Correctly exposing grasshoppers is extremely important for the production of vegetables in winter greenhouses. Here, farmers are reminded to pay attention to science.
Morning exposing the grass: Many farmers believe that the sun shines on the shed. However, according to the extent to which it was revealed, most vegetable farmers could not answer it.
In the morning, uncovering the grass can not be judged by the temperature in the shed to determine if the time is right. The method is: the temperature in the shed will be reduced, but the temperature cannot drop by more than 1°C, indicating that the temperature exceeds 1°C. It was too early; the temperature in the canopy was not lowered, indicating that the grasshopper was late.
Afternoon, grass cover: At present, the farmers cover the grass in various conditions in the afternoon, some covered by the sun, some covered in the afternoon from 3:30 to 4:00, in fact, these are not science, should be based on the shed to determine the temperature Awkward time. The method is: when the temperature in the shed reaches 17°C-18°C, the grass cover will begin to cover, and the temperature in the shed may increase after the cover is covered. It is advisable to increase the temperature by no more than 1°C.
For a long time, it is clear and clear: The long-term low temperature, rain and snow are sunny even after a cloudy day. Do not open all the grasshoppers to prevent “flashing seedlingsâ€. The first three days should be spent on exposing the flowers (every time, one or two, or two, one), and the area opened will gradually increase. After two days, all of them will be uncovered (the shed can be opened first and then gradually enlarged).
Radian Plus Laser Tracker,Laser Tracker Data,Accuracy Measurement Laser Tracker,Adaptive Control Laser Tracker
Automated Precision Inc. , https://www.apiasean.com