In order to gain high yields, some cucumber growers blindly increased the amount of dipped melons and retained melons, which "looted" plant nutrition, resulting in the general growth of cucumbers in the later stages of growth, yellowing of leaves, shortening of melon strips, and uplift of melon When the situation is serious, the "resting seedling" phenomenon of melon topping occurs. If the management is not strengthened, the loss is quite serious.
Reasons for "Xiao Yang"
Too much melon retention In order to increase yields, vegetable farmers often take inappropriate measures. All melons that can sit are left behind, and the extra female flowers are not removed.
Not timely harvesting Because of the instability of melon prices, vegetable farmers left melons that should have been picked on melon seedlings in order to wait for high prices, resulting in "dropping seedlings" and excessive nutrient consumption in plants.
Improper fertilization Many vegetable farmers fertilize. There are "multiple, chaotic, mixed" phenomena, especially the excessive use of compound fertilizers, which makes the soil solution concentration too high, causing root damage and weakening the absorption capacity, affecting the normal growth of plants.
Excessive pesticide application interval is too short, concentration exceeds the standard, easy to form phytotoxicity, resulting in plant leaf shrinkage, photosynthesis decline.
Improper watering When not watering, do not pay attention to the weather conditions. After watering, you will encounter a cloudy day, causing cucumber roots to be rooted, thereby inhibiting root growth and affecting the growth of the aboveground.
Precaution
When adjusting the plant, the cucumber should not fall too low at a time. The plant should be maintained at a height of about 1.5 meters to ensure that there are more than 15 functional leaves on the plant. For plants with more sitting melons, it is necessary to properly thin the melons, and leave the melons if they are not visible, otherwise it is easy to cause "breaking seedlings" in the middle and late stages. The yellowish leaves at the bottom should be removed in time to reduce nutrient consumption.
After increasing the light, even after a cloudy day, it is not possible to suddenly uncover all the thorns, and the thorns should be uncovered to avoid flashing.
Fertilizer water management In low temperature and low light weather, watering should not be too diligent, and flooding should not be flooded. Note that after watering, wait until the temperature in the shed rises to 30 ℃ before venting, and the air vent should be from small to large, and do not vent the air at one time to avoid flash seedlings. Fertilizers are flushed with water. Fertilizers containing humic acid or amino acids that are easily absorbed by cucumbers should be applied. One-time dosage should not be excessive.
Prevention and treatment of diseases Greenhouse cucumbers are prone to downy mildew, brown spot disease, gray mold disease, bacterial corner spot disease, etc. For these diseases, we must adhere to the prevention-based and comprehensive control methods to ensure that there are no susceptible plants in the shed. When using drugs, we must strictly control the concentration of use, and do not mix three or five pesticides to reduce the occurrence of drug damage.
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