Shed snow removal
Snow-sweeping work is also a science. Whether using snow blowers or manual snow-sweeping, the sun-panel greenhouse should be based on whether it freezes or not. Pay attention to the following three points:
1. When there is no icing, clean early when there is little snowfall, or when the temperature is low, there will be no icing. At this time, the snow should be cleaned in time; when the snowfall is large, the snow should be cleaned to prevent accumulation The thick snow collapsed the greenhouse. Cleaning the snow can not only prevent the shed from being crushed, but also prevent the snow from freezing again after melting, so as not to cause inconvenience to snow removal and rolling up the floating film. At the same time, the snow around the shed should be cleared in time, and the ditch should be cleared and drained to prevent the hazards of snowmelt.
2. Cleaning after the ice is melted. In the case of icing on the surface of the floating film caused by the melting of snow, when there is little snowfall, you can wait until the sun's temperature rises and the icing melts before cleaning; and when the amount of snowfall is large, it is best to clean first Snow in the middle and upper layers can reduce part of the pressure in the shed, and then repeat the previous cleaning work.
3. When sweeping snow, you should sweep the snow from bottom to top. You should not push the snow blindly from top to bottom. This will cause the snow at the front of the greenhouse to not slide down in time, resulting in an overburden, and collapse in severe cases. Therefore, vegetable farmers should first sweep the lower part of the shed when sweeping snow, and then sweep down from the upper part, so as to prevent the front face of the shed from collapsing under excessive pressure.
Insulation is aired
1. The number of rainfall and snowfall has increased, and the covering of many greenhouses has failed to cover the floating film in time or the protection measures are not in place, resulting in water ingress. After the cold wave, when the weather is clear, many vegetable farmers will begin to dry the grass thatch or heat preservation quilt. Some start to dry at 9 a.m., and the entire shed is covered with heat preservation quilts for drying. In fact, the drying time and method are all There is a misunderstanding.
2. First of all, the drying time is wrong. During the interview, the author found that many vegetable farmers began to put down the mulch to dry at 9 o'clock in the morning. This time happened to be the stage when the photosynthetic efficiency of vegetables began to rise. Drying at this time will undoubtedly affect photosynthesis. It reduces the storage of photosynthetic products. In fine weather, around 12:30 noon, the illuminance is generally between 50,000 and 60,000 lux, which is close to the light saturation point of vegetables, and the increase in photosynthetic rate is small. Then, you can choose to dry between 12 o'clock and 13:00.
3. Secondly, the air-drying method does not dry the whole shed grass thatch or the heat preservation is all lowered for air-drying, which shortens the light receiving time of the vegetables and is unfavorable to the growth of vegetables. At present, most of the greenhouse covers are grass thatch and heat preservation quilt. The artificial grass thatch cover is mostly arranged in the shape of "product" or in an overlapping manner. When drying, it can be divided into two parts. Get up and dry at intervals. As for the grass thatch and heat preservation quilt using the roller shutter machine, since the lower end has been fixed to the roller rod of the roller shutter machine, and the heat preservation quilt is also fixed between two adjacent beds, it is not practical to disassemble and dry. It can be air-dried at noon, first 1/3 is lowered to dry, and then lowered to 1/2, and the remaining part can not be air-dried separately, and the purpose of drying can be achieved by daily operation.