In the greenhouse cucumber production, judging the growth and development of cucumber according to the appearance and characteristics of the leaves, and scientific management, although it is impossible to achieve 100% "drug to disease, Wanjin oil", but it is indeed a Simple and very efficient methods are worth promoting in production. Today, Xiaobian summed up several small methods based on the different growth periods of cucumber.
Seedling stage
1 In the seedling stage, if the tip of the cucumber leaves droops, the color green or the edge of the cotyledon turns white and curls upwards, which is caused by the sudden cooling in the greenhouse. In production, heat preservation and cold protection should be done as early as possible according to weather changes: keep the daytime temperature at 22~25°C and the nighttime temperature at 15~18°C.
2 If the tip of the blade is yellow, it may be caused by lack of water or excessive water fertilization in the soil, so it should be properly watered in management to keep the soil water holding capacity at 85~90%.
Flowering result period
1 If the leaves are shrunk, the leaves are thicker, the leaves are light yellow and dull, and the temperature is too low in the greenhouse. (Of course, there may be virus diseases. The most obvious difference between the two is that the virus disease will be large. Diffusion, and there is a disease center, while physiological diseases do not.) In severe cases, the leaf margin turns white. In production, the insulation should be strengthened to keep the temperature at 25~29 °C during the day and 18~22 °C at night. The temperature should not be lower than 13 °C to ensure the normal growth and development of the plant. At the same time, it is necessary to cultivate several times to increase the ground temperature and increase the heat capacity in the greenhouse.
2 If the blade is curled upwards and the leaf edge is light yellow, it is mostly caused by excessive temperature in the shed and excessive air humidity. This phenomenon occurs mostly in the early stage of cucumber bud. In management, ventilation should be strengthened, the amount of irrigation should be increased, the temperature should be controlled below 35 °C, and the humidity should be kept at around 75%.
3 If the blade becomes larger and thinner, the internode lengthens, mostly caused by high temperature, high humidity and low light in the shed. In production, in addition to ventilation and dehumidification, a reflective curtain can be hung on the rear wall of the greenhouse to increase the light intensity in the shed, especially at the rear.
4 If the water droplets are hung on the edge of the cucumber leaves in the morning, this phenomenon is physiologically called “spitting waterâ€, which is a normal phenomenon. However, since the disease is prone to epidemics at this time, it should be promptly applied to prevent diseases. 5% chlorothalonil aerosol can be used for fumigation in greenhouses, which can play various effects such as dehumidification, disease prevention and treatment. It is worth promoting.
Know why
Why do the different colors or shapes of cucumber leaves accurately reflect the problems that occur during cucumber development? It is because the organ morphology of plants is closely related to its function, and the tools for plant growth and morphogenesis are mainly cell division and expansion.
Correlation between plant leaf characteristics and photosynthesis characteristics:
In young organs, cell division is very common, and as the organ is examined, cell division gradually decreases until it stops completely, and then growth is completely dependent on cell expansion. In the growth history of this plant, different temperatures, humidity, carbon dioxide content, etc. have a great influence on cell division and expansion, and cell division and expansion determine the shape and material content of the leaf, which in turn It will affect the most important physiological activities such as “photosynthesis†and “change in enzyme activity in the body†of plants. Therefore, the interaction mechanism of plants gives us the opportunity to judge the development of plants by observing the shape of the leaves.
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