Cucumber is one of the longest vegetables, so the demand for cucumbers on the market is also very large. Many vegetable farmers found that the seedlings were yellow when planting cucumbers. What caused this? The following small series will give you an analysis of the causes and solutions of the yellowing of cucumber seedlings!
Reason 1: Changes in the external environment
Sudden changes in temperature, humidity, and light can cause yellowing of cucumber leaves.
Solution: Cucumber is a typical thermophilic plant with a temperature of 10 to 32 °C. The moderate temperature during the day is about 25 to 32 ° C, and the temperature at night is low, about 15 to 18 ° C. The photosynthesis temperature is 25 to 32 ° C, which should be adjusted according to the above temperatures.
Reason 2: Too much watering
Excessive moisture leads to yellowing of cucumber leaves (water yellow): the leaves of the plants are generally yellow, especially the top leaves are small, the growth is slow, and the wilting occurs in severe cases.
Solution: The suitable relative humidity of the soil is 85%-90%. The adaptability of cucumber to air humidity is relatively strong. The relative humidity of the night air can be tolerated by 90%-100%. However, if the humidity is too high, it is easy to cause disease. Watering the cucumber seedlings in order to prevent the roots from being excessively dehydrated and rotted, so that the roots cannot grow normally.
Reason 3: Excessive fertilization
Although cucumber planting has a lot of nutrient requirements, it can not increase the amount of fertilizer arbitrarily. Too much nutrients will cause the yellow leaves of cucumber plants to cause excess nutrients.
Solution: Cucumber fertilization should be carried out according to different growth stages, such as seedling stage using seedling fertilizer such as 20-10-20+TE, middle and late stage with balance and high potassium fertilizer, such as 20-20-20+TE, 15-15- 30+TE, the seedling period is generally one or two times of topdressing. In the middle and late period, it can meet the nutrient demand by 10-15 days interval. The quick-acting water-soluble fertilizer is quicker than the traditional fertilizer absorption, and the yield is obviously increased. Of course, the cucumber pre-base fertilizer is planted. essential.
Reason 4: Cucumber deficiency
The demand for trace elements in cucumber is also a lot of magnesium, boron, iron, zinc, calcium, etc. If there is a large shortage of these elements, the quality of cucumber plants and fruits will be reduced. Therefore, in the middle and late stages of topdressing, we must also consider Add to trace elements.
Solution: Spray the cucumber-specific foliar fertilizer to fully supplement the nutrients, improve the quality of cucumber plants and cucumbers, and enhance the resistance to common diseases.
Reason 5: Pests and diseases
Most of the symptoms occur on the leaves of the cucumber growing point, causing yellow-green mottled mosaics.
Solution: The occurrence of cucumber pests and diseases will lead to yellowing of the leaves together. In the daily spraying of foliar fertilizer, a fungicide can be added to it, such as a molar general-purpose fungicide, which can cure nutrients and diseases at the same time.
In the process of planting cucumber, it is necessary to pay attention to the topdressing of yellow flowers. Scientific and reasonable base fertilizer plus topdressing is an important method to promote straightening, elongation and topping of cucumber, and the application of quick-acting water-soluble fertilizer is the most efficient way to increase production of greenhouse vegetable crops. . I hope the above content will help you. If you want to know more about agricultural technology, please pay attention to the Hui Nong School!
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