Is the hollowness of watermelon caused by the weather or by itself?

The hollowness of watermelon has something to do with the weather itself.

Cause analysis:

The temperature is lower when the fruit is ripe.

The suitable temperature for watermelon flowering and fruit setting is 25 ~ 30℃, and the daily average minimum temperature is 20 ~ 2 1℃.

Watermelon fruit undergoes cell division after fruit setting (before molting) to increase the number of cells in the fruit, and then the watermelon fruit expands rapidly through cell expansion.

If the temperature is low when the fruit is set, the speed of cell division will slow down, so that the number of cells in the fruit will not reach enough. In the later stage, with the increase of temperature, the peel will expand rapidly, and the fruit will become hollow because the number of cells is not enough to fill the space in the fruit.

Rain is scarce during fruit development.

The development of fruit must be based on adequate nutrition. If there are more rainy days and less light during fruit development, photosynthesis will be affected, resulting in a serious shortage of nutrients, which will affect cell division and cell volume increase in fruit. However, the development of pericarp requires relatively little nutrition, and it will still develop rapidly and form holes when nutrition is insufficient.

In addition, too much nitrogen fertilizer, too much rain or water, and untimely pruning and vine pressing will all cause the plants to grow white and the stems and leaves will be covered, which will affect photosynthesis. Moreover, the growth of stems and leaves will compete with the fruit for nutrients, which will also make the fruit appear hollow due to insufficient nutrient supply.

Low fruit-setting node position

The melon with the first female flower has low fruit setting temperature and poor pollination and fertilization.

In addition, at that time, the leaf area was small and the nutrient supply was insufficient, which could not fully increase the ventricular volume. If exposed to high temperature in the future, the peel will expand rapidly and become hollow.

Water shortage during fruit development

The development of watermelon fruit needs not only enough nutrients, but also enough water (too much water is not good). If the fruit is seriously short of water during the expansion period, the cells in the fruit can not fully expand and form holes.

Overripe harvest

Before the watermelon ripens, nutrients and water are continuously transported to the fruit. After ripening, if it is not harvested in time, nutrients and water will flow back from the fruit, and the fruit will be hollow due to the loss of water and nutrients.

This phenomenon is more obvious in varieties with fast fruit development.

Prevention and control methods:

In order to prevent watermelon from being hollow, it is necessary to comprehensively use cultivation measures to create an ecological environment conducive to watermelon growth.

For watermelons that have set fruit but have deformed melons, it is necessary to remove the deformed melons in time and apply ternary compound fertilizer to promote the branching, healthy growth and re-setting of watermelons.

For watermelons that are bearing fruit but sowing late, the young melons in the first section should be picked in time, and the fruits in the third or fourth section should be selected to avoid hollowness.

Gua Tian, which is seriously short of water during the fruit expansion period after watermelon pollination, should be properly irrigated in time to prevent dehydration from forming cavities and avoid spraying hormones.