertilizer 5000 kg, compound fertilizer 30-50 kg; in addition should pay attention to appropriate top dressing, generally 15-20 days after planting 15-20 kg of compound fertilizer per acre, After 30 days, 15 kg of compound fertilizer or 10 kg of high-nitrogen and high-potassium fertilizer should be applied to each acre.

The third is improper temperature management. Cockle lettuce likes the cold climate, the optimum temperature for growth is 15°C-20°C, and it 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, pests and diseases affect the ball. The cabbage lettuce planted in the protected area has a higher probability of occurrence than the open plant lettuce pests. The main diseases are downy mildew, soft rot, and virus diseases, all of which can affect the normal bacterial growth of lettuce. In addition, locusts, whiteflies, and thrips are prone to spread viral disease and should be treated in time.

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