After the sweet cherry is covered with film, the temperature in the shed rises quickly and the ground temperature rises slowly. In order to maintain the balance between underground and above-ground temperature, ground cover warming can be performed with a full transparent film at the same time as or in advance of coating. The temperature within the shed is 18°C～20°C within one week and the temperature is not lower than 0°C at night; the night temperature rises to 5°C～6°C after 7 to 10 days, and 20°C～22°C during the day.
Germination to flowering, the ground temperature requirements l4 °C ~ 15 °C. Covering the film in the shed can allow the ground temperature to reach 14°C 10 days in advance. The temperature is 6°C to 7°C during the night and l8°C to 20°C during the day. The temperature at night in flowering period is 5°C～7°C, and 20°C～22°C during daytime is appropriate. Too high or too low are not conducive to pollination and fertilization. This period should strictly avoid temperatures below -2°C and high temperatures above 25°C. Xiehua period temperature during the day 20 °C ~ 22 °C, night 7 °C ~ 8 °C.
Fruit enlargement period, daytime air temperature 22°C～25°C, nighttime 10°C～12°C, is good for young fruit enlargement, can mature earlier. The fruit ripening and coloring period, the daytime temperature does not exceed 25 °C, nighttime 12 °C ~ 15 °C, maintain the temperature difference between day and night about 10 °C. Strictly control the daylight temperature, not more than 30 °C, otherwise the fruit coloring is bad, and affect flower bud differentiation.
The temperature in the greenhouse is mainly regulated by switch ventilation windows, operation doors and uncovering straw curtains. After the greenhouse is covered with membranes for 1 to 3 days, the ventilation windows and operating doors are fully open, 4 to 7 days are opened overnight, and 8 to 10 days are gradually covered. When the temperature in the shed is too high in the later period, it is necessary to strengthen ventilation and ventilation for 10 to 15 days, and the temperature should not exceed 25°C.
Under normal circumstances, after the film, the germination period, the fruit expansion period watered once. It should be noted that the last watering should not be excessive, otherwise it is prone to cracking. After the watering, the cultivator loosened soil in time.
From the initial stage of coating to the germination stage, the relative humidity of the air in the shed is maintained at about 80%. Air humidity is low, germination and flowering are irregular, and it is also susceptible to high temperature hazards. During this period, water can be sprayed on the trees to increase air humidity. Air relative humidity in flowering period is 50%～60%, too large and too small are not conducive to pollination and fertilization. The relative humidity of the air during fruit ripening is 50%, which is not conducive to coloration.
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