Cucumbers planted in greenhouses have physiological abnormalities, how to prevent them?

If it is a little more serious, when you carefully observe the cucumber leaves, you can see that there are irregular stripes between the large leaf veins, the color of the stripes is yellow-green or light yellow, and the tissues at the lesions are not necrotic. Cucumber fertilizer damage refers to the phenomenon that the growth of cucumber is hindered due to excessive fertilization or wrong fertilization method of cucumber. At present, there are three common fertilizer damages in the process of cucumber cultivation:

First, the fertilization site and method are improper. Unreasonable fertilization is the key factor causing cucumber fertilizer damage, too much fertilization, improper time, unreasonable methods will cause cucumber fertilizer damage, especially in the closed shed planting, once the fertilizer damage will appear more serious.

Cucumber fertilizer damage refers to a physiological phenomenon in which cucumber grows sluggishly and slowly due to excessive fertilization or incorrect fertilization, and it has two manifestations: mild and severe. WhenIn the case of mild fertilization, it is mainly manifested on the leaves. The color of the leaves changes to dark green, wrinkles appear, and the leaves become thicker; In severe cases, the edges of the leaves will be irregularly patched and even rotten.

Fertilizer damage leads to low yield and quality of cucumbers may be the first time many people have heard, fertilizer damage refers to the slow growth of cucumbers due to excessive fertilization, application of unrotted organic fertilizer, and too concentrated fertilization, and even cucumber wilting and death. Before talking about targeted measures, let's first say why we use "stop loss" instead of "**", Yinong wants to emphasize again, there is really no efficient and perfect measure to treat fertilizer damage. Therefore, since it is a "stop loss", the sooner the time to take measures, the better, and the sooner you lose, the less you lose.

Because the farmhouse manure is not completely rotted, the eggs, bacteria, and viruses in the farmhouse manure enter the soil and directly damage the cucumber, causing various diseases in the cucumber. Ammonia damage can cause cucumber leaves to turn yellow and brown, and eventually cause the leaves to dry up. Cover it directly with thick plastic, the purpose of this is only one is to sterilize and rot, because there are a lot of bacteria in the chicken manure, so it is completely necessary to do this at the same time as effective sterilization, and it is also an opportunity to avoid fertilizer damage at the beginning.

You can observe some abnormal changes on the cucumber leaves, and if you have learned the relevant knowledge of cucumbers, you can directly spray the agent.

Look at what the disease is, there are not many common diseases other than downy mildew, anthracnose and mosaic virus. The first two kinds of agricultural stores have a lot of products to choose from, and the third virus, you can take a look at this....

The first is to regulate the temperature, the temperature is generally controlled at 25 30 during the day and about 15 at night;

the second is reasonable dense planting, which is determined according to the characteristics of varieties and soil fertility to prevent excessive density;

The third is to increase light, when it is cloudy and low-temperature, try to increase scattered light, carry out artificial light supplementation if possible, and carry out foliar fertilizer spraying;

Fourth, proper ventilation can discharge toxic and harmful gases, increase the inflow of carbon dioxide gas, and promote the accumulation of assimilated substances;

Fifth, strengthen fertilizer and water management and pest control.

Prevention should be the main thing, according to the respective management level to determine the cause of deformed melon, adjust the management measures, reasonable density, reasonable application of 3 fertilizers, balanced watering, temperature control, foliar fertilization, supplement cucumber plant nutrition, ensure robust growth, appropriate thinning melon, reduce the number of melons.

Cucumber melon is a situation often seen in the case of planting cucumbers, which refers to the situation that after the female flowers are produced, they cannot continue to grow and develop into product melons, and slowly turn yellow and peel off, which seriously endangers the quality and quality of cucumbers, and causes huge damage to the planters. In the early stage, if the nutrient supply of the plant is not sufficient, such as fertilizer and water ** is not enough, the moisture content of the soil layer is less than 20%, its rhizome growth and development is not easy to be very good, the expression is that the plant is weak, and the nutrient content of the female flower is not enough if it is very easy to turn melons. If the liquid fertilizer is too much, the moisture content of the soil layer is too high, especially the base fertilizer is applied too much, the plant grows vigorously, at this time, the vast majority of nutrients are used for the growth and development of branches, only a little nutrients provide fruit growth and development, if the ambient humidity of the gas is very large, it is also very easy to cause pests and diseases, and the situation is that there are many melons. The cucumber melon is actually the cucumber seedling that has already occurred and generated on the cucumber seedlings after the cucumber seedlings are produced, due to the physiological environmental hazards of the cucumber plant, which can not continue to grow and develop, and become product melons. Instead, it slowly wilts and falls off.

Conceptually, cucumber-turned melons belong to physiological withering, and melon farmers are accustomed to calling cucumber "small production". Cucumber melon can occur in the open field and greenhouse planting process, and the melon rate can even be achieved above 50% in the greenhouse. Because the total area in the greenhouse is relatively limited, many growers and friends in the case of planting cucumbers, unprincipled increase the relative density of planting, which is also a reason for the large rate of cucumber planting in greenhouses.

When the relative density of planting in the shed exceeds the relative density of the species, the roots of the underground of the plant will compete for nutrients in the soil, and the leaf stems on the ground will compete for indoor space, the leaf stems will be vigorous, the leaves will coincide, the field is closed, and the natural ventilation and light transmission are not good. For cucumbers, the relatively suitable growth and development temperature is 20-30, the daytime temperature in summer can be 37, and the ultra-low temperature of the greenhouse in winter can be as low as 10, which are all worse phenomena, all of which are not conducive to the growth and development of cucumbers.

It's caused by high temperatures. When planting cucumbers in greenhouses, if the temperature in the greenhouse is higher than 30 degrees during the day and 16 degrees at night, it is very unfavorable to the growth of cucumbers. It will aggravate the respiration of cucumbers, thus hindering the photosynthesis of cucumbers.

As a result, the cucumber plant is undernutrient and the phenomenon of melon transformation occurs, and the female flowers cannot develop normally, and it is easy to form deformed melons.

This is related to the surrounding environment, it may be related to the variety, and it may be caused by the incorrect temperature, so this situation occurs.

It may be caused by the soil, you need to treat the soil directly, be sure to choose the right variety for planting, do not plant only one plant for a long time.

Greenhouse cucumbers are planted out of season, and physiological abnormalities often occur during growth and development. Physiological abnormalities refer to the abnormal growth of cucumber plants due to abnormal management measures or unscientific management techniques. The essential difference with the disease is that there is basically no need for chemical control, and good control results can be achieved by improving the management measures that cause plant abnormalities.

According to the abnormal symptoms, find out the cause and take timely measures to ensure the normal growth of cucumbers. The symptoms and control measures of abnormal cucumber planting in the greenhouse are first, and the main manifestation of melon transfer is that the melon strips grow to 2 5 cm long, stop growing and wilting.

Causes: First, even if it is cloudy, the light is insufficient, the density is too large, the light transmittance is poor, the photosynthesis is weakened, and the nutrient accumulation is insufficient; Second, the lack of water and fertilizer and the unreasonable nutrient distribution ratio hinder the nutrition of plant growth and development, resulting in malnutrition and melon melting; Thirdly, the melons in the lower part of the plant were not harvested in time, and the nutrient supply of the female flowers in the upper part of the plant was insufficient, and the melons competed for nutrients, resulting in malnutrition and melons. Fourth, the female flowers are stunted at high or low temperatures, and the synthesis and root absorption capacity are affected at low temperatures, resulting in malnutrition and melon melting; Fifth, the night temperature is high, the humidity is high, the nitrogen fertilizer is excessive, the cucumber grows excessively, and the nutritional growth of melons is not coordinated with the reproductive growth; Sixth, pests and diseases cause leaf necrosis and yellowing, which affects photosynthesis and leads to poor growth of cucumbers.

Normally grown cucumbers produce straight, cylindrical strips with slightly pointed tips. For example, in the process of growth and development of cucumbers, they encounter environmental conditions such as malnutrition, insufficient light, and poor management, especially in the process of off-season cultivation in greenhouses, because some conditions cannot meet the requirements of cucumber growth, melon strips are often deformed, which affects the commodity value and yield of cucumbers. Curved melons.

It is mainly manifested as the middle of the melon strip bending to one side. First, the planting is too dense, the site is closed, and the ventilation and light transmission are poor; second, the soil is arid, lacking in fertilizer, water and nutrients; 3. Insufficient light, too high and too low temperature; Fourth, the tendrils are not tied in time, and the elongated melon strips are caused by the stem tendrils and petioles, which cannot be drooped and elongated.

Potted melons. It is mainly manifested as swelling and thickening from the middle to the top of the melon strips. First, malnutrition, especially when nitrogen, potassium, iron and other elements in the soil are insufficient, is caused by weak plant growth and low dry matter accumulation; second, the pollination of female flowers is insufficient, and the fertilized seeds expand too quickly; Third, in the process of expanding the same melon, the water shortage in the early stage and the sufficient water supply in the later stage are caused.

Sharp-billed melon. The main manifestation is that the melon strips gradually become taper and sharp from the middle to the top. First, the soil is dry, the salt concentration is too high, and the absorption of nutrients and water is blocked; The second is that the female flowers are not pollinated, and the parthenogenesis is caused by the absence of seeds near the navel.

Melons with thin waists. The main manifestation is that the melon strips are thin in the middle. Cracks appear in the pulp of the thinned part of the longitudinal profile.

First, high temperature and drought, insufficient water supply, and weak growth is easy to produce fine waist melon; The second is boron deficiency or obstruction of boron absorption. Thirdly, pollen development is not normal.

Now many vegetables will choose to be planted in the greenhouse, which belongs to the off-season planting method, therefore, vegetables often have some physiological abnormalities, cucumbers are planted in the greenhouse, the growth and development may be abnormal, the fruit is distorted, and the branches and leaves may be yellow, resulting in a poor yield.

Normally grown cucumbers produce straight, cylindrical strips with a slightly pointed tip. For example, in the process of cucumber growth and development, environmental conditions such as malnutrition, insufficient light, and poor management are encountered, especially in the process of off-season cultivation in greenhouses, melon strips are often deformed due to certain conditions that cannot meet the requirements of cucumber growth, which affects the commodity value and yield of cucumbers.

In the middle and late stages of cucumber growth, plants often have premature senescence, which is mainly manifested by root senescence, leaf yellowing, plant atrophy, stunted growth of cucumber, and even death in severe cases. With the extension of growth time, cucumber roots senes; As the temperature rises, improper watering can also damage the root system. If the mortality rate of old roots is greater than the growth rate of new roots, the number of roots is severely insufficient and their ability to absorb water and fertilizer is reduced.

Blind application of a large amount of chemical fertilizers makes the soil solution concentration too high, causes damage to the root system, weakens the absorption capacity of the root system, and affects the normal growth of plants; Some vegetable farmers believe that the seedlings are about to be uprooted, so they reduce the frequency of watering and fertilization, resulting in a shortage of fertilizer and water; These can lead to premature aging of cucumbers.

The suitable temperature for the growth of cucumber plants is 25 30 . When the temperature exceeds 35, heat damage will occur, resulting in burns of cucumber stems and leaves, white spots, severe dryness of leaves, affected photosynthesis, and poor plant growth. As the cucumber grows longer, the number of bacteria and eggs in the greenhouse increases.

Powdery mildew, anthracnose, downy mildew, bacterial leaf spot and grape wilt were aggravated in the middle and late stages of cucumber growth. Pests and diseases aggravate the damage of cucumber stems and leaves, increase the number of leaves of diseases and insects, reduce the photosynthesis of leaves, and make the stems and leaves wilt in advance, which often leads to the abnormality of melons and diseases. In cucumber management, the temperature inside the greenhouse should not exceed 25 to maintain the root system and promote root growth.

The watering time should be carried out before 10:00 in the morning, and it should not be watered in the afternoon to prevent the ground temperature from being too high and the water temperature from being too low to cause damage to the root system; For greenhouses with hardened soil, plastic film can be removed, and shallow tillage and hoeing can be carried out to improve the permeability of the soil and promote deep rooting and normal root growth. When the temperature in the shed exceeds 30, air should be released for cooling.

When the temperature is high in the afternoon, a large air outlet should be added. If the temperature in the shed remains high after the top air is released, some or all of the bottom air can be released depending on the temperature. Irrigation and cooling can be done in combination with weather conditions and soil moisture.

Irrigation and cooling should be carried out in advance. Frequent irrigation with a small amount of water should be used to prevent heat damage to stems and leaves. Shade netting can be covered in time.

After the shading net is covered, the shed temperature can be reduced by about 5. However, it should be noted that this method can only be used in high temperature and strong light, and the shade net should be pulled up in time in the afternoon or when the light weakens on a cloudy day.

The temperature of the greenhouse can not be too high, nor too low, to be reasonable fertilization, in the fertilization can make potassium fertilizer, phosphate fertilizer, nitrogen fertilizer, boron fertilizer or natural fertilizer manure, in the fertilization of a small amount of multiple applications, but also to reasonable watering, 3 5 days watering once.

To prevent cucumbers from going to bed early, we can do a good job in water and fertilizer management, spray pesticides on cucumbers regularly, prevent insect pests, and keep the temperature in the shed ventilated and breathable.

It is necessary to manage water charges reasonably, and to water in a timely manner, to avoid high temperature weather, and to keep the temperature in the greenhouse at about 25 degrees, not more than 30 degrees.