Watermelon is a very common type of fruit in our lives. It can be eaten in almost every season, but it is a seasonal fruit in summer. Watermelon in summer will be more delicious. Farmers who grow watermelons sometimes find that watermelons are dry and cracked. What are the reasons for watermelon cracking? How to prevent watermelon cracking? The editor will take everyone to take a look.

1. Improper use of the watermelon Zugualing leads to dry and cracked watermelon

In order to promote watermelon constellation, many growers use Zugualing to blow out the fetus on the day of the flowering of the watermelon female flower or the day before the flower. Some melon farmers are worried that they will not be able to sit still, so they increase the concentration of Zuogualing, or repeatedly spray the fetus, resulting in a large number of deformed melons, cracked melons, and hollow melons.

Prevention:

Immediately remove all deformed fruits and split melons, regardless of size, strengthen water management and pruning, promote the opening and growth of the second batch of melons, cultivate new female flowers, and pollinate timely to minimize losses.

Try to use artificial assisted pollination or stocking bees to promote fruit setting. If you encounter continuous rain or low temperature, you can use Zangguo Ling, but you must use the appropriate concentration at the appropriate time.

When spraying Zuogualing, choose the appropriate concentration according to the temperature and climate to prevent the concentration from being too high or low. At 22-28℃, 10ml of Zuogualing should be mixed with 3-5 kg ​​of water. When the temperature is low, the amount of water should be appropriately reduced. Avoid the high temperature period as much as possible to treat the melon fetus, to prevent the evaporation of the liquid water from causing the concentration to be too high and causing cracking of the melon.

When spraying the melon fetus, it must be sprayed on both sides to prevent the watermelon from being deformed due to uneven spraying of the medicine; too much liquid is attached to the melon fetus, use hand flick to hit the melon vine to remove the excess liquid to reduce cracking Melon opportunity. At the same time, avoid repeated processing of melon fetus and cause cracking.

Two, climatic factors cause the watermelon to dry and crack

In the young fruit stage of watermelon, the cell division is insufficient in the early low temperature, and the growth is slow, and the temperature rises during the expansion stage, and the cell division is accelerated, while the cell division of the skin is slow, causing the growth rate of watermelon flesh to be greater than that of the skin, resulting in cracking.

The sharp change in temperature during the fruiting stage of watermelon leads to cracking of the watermelon. For example: in rainy days, low light and low temperature in the greenhouse will easily cause the cork cork and reduce the toughness of the cork. After the weather is clear, the temperature rises rapidly, and the growth rate of the flesh part of the watermelon is faster than the growth rate of the epidermal tissue, which causes the watermelon to crack.

Prevention:

The temperature in the greenhouse is well regulated, the temperature during the flowering and fruiting period of watermelon is 28-30 degrees, and the low temperature for fruit development is 15 degrees. During the watermelon swelling period, when the temperature rises, it is necessary to timely release the air to cool down, adjust the size of the air outlet, keep it at 28-32°C during the day and keep it above 15°C at night.

3. Irrational watering of watermelons in greenhouses causes watermelons to dry out

The water supply of the fruit during the fruiting stage of the watermelon changes suddenly. The soil in the greenhouse is too dry in the early stage, and the watermelon grows slowly and the cortex is aging. In the later stage, water is suddenly poured. After the watermelon absorbs water, the volume of the flesh increases too fast, and the growth rate of the skin cannot keep up with the melon. The flesh grows and bursts. After excessive water control, watering too quickly, even if the amount of water is not very large, it will cause cracking of the melon.

Prevention:

Water enough planting water, before laying the mulch, water slow seedling water; in the early stage of pollination, watermelon should not be properly controlled after 7 days until the watermelon grows to the size of an egg; after the young melons are shed hair, water the swelling water in time, and the amount of water should not be too large; Watering should be uniform during the period to prevent short-term watering surges or flooding. Watering should be done every 7-10 days. Noon watering is forbidden during high temperature period, and water should be stopped 7 days before harvesting.

4. Unbalanced nutrition of the watermelon in the greenhouse causes the watermelon to dry and crack

Partial application of nitrogen fertilizer during the expansion period of watermelon. Excessive use of nitrogen fertilizer results in reduced skin toughness, slow growth, and fast expansion of the flesh. The two speeds are not uniform, resulting in cracking.

During the swelling stage of watermelon, due to lack of calcium, magnesium, boron, silicon and other medium and trace elements, the toughness and hardness of the watermelon skin are reduced, resulting in cracking of the watermelon.

The soil in the greenhouse is compacted, the air permeability is not good, the root vitality is reduced, the buffering force for moisture and temperature is reduced, and the phenomenon of melon cracking occurs.

Prevention:

Use fully decomposed and fermented farmyard manure or microbial organic fertilizer as base fertilizer to improve soil, and appropriately add calcium fertilizer or calcium magnesium phosphate fertilizer. During the expansion period of watermelon, control the amount of nitrogen fertilizer and pay attention to phosphorus and potassium fertilizer. At the same time, foliar sprays such as calcium sugar alcohol, calcium amino acid and other calcium fertilizers and potassium dihydrogen phosphate to prevent watermelon cracking.

5. Watermelon variety factors cause watermelon to dry and crack

In watermelon production, thin-skinned watermelons and round watermelons are easy to crack; thick-skinned watermelons and oval watermelons are not easy to crack.

Control measures: According to local market conditions, it is recommended to choose watermelon varieties with relatively strong skin toughness, such as: Hongyu, Sweet King, Black Beauty, etc.

For easy-to-rip watermelon varieties, one more vine can be appropriately left to reduce the transportation of nutrients into the fruit and prevent the single melon from expanding too quickly and causing the melon to split.

Sixth, improper operation of the greenhouse windproof causes the watermelon to dry and crack

When the watermelon greenhouse was released, the wind suddenly became too large, causing the watermelon's skin to lose water and the skin to dry and shrank.

Prevention:

Open the shed and let the wind release. The principle of opening the shed early and closing the shed early, up and down first, and small first and then big. Windproof tents should be set up for hanging vine watermelons to prevent direct wind from blowing.

Seven, improper retention of watermelon leads to dry and cracked watermelon

If the watermelon has too long nodes, the leaf area is too large, and the nutrient supply is too high, cracking will occur when the watermelon expands too fast. When the watermelon is fixed, the umbilicus of the umbilicus is small and the umbilicus is small, and it is prone to cracking.

Prevention:

The location of the melon for watermelon is generally between 12 and 14 leaves. When the melon is to be retained, choose the new melon with a small umbilicus and a positive fruit shape.

8. Excessive use of swelling agent during swelling period or too early to swell the watermelon

Prevention:

Scientific application of swelling agent, avoid high temperature medication, or refuse to use swelling agent products, you can choose to use high-potassium water-soluble fertilizer.