The reason why the spring cucumber in the greenhouse does not bear the melon
First, the cause
1. There are more melons in production. All the melons that can sit still are left, and the extra female flowers are not removed.
2. Improper fertilization. Excessive use of compound fertilizer makes the soil solution concentration too high, which weakens the absorption capacity of the root and affects the normal growth of the plant.
3. Overdosing. In the prevention and control of pests and diseases, some vegetable farmers only pay attention to the prevention and control of chemical agents, while neglecting agricultural measures. The interval between drugs is short, the concentration is seriously exceeded, causing phytotoxicity, and the hormonal pesticides are used to cause physiological imbalance of cucumber plants. Normal growth.
4. Improper watering. Watering does not pay attention to weather conditions, and does not analyze the pros and cons of watering according to the growth law of plants. If it is affected by adverse weather such as cloudy weather, low temperature and strong cold current after watering, the ground temperature is lower than 12 °C, and the relative humidity of the soil is higher than 85%, causing the roots of cucumber to be rooted, thereby inhibiting the growth of roots. The growth impact is greater.
5. The harvest is not timely. Because the price of melon is unstable, sometimes in order to wait for the high price, the melon that has grown up is left on the melon, causing "falling." The result is that the balance between vegetative growth and reproductive growth of the plant is broken, and the organic nutrient consumption in the plant is excessive. Second, preventive measures
1. Falling vines should be appropriate. When the cucumber is falling, it cannot be too low, and too low is not conducive to the normal growth of cucumber. After the vines are planted, the cucumber plants are maintained at a height of about 1.5 meters, ensuring that there are more than 15 functional leaves on the plants to ensure normal photosynthesis and maintain normal growth.
2. Pay attention to the thinning and fruit thinning. For plants with more melons, it is necessary to properly dispose of the melons, and the melons are not visible. Otherwise, it is easy to cause the middle and late periods to rest. The yellowed leaves at the bottom should be removed in time to reduce consumption.
3. Strengthen the lighting management even in cloudy days. When the cloudy day approaches the noon, the grass is opened. If the wind is properly released for 2 hours, it will not lower the temperature of the shed, but will increase by 2 °C. After even a cloudy day, you can't suddenly uncover the grasshoppers. You should "uncover the flowers" to avoid the phenomenon of "flashing seedlings".
4. Pay attention to fertilizer and water management. When the temperature is low and the light is weak, the number of watering can not be too diligent. Generally, water can be poured in about 20 days, and it is not possible to flood the water. Also note that after watering, wait until the temperature in the shed is raised above 30 °C to release the air, and the air outlet should be small to large. Do not let the air blow too large at one time, causing the phenomenon of “flashing seedlingsâ€. Fertilizers are generally applied with water. Fertilizers containing humic acid or amino acids that are easily absorbed by cucumbers should be applied. The dosage should not be too much.
5. Strengthen disease prevention and treatment. Because the wind is not timely, it is very easy to cause phytotoxicity after spraying in the shed. Therefore, the concentration should be strictly controlled when using the medicine. Do not mix three or five kinds of pesticides to reduce the occurrence of phytotoxicity.
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