The watermelon puffing period is one of the key stages of watermelon growth. At this time, if the management work is not in place, it will lead to a later stage of production reduction. At this time, it is not far from the mature period. The melon farmers really need to grasp this stage. Otherwise, the previous work will be done in vain. So how to manage the watermelon fruit expansion period?
First, melon protection method
The watermelon is the first fruit, and the epidermis of the ovary and young melon is very delicate, which is susceptible to wind, insect bites and mechanical damage. At this time, young melons can be covered with paper bags, plastic bags, etc. After the young melons are stabilized, the ground under the melons will be fined into a ramp-shaped platform, and then the young melons will be placed along the slope. Crush grass, wheat straw or fine soil under the young melon and near the rhizosphere of the plant to make the fruit grow round, and also have a certain effect of drought resistance and moisture protection.
2. Water Management
If the watermelon is too short of water before entering the fruit-blowing period, the leaves will stagnate, the melon will become soft, and even fall. If the watermelon in the expansion stage is short of water, the growth will slow down, the maturity period will be postponed accordingly, and the size will not be as large as it should be. Therefore, when the fruit begins to swell and it is predicted that there will be no drizzle in the near future, it should be irrigated alternately, and the fertilizer should be applied along the water. This irrigation should not be delayed. The watermelon should stop irrigation after the end of melon formation. In case of heavy rain, we must pay close attention to drainage to prevent the watermelon from reducing sugar content, cracking fruit, and suffering from waterlogging.
3. Scientific fertilization
The swelling fruit fertilizer can be applied twice, the size of the eggs and the size of the mouth of the young melon, pay attention to phosphorus and potassium fertilizer, combined with nitrogen fertilizer. The first time is to apply the watermelon after sitting down, using a compound fertilizer of medium nitrogen, medium potassium, and low phosphorus of 40 kg or 20 kg of water-soluble fertilizer, plus some organic fertilizer to promote rooting; at this time, the watermelon is still in the young fruit stage. Do not need too high potassium, potassium is too high but will limit the expansion of watermelon later fruit, so it is recommended to use medium nitrogen, medium potassium fertilizer. High potassium fertilizers are needed in the second and third top dressing. At this time, the rapid expansion of watermelon requires a lot of potassium fertilizer, and it is best to absorb potassium nitrate faster. So at this time, high-potassium, medium-nitrogen, and low-phosphorus water-soluble fertilizers of 20-25 kg are needed. It is best to add some rooting organic fertilizers to prevent premature aging of watermelon.
Four, matters needing attention
When the grafted watermelon growth temperature exceeds 35 degrees, the growth will slow down, when it exceeds 40 degrees, it will stop growing; when the grafted watermelon growth temperature is below 12 degrees, it will inhibit the growth due to low temperature, and when it is below 5 degrees Celsius, freezing damage will occur . Therefore, it is better to increase the ventilation temperature during the day of the watermelon fruit expansion period to control between 30-35 degrees, and it is best to keep it between 13-16 degrees at night, so that it not only grows well, but also effectively prevents pests and diseases.
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