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Improved microclimate cucumber multi-colon
The formation of female flowers in early greenhouses and the early date of fruiting and fruiting dates are directly related to the market's early arrival and yield. The lower the first female flower node of spring cucumber, the more female flower formation and flowering, the higher the previous crop yield. However, the formation of female flowers in cucumber, in addition to its variety characteristics and nutritional status, is more restricted by the microclimate conditions of cucumber seedlings in greenhouse. Therefore, improving the microclimate status in greenhouses is an effective way to fight for early cucumber opening, more female flowers, more melons, and morning markets. The first is to regulate the temperature of the cotyledon of cucumber seedlings. The temperature should be about 28 degrees Celsius, and the night temperature should be 20-24 degrees Celsius; the temperature of the true leaf should be 20-25 degrees Celsius, and the night temperature should be not less than 16 degrees Celsius; Slightly lower, conducive to promote control of fruiting melon; After sowing temperature is about 25 degrees Celsius, is conducive to photosynthesis, night temperature 13 - 15 degrees Celsius, to inhibit respiratory consumption, but should not be less than 12 degrees Celsius, so as not to cause physical barriers, resulting in melon Seedling growth stagnant. To strive for more accumulated temperature, the morning can reach 28 degrees Celsius or more can be properly ventilated, at noon can be allowed to rise to 36 degrees Celsius in the short term, down to 28 degrees Celsius in the afternoon off, so that the shelf temperature is stable at about 30 degrees Celsius to extend the appropriate time, in order to facilitate the night insulation. The second is to control the light cucumber plants are short-day, shorten the light is conducive to the early formation of female flowers, light 8 to 10 hours a day is appropriate, more than 12 hours will inhibit female flowers to promote the formation of male flowers, 5 - 6 hours, although can promote the formation of female flowers However, due to the weakening of photosynthesis, the growth of melon seedlings is unfavorable, and it is difficult to produce high yields without high-yield shelves. Third, the differentiation and formation of water-suitable cucumber female flowers requires sufficient soil moisture and high air humidity. When irrigation is conducted at the right time to increase the soil moisture content, when the relative humidity of the soil is increased from 40% to 80%, the number of female flowers can increase by one. More than doubled; air relative humidity also shows about 80% is the most appropriate. Fourth, supplemental CO2 gas greenhouses with adequate carbon dioxide gas can enhance photosynthesis, inhibit respiratory depletion, and promote the development of melon seedlings and female flower formation is quite favorable. When the air concentration of carbon dioxide in the greenhouse is 0.1%, the proportion of female flowers is significantly increased. When the carbon dioxide content increases to 1%, female flower differentiation can reach 100%. During the seedling stage, smoking in the shed and keeping it closed for 2 to 3 days and nights will have a better effect on increasing the carbon dioxide concentration in the shed. The above microclimate control measures should be carried out within 40 days of the development of cucumber cotyledons, of which the best regulation is within 10-30 days. If the differentiation is too late, female flower differentiation has been established, and the effect of early flowering, more female flower opening, and more fruiting melons will not be achieved.