Facilities Strawberry Evening Clouds

In the winter and spring seasons, there is often continuous overcast weather. The light intensity in the shed is extremely low. The relative humidity of the air is above 95% and the indoor temperature is below 15°C. For several days on a cloudy day, the environment limits the photosynthetic activity of strawberry leaves and reduces photosynthetic yield. This will result in low fruit setting rate, young fruit growth, and abnormal fruit production. Fruit production will decline and fruit ripening will be postponed. Therefore, the strawberry in the greenhouse should grasp the following points when it is cloudy:

First, a reasonable release. Even at noon on a cloudy day, as long as the temperature is not reduced after the drafting, the herbicides should be adhered to, which will encourage the plants to receive scattered light, increase the ability of the plants to adapt to the light, and help increase production. If the time for the cloudy days is short, once the weather is clear, the light is strong after exposing the grass, and the temperature rises sharply. The water transpiration of the strawberry plants is accelerated, and the root absorbs water slowly, and the leaves will appear wilt. Do not immediately pull all the grasshoppers apart, but open them one at a time until 1 or 2 pm to uncover the rest of the grasshoppers. The temperature in the shed slowly rises, allowing the strawberry to adapt to prevent strawberry disease. If no measures are taken, permanent wilting will occur. When the wilting is found, immediately lay down the grasshopper and wait until the leaves recover and then roll up again. When the wilting occurs again, let it fall again. Repeating several times, the leaves will recover quickly and the wilting time will be short until they no longer wilt. When the wilting is heavy, it is also possible to spray water on the leaves so that the leaves can absorb a part of the leaves and alleviate the water deficit. This has a good effect on shortening the wilting period.

Second, appropriate heating. Even warming the facilities to the strawberries should not cause the temperature to be too high, especially the night temperature should not be too high. Because the night temperature is high, the breathing is strong and the consumption is high. Even if the drafting curtain is exposed during the day, the nutrients produced are not much, and they cannot withstand the night-time consumption. Heating is generally performed at night and ventilation is performed for short periods of time before and after noon. The daytime temperature in the control room is around 20°C (not to exceed 25°C), and the minimum temperature at night is above 10°C. If the seedlings are small, it is better to add a small shed in the greenhouse so that the soil temperature drops less, and the degree of wilting can be greatly reduced after clearing.

Third, reduce the humidity. Waterproof trenches shall be provided at the front edge of the greenhouse, and a plastic film shall be laid at the bottom of the trench. The water flowing down the membrane shall be drained out of the shed or perforated into the ground. The relative humidity of the air in the shed is controlled to be below 85% in time, which can effectively control the germination of most fungal spores and thus control the occurrence and infection of strawberry fungal diseases. After the strawberry is planted, the entire film is covered in the shed and all the ground in the shed is closed to minimize evaporation of soil moisture. After watering under the membrane, close the water inlet to prevent moisture from evaporating and leaking. The ground film hole at the junction of the ground stems should be sealed with soil. When the humidity in the greenhouse is too large, straw or wheat bran can be laid between the rows of 20 to 25 cm thick, which can absorb excess moisture in the greenhouse, absorb heat during the day, and increase the temperature in the night shed.

Fourth, increase lighting. In the strawberry shed, a light curtain with a width of 1.5 meters is placed on the north low light back wall, which can significantly enhance the light on the north side of the shed and enhance the photosynthesis of the plants. An incandescent lamp can also be used as a light source for additional lighting. Each 100-watt lamp measures approximately 7.5 square meters. The lamp holder is located at a height of 1.8 meters from the end of November to mid-February, every day from 5 pm to evening. 10 points, plus 5 to 6 hours, can increase 15% to 30%. Abnormal fruit loss by 50%, such as simultaneous indoor heating, can increase production by 30% to 50%.

Fifth, auxiliary pollination. In the strawberry flowering period, artificial pollination can be conducted, indoor bees can also be placed, and pollination by honeybees can have a multiplier effect of pollination.

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