2) Humidity. Cucumber hi wet drought. General requirements for soil moisture is 60%-70%, air humidity is 80% during the day and 90% at night. If the soil moisture reaches 60%-70% and the air humidity is about 50%, it will not cause bitterness. However, when the humidity is over 80% and the humidity exceeds 80%, a water film forms on the leaves and interferes with gas exchange. Light has a refractive effect and is conducive to the formation of bittersin. In the production, attention should be paid to ventilation, on the one hand, it can increase the content of carbon dioxide, on the other hand, it can reduce the humidity in the room and avoid the formation of water film on the leaves and the refraction of light, resulting in an increase in bitterness.
3) Lighting. In production management, light fill is as important as temperature and humidity control. To achieve reasonable close planting, no more than 4 200 plants per acre, especially on cloudy days, artificial light is very important. Hanging reflective film in the greenhouse is an effective way to add light. In the cloudy days, under the premise of no ice on the shed film, it is necessary to ensure normal exposure to increase the absorption of scattered light.
4) Fertilizer. Rational fertilization can adjust the physiological basis of cucumber plants and promote growth and development. Single fertilization, especially nitrogen excess can easily induce the formation of somatotropin. Cucumber is a kind of vegetable with more roots and more fertilizer. In the production process, in addition to applying enough organic fertilizer, inorganic fertilizer should be applied sparingly, and the ratio should be reasonable. It is generally believed that N:P is l:0. .5 is more appropriate. In the application method, enter the full fruit period combined with watering for topdressing, applying 6~7 kg per mu. Spraying 0.3% ferrous sulphate 1 or 2 times at the seedling stage can enhance the assimilation of plants.
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