First, the higher the temperature required for cucumber, the better.

Generally speaking, the suitable night temperature of cucumber is 15-18 °C, and the daytime is about 32 °C. However, cucumber can still grow normally at higher temperatures. In the range of 38-40 ° C, although photosynthesis is strong, the respiration is equally strong. The accumulation of actual photosynthetic products is preferably 26-30 ° C. In this temperature range, the higher the temperature required for greenhouse cucumber cultivation, the better. The lower night temperature helps to reduce the breathing consumption. The cucumber's expanded melon is mainly night-time, and the reduction of respiratory consumption is equivalent to “less money spent”. Naturally, the melon is high, and the yield is high. In the first half of the night, the photosynthesis products produced by photosynthesis during the day are nutrients delivered to the melon strips. Therefore, the temperature in the first half of the greenhouse is required to be 15--20 degrees. Of course, the temperature in the first half of the night can be higher, in order to let the photosynthesis products Fast delivery. In the middle of the night, cucumber mainly respirates and consumes the nutrients in the cucumber. Therefore, the temperature in the latter half of the night must not be high, generally 10-15 degrees. The purpose is to make the cucumber less weak and consume less nutrients. Generally speaking, the minimum temperature of the greenhouse at night should be above 10 °C, and should be moderately warmed below 8 °C to ensure that growth and malformation are not inhibited.

Second, as long as it is resistant to low light, it can not fill light.

Jinyou 35, Xintai Mickey and other densely thorn cucumbers cultivated in the greenhouse in winter and spring seasons should be resistant to low temperature and low light. In the case of continuous rain and snow, the light is below the compensation point, and the cucumber is in a state of “hunger”, which has a great impact on the yield. Therefore, it can be said that the illumination of the cucumber in the greenhouse in winter and spring is seriously insufficient, and it is feasible to increase the yield by supplementing the illumination. The general practice is to wipe the film often and remove the dust to increase the light transmittance. Covered by a colorless mulch film, the ground sun reflection is enhanced, and the lower middle blade receives more light. There is also a certain effect by setting the back wall reflector. However, the most effective method is to set up a special light for fixing the plant sodium lamp, etc., the general power is more than 300 watts, every 8-10 meters. The effect of incandescent lamps with low power is not obvious.

Third, only require higher temperatures, and the ground temperature is not important.

The requirement for ground temperature of cucumber is higher than the temperature. The 1°C ground temperature is equivalent to the 2°C temperature effect. The lowest temperature that is conducive to the growth of cucumber roots is 12-15 ° C, but when the ground temperature is higher than 8 ° C, the main root can still be elongated. Below 8 ° C, the main roots and root hairs are inhibited and no longer stretch. Experiments have shown that if the ground temperature is increased from 18 ° C to 24 ° C, the early yield and total yield of cucumber increased by 45% and 34%, respectively. However, if the ground temperature exceeds 32 ° C, the total output decreases. When grafted with pumpkin, the stress resistance of cucumber was significantly improved. When the ground temperature dropped to 12 °C, the root system could still grow normally. Therefore, the effect of ground temperature on cucumber is far greater than the temperature. There are many ways to increase the temperature of the greenhouse in the winter: adding crop straw and cattle and horse manure, etc., is a method of using ground heat to increase the ground temperature, and the effect is better; the ground cover and the cold ditch can also effectively raise the ground temperature. In the deep winter season, reduce the amount of chemical fertilizer application, apply organic fertilizer and biological bacterial fertilizer as much as possible, that is, increase the application of hot fertilizer, which is beneficial to increase the ground temperature.

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