The watermelon turned yellow and fell off within a few days of flowering

Try the soil conditioner, I was like this before, using the one produced by Hebei Zhongrui,

Yellow leaves caused by improper use of fertilizer and root burning due to the use of unrotted human and animal manure, or long-term use of a large amount of chemical fertilizer, resulting in fertilizer and root damage。Some use too much inferior foliar fertilizer, because many foliar fertilizers on the market contain hormones, resulting in watermelon hormone and micro-fertilizer poisoning, making the leaves ossified, green, brittle, deformed, yellow.

Workaround:

1. It is strictly forbidden to use undecomposed human and animal manure, and chicken and cow manure must be fully fermented and rotted in advance before it can be used. For the perennial use of undecomposed human and animal manure and chemical fertilizer to cause soil poisoning plots, soil conditioners should be used for soil improvement and adjustment, can be applied to a bag of Dibao per mu, with compound fertilizer and so on, 2-3 times a year, 1-2 bags each time, about 2 years can be a good restoration of the normal mechanism of the soil.

2. The use of chemical fertilizers, it is best to take formula fertilization, appropriately increase phosphorus and potassium fertilizers, and when applying base fertilizers, nitrogen fertilizers should not be used too much to prevent nitrogen from burning roots.

3. If the fertilizer is found to burn the roots, it should be sprayed in time to spray Dehua Xinlu Solution, 15 kg of water per mu, and the rotten roots and yellow leaves of watermelons planted in the greenhouse due to the use of raw manure should also be used to break the membrane and ventilate the method to reduce air damage.

The watermelon falls when it bears fruit, and it is likely that there is no pollination and no sitting fruit. It is best to help pollinate manually at the time of flowering, so that the fruiting rate will be greatly improved. It can also be caused by improper management, such as improper water allocation or lack of water nutrients, which will stunt growth, and even if it can bear fruit, the fruit will fall.

During the flowering and fruiting period, we must pay attention to fertilizer and water management to ensure that fertilizer and water are sufficient.

Is there too many vines, one vine is kept 1-2 or is it just a seed problem.

It may be caused by improper fertilization and burning of the roots.

How watermelons are cultivated after they bear fruit.

Zhi Zheng From the opening of the female flower to before and after fruit set, the anterior chamber of the seed and the epidermal tissue of the young melon are very delicate, and they are susceptible to wind, insect bite and mechanical damage. When the fruit grows to kilograms, the soil under the melon is broken and leveled, and the grass or fine sand is covered with grass, that is, the cushion melon. Turning the melon is to constantly change the landing part of the fruit, so that the melon surface receives light evenly, the skin color is consistent, and the ripeness of the melon pulp is uniform.

Turning melon is generally carried out in the middle and late stages of puffing melon, turning once every 5-6 days, turning 2-3 times, turning melon should be carried out in the afternoon on a sunny day when the moisture of the melon handle is reduced, it is not easy to break, operate with both hands, the angle of each flip is not easy to be too large, and the ground can be exposed, so as not to sprain and twist the melon handle, and each time the melon should be turned in the same direction. A few days before the watermelon is ripe and harvested, the melon can be erected to help the fruit shape be round and the melon skin is well colored, otherwise, the landing place can not see the sun, and it is yellowish-white, which not only affects the appearance of the fruit, but also the thickness of the peel is uneven, the fruit taste is light, and the quality is poor.

The drying and covering of melons are based on the principle of "drying when hours are done and covered when ripe". In the unripe green peel, there is a large amount of chlorophyll, and the photosynthetic products produced are directly lost to the fruit, promoting the accumulation of sugars, so it is necessary to dry it at an hour. When the fruit is about to ripen, the chlorophyll in the peel gradually decomposes, photosynthesis declines, and the inside of the fruit is mainly the transformation of organic matter, rather than the production and accumulation.

If it is directly irradiated by strong light, it is easy to cause solar fever, so when the fruit is about to ripen, it should be covered with leaves.

Fertilize the watermelon during the fruit expansion period.

The swelling period of watermelon is the period with the largest amount of fertilizer, at this time it is necessary to grasp the rhythm of fertilization, when the fruit grows to the size of an egg, you can start fertilizing, in the early stage of fertilization with high potassium water-soluble fertilizer of fertile leaves, and gradually increase the amount of high-potassium water-soluble fertilizer in the later stage to promote the expansion and sweetening of watermelon.

In addition to high-potassium water-soluble fertilizer, watermelon should also add some medium and trace elements, such as fertile leaf calcium fertilizer, in the process of fruit expansion, so as to prevent watermelon from cracking melon, yellow leaves and other physiological diseases.

After the watermelon is successfully pollinated, there will be a small cylinder in the west yard hall of the female flower, that is, there will be a small watermelon, and the watermelon will grow slowly. And if there is no successful pollination, although small guati will grow, they will fall before they grow up.

You can also see the female flowers, and the withering of the female flowers after a few days of pollination also indicates that there is no successful pollination. When pollinating, the male flowers should be picked, and then the pollen of the male flowers should be sprinkled on the female flower pollen, preferably on the ovary of the second female flower, so that the female flowers can better retain melons.

1. Precautions for watermelon pollination.

In order to ensure that after artificial pollination, the melon is being sitting, there are the following precautions:

The pollination time is best carried out within 1 hour after the opening of the watermelon female Laina flower, and it is better to finish before 8:00. Generally, the flowers in the second node of the main vine are selected for pollination. If the second segment is female flower dysplasia or ovary injury, the first segment can be selected.

Choose female flowers with plump, hypertrophied, bright and shiny ovary and thick stalks. After pollination, different pollination times are marked with strips of cloth, etc., to facilitate harvesting at harvest time.

In early spring, the flowering period of watermelons in plastic greenhouses is around late March to early April, the temperature is low, and there is less insect activity, so artificial pollination must be carried out.

Watermelon flowering is affected by the night temperature, the night temperature of 18 is more than 6:00 the next day, the night temperature of 15 is about 8:00 watermelon for artificial pollination is relatively simple, but pay attention to the influence of temperature on flowering.

Pollination is best done within 1 hour of flowering. Generally at 6:00 a.m. to 10:00 a.m

Between 00, the best time is 8:00 and 9:00.

In the process of watermelon maintenance, water-soluble fertilizer can be applied to fertile leaves.

The yellowing of young watermelon fruits can be caused by several reasons:

1.Watermelons are infested with pests and diseases, causing the young fruits to turn yellow.

2.Watermelon lacks nutrients, especially nutrients such as nitrogen, phosphorus and potassium, which can lead to poor growth and yellowing of young fruits.

3.The external environment is not suitable for the growth of watermelon, such as too high or too low temperature, too high or too low humidity, etc.

In response to the above problems, the following measures can be taken:

1.Do a good job in pest control, remove pests and diseases in time, and ensure the healthy growth of watermelon.

2.Sufficient nutrients can be added to the watermelon, either by fertilizing the soil or by spraying the nutrient solution to increase the nutrient content of the watermelon.

3.Control the external environmental conditions, avoid the temperature is too high or too low, the humidity is too high or too small, and try to create a suitable growth environment for watermelon.

In addition, it is also necessary to pay attention to the timely removal of diseased plants and dead branches to promote air circulation and sunlight, as well as basic maintenance work such as watering and draining water to ensure the healthy growth of watermelon.