Tips on how to prevent watermelons from emptying the seedlings .

There are four main reasons for the "empty seedlings" of watermelons:

1) Watermelon vine extension period encounters high temperature and humidity. The watermelon vine extension period coincides with the season of high temperature and high humidity, and the vegetative growth of the plants is vigorous, and the reproductive growth is inhibited or the artificial management cannot keep up, resulting in field canopy. Plants that produce "empty seedlings" such as insufficient light, high soil moisture, and reduced ventilation and ventilation performance must be pinched in time to pinch the tips and hit water branches (side vines) to enhance ventilation and light transmission performance, or pinch off the top of the main vine on the 4th and 6th leaves of the main vine to promote the side vines to sit melons.

2) Improper management of water and fertilizer. Partial application of nitrogen fertilizer occurs wildly. The plants running the vine should be pinched at intervals of 1 2 nodes after the appearance of female flowers, and the nutrients should be intercepted to the ovary**, which can improve the quality of the ovary and achieve the required sitting melon.

At the same time, phosphorus and potassium fertilizers should be increased during the melon setting period to coordinate the nutrient balance, control vegetative growth, and promote reproductive growth. For high temperature and drought caused by plant thinness, should be early top dressing, the method is 20 cm from the root side of the plant 15 cm deep ditch, 10 kg of urea, 10 kg of potassium sulfate per mu, dry day top water fertilizer, rainy day top grain fertilizer, watering depends on the soil moisture status. Do not water with water and fertilizer after flowering and before setting the melon, so as not to drop the young melon.

3) High temperature and drought during flowering. Drought causes male and female flower stunting, due to extreme drought during the flowering period, high humidity causes male flower stunting, generally use the concentration of potassium dihydrogen phosphate solution or phosphate fertilizer solution to water the roots, or use large water to change the air and soil temperature to improve the field microclimate, promote pollen development and increase the fertilization rate. Due to high temperature and drought caused by the plant there are no female flowers, if there is still no female flowers when the melon vine grows to 3 5 meters, the three vines should be cut off immediately, each vine is left to be long, and then the concentration is potassium dihydrogen phosphate solution or phosphate fertilizer solution, to water thoroughly, to promote the new vine, leave the melon on the new vine.

4) The flowering period is rainy and low. During the flowering period, rain precautions can be taken in advance according to the weather forecast. In the afternoon of the day before to the field to open the next day to put on a rainproof paper hat, the next morning before 5 o'clock to the field to open the male flowers to pick down and put up with a container, put in the temperature of the room for standby, to 6 9 o'clock when the female flowers open, with the male flower pollen that has been opened gently wiped on the stigma of the female flower, to wipe evenly, immediately after pollination to the female flower to wear a rainproof paper cap, so as not to cause the female flower and pollen to break the pollen after the rain, sperm nucleus loss, thus affecting the melon.

Summary. 1.Breed selection.

It is advisable to choose varieties that are highly resistant to viruses, resistant to high temperatures, and have good fertility. 2.Temperature and humidity management.

The high temperature in summer is prone to the phenomenon of watermelon inverting, so cooling and humidity reduction is the main way to prevent it. In hot weather, it is recommended to cover the fruit with leaves to avoid high temperature exposure. If it is a greenhouse watermelon, you can take the way of covering mulch, and pay attention to strengthening ventilation.

In addition, friends with conditions can also use professional equipment such as fans, sprinkler equipment, and water curtain devices to cool down and reduce humidity. 3.Pruning.

Proper pruning, if necessary, leave side branches to ensure that the plant has a certain functional leaf area, maintain a high photosynthetic efficiency, and promote the normal development of fruits. But be careful not to prune in drought conditions. 4.

Day-to-day management. It mainly includes fertilizer and water management and disease management. Generally speaking, watermelon needs to increase water and fertilizer efforts after fruit bearing, and spraying medium and trace element foliar fertilizer can improve the plant's stress resistance and prevent the occurrence of premature aging.

Diseases should focus on viral diseases, anthrax, epidemics, etc.

1.Breed selection. It is recommended to choose varieties that are highly resistant to viruses, resistant to high temperatures and have good fertility.

2.Temperature and humidity management. The high temperature in summer is prone to the phenomenon of watermelon inverting, so cooling and humidity reduction is the main way to prevent it.

In hot weather, it is recommended to cover the fruit with leaves to avoid high temperature exposure. If it is a greenhouse watermelon, you can take the way of covering mulch, and pay attention to strengthening ventilation. In addition, friends with conditions can also split the sail with the help of fans, sprinkler equipment, water curtain devices and other professional equipment to cool down and reduce humidity.

3.Pruning. Proper pruning, if necessary, leave side branches to ensure that the plant has a certain functional leaf area, maintain a high photosynthetic efficiency, and promote the normal development of fruits.

But be careful not to prune in drought conditions. 4.Day-to-day management.

It mainly includes fertilizer and water management and disease management. Generally speaking, watermelon needs to increase water and fertilizer efforts after fruit hanging, and spray medium and trace element foliar fertilizer to improve the stress resistance of plants and prevent the production of premature aging. Diseases should focus on viral diseases, anthrax, epidemics, etc.

When the occurrence of cataplexy at the seedling stage of watermelon is severe, it should be prevented and treated with medication in time. It can be used for the prevention and control of enoylchangda manganese zinc, sodium disulfonate, downy mildew hydrochloride, oxazole, azoxystrobin, azole ether dysenlian, enoyl pyrazole ester, etc., which can also prevent watermelon blight and stem base rot. Spray the base of the stem and around the ground, alternately spray, once every 6 7 days, 2 3 times in a row.

After application, if the bed soil is too humid and it is inconvenient to ventilate and reduce humidity, you can sprinkle the bed surface with fine Honghong Xunqing soil to absorb moisture to avoid excessive humidity and aggravation of the disease.

The growth of watermelon seedlings refers to the flowering and fruiting of female flowers due to improper management or other reasons that cause the seedlings to be too long, too thick and too tender during the growth period of watermelon seedlings. Here are some ways to prevent watermelon seedlings from growing:

1.Reasonable fertilization: Timely fertilization during the growth of watermelon, with an appropriate amount of nutrients, to ensure the strong growth of melon seedlings.

2.Remove side branches in time: cut off the weak side branches on the main branches, reduce excessive stems and leaves, so as to facilitate the centralized supply of nutrients, promote the flow of qi and light transmission, and avoid excessive humidity and high temperature.

3.Moderate watering: Keep it moderately moist and avoid drought or overwatering.

4.It is recommended to use supports: you can pay attention to building row or net supports, and tie the elongated seedlings to the supports to control the distribution and stability of the stems.

In summary, the above methods can effectively prevent the growth of watermelon seedlings, but it is necessary to pay attention to the appropriate management measures according to the specific environment and regional conditions.

The principle of preventing watermelon seedlings from growing:

The first is reasonable fertilization, using rotting farmhouse fertilizer as the bottom fertilizer, two seed disinfection, seedbed disinfection, three and time seedlings to leave the appropriate density, four scientific prevention and control of pests and diseases, and five timely spraying of foliar fertilizer to supplement trace elements.

Watermelon fertilization technology points.

1.Fertilize the seedbed.

The nutrient soil for watermelon seedling raising should be rich in organic matter, loose, and have strong water retention and fertility retention.

2.Fertilization of the land.

Heavy application of basal fertilizer is the basis for ensuring the robust growth and high yield of watermelon stems. After the harvest of the previous crop, combined with deep ploughing and land preparation, 4,000 kg of decomposed organic fertilizer was applied per mu, and a 30 cm deep ditch was opened according to the specified row spacing. The bottom of the ditch is covered with 10 cm thick organic fertilizer, 30 kg of compound fertilizer or 10 kg of urea, 15 kg of diammonium phosphate and 15 kg of potassium sulfate.

Then apply a layer of 10 cm thick organic fertilizer, and apply 20 kg of compound fertilizer or 10 kg of diammonium phosphate, potassium sulfate and urea on the top layer. Mix chemical fertilizers, organic fertilizers and soil in the ditch evenly and level them.

3.Top dressing after planting.

Watermelons enter the sowing stage, and the demand for fertilizer and water gradually increases. At this time, the top dressing should be aimed at promoting vine growth and expanding the leaf area, but to prevent overgrowth. Top dressing is mainly decomposed organic fertilizer, with an appropriate amount of chemical fertilizer; When the normal young fruit grows to the size of an egg, the fruit begins to expand rapidly, and the fertilizer requirement of the plant gradually reaches its peak throughout the growing season.

At this time, it is necessary to reapply the melon fertilizer to promote the expansion of the melon body and prevent premature aging. Top dressing is mainly phosphorus and potassium fertilizer, with less or no nitrogen fertilizer to avoid excessive nitrogen fertilizer and the decline of watermelon quality.

<> management of watermelon seedlings, Zhaopei needs to provide appropriate water for the plants, provide a relatively moist growth environment for the plants, and also need to provide appropriate nutrients for the plants, improve the growth rate of the plants, and also need to prune the plants properly, improve the ventilation of the plant growth environment, so that the plants can grow healthily.

1. Provide moisture.

Watermelon is suitable for growing in a relatively humid environment, so it is necessary to provide an appropriate amount of water for the plant when maintaining the watermelon seedlings, keep the soil in a moist state, and at the same time pay attention to the watering method when providing water for the plant, generally need to water the water directly in the soil, soak all the soil.

2. Supplement nutrients.

Watermelon will consume a lot of nutrients in the process of growth, so it is also necessary to provide reasonable nutrients for the plant when maintaining the watermelon seedling, so that the plant grows more vigorously, and when providing nutrients for the plant, you need to pay attention to the amount of fertilizer, generally you can dilute the fertilizer in clean water and provide it to the plant, so that the plant can grow better. Loss of spine.

3. Suitable for light.

Watermelon is suitable for growing in a warmer environment, so it is necessary to provide appropriate light for the plant when maintaining watermelon seedlings, so that the plant can carry out photosynthesis normally, and pay attention to the light intensity when providing light for the plant.

4. Disease prevention and control.

The environment in which watermelon grows is more humid, and there are more vines in watermelon, and the ventilation is poor, so the plant is prone to disease in the process of growth, and the plant needs to be properly pruned when maintaining the watermelon seedling in the later stage, and the branches and leaves that grow too densely are cut off, so as to improve the ventilation between the plants and avoid the plant from suffering from diseases.

The whole growth period of watermelon is about 80 85 days, and its growth process can be divided into germination stage, seedling stage, vine extension stage and fruiting stage.

At the germination stage, the seeds germinate to the cotyledons are flattened, and 2 3 young leaves are formed at the end of the seedlings. Under the condition of 25 30, it takes about 10 days.

The seedling stage is from the first true leaf to 5 6 leaves"Cluster period"。At 20 25 temperatures, it usually takes about 20 days, while at 15 20 temperatures it takes about 30 days.

Solution: 1. You can use "ethephon" plus "love more harvest" and "green leaf Shenfeng" spray.

2. Soil preparation and fertilization.

3. Artificial pollination. Due to the flowering habits of watermelons, pollination should be carried out at 8-9 a.m. On cloudy days, male flowers are late in pollination, which can be appropriately delayed.

In order to prevent the male flowers from pollinating late on rainy days, the male flowers that can open the next day can be retrieved in the afternoon of the first day and placed in dry and warm conditions indoors, so that the flowers can be pollinated on time in the morning of the next day, and then the female flowers can be pollinated with this flower. Pollination should begin with the second female flower. so as to keep the melons.

4. Choose melons and hanging melons. In order to improve the weight of a single melon and make the melon shape upright, the second female flower should be selected to sit on the melon, the melon is small and the melon shape is not correct too early, and it is not conducive to the morning market too late, generally 3 5 days after pollination, the melon fetus is obviously grown, and the melon should be preferentially left on the main vine; Stay on the main vine, and leave melons on the side vines. In the case of bracket cultivation, when the melon grows to about a kilogram as large as the mouth of the bowl, the gourd should be hung in time to prevent the young melon from falling after enlargement.

In the case of ground climbing cultivation, melons should be selected, cushioned and turned as arched shed cultivation.

Because there is one less process, the reason is the temperature, baleen whales in 25 to 30 degrees conditions, ten days, about 20 degrees to 30 degrees, it takes 20 days, and at 15 to 20 degrees temperature, it takes about 30 days.

The reason for the occurrence of watermelon "empty seedling" is mainly caused by unfavorable climatic factors, cultivation technology reasons and imperfect management measures. Let's talk about how to do a good job of prevention:

1. The prevention and control method of watermelon "empty seedling" caused by low temperature during flowering period Lu Song should be used for plants that cannot be fertilized normally due to pollen development due to low temperature during flowering.

Artificial pollination. Artificially promote the sitting of melons to prevent "empty seedlings".

2. Prevention and control methods of watermelon "empty seedlings" caused by high temperature and drought.

Watermelon encounters high temperature and drought weather during the growth process, resulting in stunted development of male flowers, unable to complete normal fertilization and resulting in flower dropping.

Melon. The production of "empty seedlings" is generally used to water the roots with phosphate fertilizer or with concentration.

Potassium monobasic phosphate.

The method of watering the roots, or using large water irrigation to change the air and.

Soil moisture. to improve the field.

Microclimate. Promote pollen development to improve fertilization, prevent falling flowers and melons from "empty seedlings"; Due to high temperature and drought caused by the plant no female flowers, when the melon vine grows to 3-5 meters there is still no female flower, the three vines should be cut off, each vine to be rice long and then watered potassium dihydrogen phosphate water or phosphate fertilizer water, to water thoroughly, to promote the re-emergence of new vines, on the new vine to leave melons, prevention and control of "empty seedlings".

Prevention and control method of watermelon "empty seedling" caused by rainy flowering period.

The flowering period encounters rain and should be based.

Weather forecast. Take rainproof measures in advance, put on a rainproof paper hat on the female flowers that will open on the second day in the afternoon of the previous day, pick the male flowers that will open in the field before 5 o'clock in the morning on the second day, and put them in the room at a suitable temperature for standby, and when the female flowers open at 6-9 o'clock, use the spare male flower pollen for artificial pollination. After pollination, the female flowers are put on paper caps to prevent raindrops from falling on them and affecting pollination, resulting in falling flowers and melons "empty early infiltration of Zheng seedlings".

Intense sun burns and.

Wind. The prevention and control method of causing watermelon "empty seedlings".

In order to prevent burning of young melons, weeds can be used to cover young melons, which has a certain effect on preventing young melon burns, deformities, falling flowers, and turning melons into "empty seedlings"; In order to prevent wind damage, wet soil can be used to cultivate the front and rear two stem nodes of young melons to prevent the "empty seedlings" of falling melons caused by the shaking of stems and leaves due to the wind.