The reason why lettuce doesn't bear balls.

Ball lettuce is not like the kind of scattered lettuce, but the heart-wrapped lettuce that will bear balls as it grows. It is also very popular in the market, but it is sometimes found that there is no guarantee in the process of planting. This will directly affect the quality of sales. So today we will discuss the reason why lettuce does not bear balls, and how to solve this problem.

1. Reason

It may be because of the variety, the cultivated varieties can be selected according to the local environmental conditions, such as the local planting heading period is in the high temperature stage, and the varieties that are tolerant to high temperature can be selected. Single fertilization results in non-heading, partial application of nitrogen fertilizer, lack of phosphorus and potassium fertilizer, or lack of trace element fertilizer. The temperature is too high, the growth and setting temperature can not exceed 25 degrees, which is easy to cause damage. A large amount of water is needed during the heading period, and underwatering is also a reason. The impact of diseases and insect pests is generally easy to see.

2. Fertilization

The use of mature organic fertilizer per mu of lettuce is about 3000 jin and compound fertilizer 100 jin. These are base fertilizer or base fertilizer. Topdressing is about two to three weeks after planting and then topdressing 40 jin of compound fertilizer. One month after planting, there is still 30 jin or 20 jin of compound fertilizer. There is no need for fertilizer after that.

3. Temperature and humidity

Lettuce likes cool climate, so it is better to plant it in spring, or in autumn, at the end of spring, do not let the heading period be carried out in summer, and cannot be planted in midsummer, otherwise it is easy to fail to bear balls and rot easily in case of rain. Usually maintain water balance, keep moist, maintain 65% humidity. More watering can be done during the heading period. After pilling, you have to control the water. Too much moisture is easy to rot.

4. Disease and pest control

Planting in protected areas is more prone to disease, but the disease in open land is not clear, which often affects heading disease, soft rot, virus disease and top fever disease. The pests affecting heading are aphids and whitefly. Seeds, soil disinfection, sun drying. Spray medicine in time to control the spread of the disease. Use related medicament to prevent and cure. It can also be covered with silver gray film to avoid.

Ball lettuce is a variety of lettuce with good economic benefits. The phenomenon of non-heading in planting is affected by a variety of reasons. We will think of countermeasures after careful judgment.