In the winter cucumber management, low-temperature refining and high-temperature nutrition are the key management measures for strong growth, anti-freezing and increased yield.
Low-temperature refining can enhance the ability of plants to withstand low temperatures. The low temperature refining can be carried out 7 days before the seedlings are planted. The specific temperature control is: the shed temperature is 18-20 °C during the daytime, the temperature is controlled at 10-12 °C at night, and the low temperature of 8-10 °C for a short time can further enhance the resistance of the seedlings. Inverse, improve survival rate. The ground temperature is controlled at 17-18 °C during the day and 10-12 °C during the night.
At low temperature, it is necessary to pay attention to the fact that the temperature of the shed and the ground temperature cannot be too low. Long-term low temperature and ground temperature will affect the physiological functions of the root system. In the early stage, the illusion of strong growth is shown, while in the later stage, the phenomenon of “flower topping†and seedling aging affects the growth and development of cucumber.
In addition, the cucumber should be planted after the seedlings are slowed down. Thereafter, in order to ensure the continuous planting of the melon and improve the quality of the melon, the management concept of high-temperature melon should be established.
High-temperature melons refer to the higher the temperature of the greenhouse, the higher the photosynthetic efficiency of the plants, and the more nutrients the melons receive. High-temperature melon is also a coordinated combination of temperature and humidity control in the shed. The specific operation is: the temperature in the shed is slightly higher (38 °C) during the cucumber melon period, which is conducive to the growth and development of melon strips. However, if the temperature is too high, the growth of cucumber will be affected. When the temperature in the shed reaches 38 °C, the photosynthetic efficiency of the plant is the highest, but the growth of the plant will be affected if it exceeds 40 °C. If the temperature exceeds 40 °C for a long time, the plant will have symptoms of wilting. Therefore, we should pay attention to the temperature change in the shed, and use the vent to keep the temperature inside the shed at around 38 °C. This will not only benefit the growth of cucumber, but also reduce the relative air humidity in the shed, thus reducing the occurrence of diseases. It should be pointed out that another key to high-temperature melons is to ensure adequate carbon dioxide. In the current greenhouse cultivation, the problems of water, fertilizer and light are easy to control, and there are many problems in the improvement of carbon dioxide concentration. Therefore, when the contradiction between heat preservation and ventilation cannot be solved, it can be solved by supplementing carbon dioxide gas fertilizer.
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