Do you understand the four main points of high-yield cultivation of cucumber? How to prevent the yellowing of leaves?

Cucumber is one of the main vegetables in summer in China. It likes warmth and is not tolerant to cold. It belongs to the family Cucurbitaceae and is monoecious. Its flowering and fruiting period is usually in summer. Cucumbers taste refreshing, sweet and crisp and are loved by people of different ages. So do you know the four main points of cucumber high-yield cultivation? How to prevent the yellowing of leaves?

What are the four main points of high-yield cultivation of cucumber?

1. Select suitable varieties

High-yielding varieties with strong disease resistance, many female flowers and strong fruit setting, such as Jinyan cucumber, should be selected.

two。 Budding, sowing and planting

To accelerate the germination of cucumber seeds should be 2 to 3 days before sowing, in order to let the seeds bear the temperature evenly, often turn the seeds, usually about 24 hours will sprout. When you find that the seed is slightly exposed to the bud tip, the temperature can be maintained at about 25 degrees Celsius.

After all the buds come out, you can sow. When sowing, it is best to let the buds face the same direction. After sowing, cover the soil immediately. The planting time of cucumber seedlings is usually chosen in sunny weather.

3. Strengthen management

(1) temperature management in greenhouse

Early spring, the temperature is low, if you plant early, you can consider a few more layers of film cover. About a week after planting, the greenhouse should be sealed at this time, which can promote slow seedling.

(2) humidity management

If it is in a sunny day, the humidity in the shed can be controlled at 55% to 65%, and the humidity at night can be maintained at 85% to 90%. If it is on a cloudy day, the humidity can be maintained at 70% to 85% and at night at 90% to 95%.

(3) Fertilizer and water management

At the initial stage of planting cucumber seedlings, we should remember to water enough seedlings, which can effectively promote early survival. After living to the late stage of cucumber growing, we must remember to control watering, and then squat seedlings.

4. Prevention and control of diseases

The common diseases of cucumber in greenhouse are mainly downy mildew (can be sprayed with Bordeaux solution), cucumber anthracnose (can be sprayed with 80% Dysen zinc 800 times, etc.), cucumber powdery mildew (can spray 200 times wettable sulfur powder suspension), and so on.

Second, how to prevent the yellowing of cucumber leaves?

1. Prevention and control measures of cucumber leaf yellowing caused by the change of external environment.

When the temperature, humidity and light suddenly change too much, it will cause the physiological yellowing of cucumber leaves. The way to prevent and cure this situation is to make the growth environment of cucumber meet the growth needs of cucumber. Cucumber is a typical temperature-loving plant, and its suitable temperature for growth is 10-32 ℃. The requirement of suitable temperature is higher in daytime, about 2532 ℃, and lower at night, about 15,18 ℃. The optimum temperature for photosynthesis is 2532 ℃. Therefore, if the above environmental conditions are met, the yellowing of cucumber leaves can be prevented.

2. Prevention and treatment of yellowing of cucumber leaves caused by too much watering and too much water.

When this happens, the leaves of cucumber plants will generally turn yellow, especially the top leaves are small, grow slowly, and wilt when serious. The most suitable soil relative humidity of cucumber is 85%-90%. Cucumber has a strong adaptability to air humidity, and the night air relative humidity of 90%-100% can be tolerated, but diseases are easy to occur if the humidity is too high and the time is too long. Therefore, do not water the cucumber many times, in case the root system can not grow normally and rot because of too much water and lack of oxygen.

3. Prevention and treatment of yellowing of cucumber leaves caused by excessive fertilization.

Although there is a lot of demand for nutrients in the process of cucumber planting, the supply of fertilizer can not be increased arbitrarily, if too many nutrients are supplied, it will cause excess nutrients in cucumber plants and cause yellow leaves. Therefore, the fertilization of cucumber needs to be carried out according to different growth stages, such as using seedling fertilizer at seedling stage, suitable amount of balanced element fertilizer 20-10-20, balanced and high potassium fertilizer 20-20-20 and 15-15-30 in the middle and later stage. It can be applied once or twice at the seedling stage, and the nutrient demand can be met by applying it every 10 to 15 days in the middle and later stage. the absorption and effect of available water-soluble fertilizer is faster than that of traditional fertilizer, and the yield is obvious. Of course, the base fertilizer before planting cucumber is essential, pay attention to apply more organic fertilizer and microbial fertilizer.

4. Prevention and treatment of yellowing of cucumber leaves caused by lack of medium and trace element fertilizer.

Cucumber also has a lot of demand for trace elements, such as magnesium, boron, iron, zinc, calcium and so on. If there is a large shortage of these elements, it will reduce the quality of cucumber plants and fruits, so it is necessary to supplement these trace elements in the process of topdressing in the middle and later stage. Cucumber special foliar fertilizer can be sprayed to comprehensively supplement the nutrients needed for cucumber growth, so as to improve the quality of cucumber plants and cucumbers, and enhance the resistance of cucumber plants to common diseases.

5. Control measures of cucumber leaves yellowing caused by diseases and insect pests.

When cucumber diseases and insect pests occur, the symptoms mostly occur on the leaves of the cucumber growing point, which will cause yellow-green mottled mosaic. The occurrence of cucumber diseases and insect pests will cause the leaves to turn yellow, so it is necessary to add fungicides when spraying foliar fertilizer every day, kill two birds with one stone, control nutrients and diseases at the same time, prevention is more important than treatment, and keep the diseases and insect pests away from the cucumber plant completely.

Time: 2019-03-14 Click: