The soil fertility is poor. If topdressing is not carried out in time, plants will have insufficient nutrients, weak growth, poor root growth, few leaves, limited photosynthesis and less synthetic nutrients, which can not meet the needs of fruit growth, thus leading to hollow symptoms of cucumber.

Prevention and control methods: If cucumber wants to grow well, we must pay attention to fertilization, apply sufficient base fertilizer before planting, and apply additional fertilizer reasonably during the growth period to ensure good root growth and strengthen fertilizer and water absorption, which is conducive to the improvement of yield and quality.

2. Some elements are missing

In addition to malnutrition, in a well-nourished environment, if boron or potassium is lacking, it will also cause cavities. The main reason is that many farmers blindly apply nitrogen fertilizer or do not apply organic fertilizer and farmyard manure in order to increase production. Partial application of nitrogen fertilizer will affect the absorption of other elements by roots, and no application of organic fertilizer will lead to the lack of trace elements in the soil, which will lead to cavities.

Prevention and control methods: fertilization must be scientific and reasonable, and the base fertilizer is mainly farmyard manure or organic fertilizer. The application amount of nitrogen fertilizer must be controlled, especially in the flower and fruit period, when the demand for nitrogen fertilizer is small, the application amount of phosphorus, potassium fertilizer or trace fertilizer should be increased.

3, high temperature reasons

In hot weather, especially when the temperature is too high at night, cucumber is easy to grow in white, which leads to uneven growth nutrients and hollow phenomenon, which is a common phenomenon in many greenhouse cultivation.

Prevention and control methods: When the temperature is high, attention should be paid to improving the way of strengthening ventilation or spraying water mist to cool down, and controlling the temperature at the limit suitable for cucumber growth, neither too high nor too low.

4, the reason of moisture

When the futures fluctuate greatly, the root system will be damaged because the ground temperature is too low or too high, resulting in water shortage and nutrient imbalance in cucumber planting. One reason is that long-term exposure causes plants to lack water and cucumbers are hollow.

Prevention and control methods: pay attention to the change of temperature, water reasonably, keep the soil moisture to a certain extent, but pay attention to drainage in rainy season.