Answer: Chang Zongtang, a consultant from the old Yangling Association for Science and Technology and a researcher at Northwest A&F University, replied that there are many reasons why lettuce is hollow.
Lettuce varieties suitable for planting in autumn are easy to be hollow when planted in summer.
The squatting time of lettuce seedlings is too short, and the root system is small and shallow. When the nutrient absorption in the later stage is insufficient, it is easy to cause hollowness.
Lack of boron, calcium and other trace elements in the plant will affect the formation of biological enzymes in the lettuce and the fragile cell wall, resulting in poor plant resistance and easy hollowing.
During the growth period of lettuce, droughts and floods are uneven, and sudden flooding will cause the internal and external tissues to grow out of sync and form hollows.
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