After the preservation and insulation were entered in May, the night temperature gradually increased to above 15°C, so the shed no longer needed covering for insulation. Now many vegetable farmers have begun to dry the shed cover and begin to store it. Here, let’s talk about how to do a good job in the safe storage of the shed cover.
The cover must be thoroughly dried before storage. The shed surface cover must be dried and dehumidified before being put away for storage, otherwise it is easy to cause the material to rot due to moisture and reduce the service life of the cover. Vegetable farmers often do a good job of waterproofing the upper layer of the cover, but another important reason for the cover to get damp is caused by the moisture in the shed. Therefore, the cover should be thoroughly dried before storage.
There are two drying methods: one is to remove the straw curtain or the insulation and place them on the open ground to dry. Although this method is troublesome, it can have a longer drying time; the other is to put the cover in the high temperature period at noon. Put it down as a whole for short-term drying. This method is labor-saving, but it needs to be divided into several times.
At present, vegetable farmers mostly adopt the second method, but there are certain misunderstandings. The author reminds vegetable farmers to dry the mulch thoroughly without affecting the growth of vegetables in the shed. The following two aspects can be considered: The first is Aired at noon many times. Before 10:30 in the morning and after 2:30 in the afternoon, the light intensity is suitable, it is the time when the photosynthesis of vegetables is ******, so this time period should be avoided. ****** From 11:00 to 2:00 noon, the stomata of the leaves are closed. During this period of time when photosynthesis is weak, it not only dries quickly, but also plays a role in shade and cooling. The second is not to block the air outlet. Avoid opening the air vents during drying to avoid poor ventilation in the shed, and at the same time prevent the humidity in the shed from affecting the drying.
In order to prevent the quilt from rolling off the back wall, the quilt must be stabilized with supports. In order to avoid the impact of extreme rainfall on the insulation quilt, vegetable farmers will choose a higher terrain to store the insulation quilt. The author has learned that many vegetable farmers have put heat insulation on the back wall of the greenhouse. Although this will not be affected by precipitation, once the support is unstable, it is likely to cause a large amount of insulation to be rolled down from above.
Therefore, to store the heat preservation quilt in this way, the support should be reinforced to ensure sufficient support and stability. ****** Do not use wooden sticks as supports, choose columns, slabs, etc., and ram the bottom of the supports.
The covering stored on the bracket should not be too heavy. The author found that many vegetable farmers who use the rear-mounted roller shutter store the covering in the angle formed by the support rod and the rear roof of the greenhouse. Although this storage is very convenient, it should be tailored to different situations. Insulation quilts made of non-woven fabrics, foamed polyethylene and other materials are light in weight and can be stored in this way. However, it is not suitable for such storage in greenhouses that use new thermal insulation as a cover.
Due to the huge weight of the insulation blanket, it will affect the stability of the roller shutter frame. It is understood that there are two types of brackets for rear-mounted roller shutters: movable and fixed. The movable type can be removed in summer to protect the rear roof and slope, while the fixed roller shutter bracket is inserted through the rear roof. It is fixed on the column in the shed and cannot be disassembled. If the weight of the insulation quilt is too large, it may cause deformation of the bracket, and even crush the rear wedge pillars in the rear roof, which will affect the load-bearing capacity of the rear roof.
Under heavy pressure, the perforation of the roof after the support rod passes through will expand, which is not conducive to waterproofing. Once water enters, it will cause serious damage to the rear roof. Therefore, the weight of the cover must be considered when using this method to store the cover.
Roof storage coverings should be reinforced front and rear. Some vegetable farmers who use strut-type roller shutters or bridge-type roller shutters store the cover by rolling it up and pulling it to the highest point of the roof. This method is very labor-saving. However, the author reminds the vegetable farmers that the front and back of the mulch needs to be reinforced.
There are two main reasons for this: The first is that short-term strong winds often occur in summer, which poses a threat to objects at high places. The second is that the storage location of the covering is at the top of the shed, which is equivalent to placing a cylinder on the top of the triangle, which has poor stability. Last year, some vegetable farmers in Shouguang City, Shandong Province caused the covering to roll off as a result of this situation, which not only made the roller shutter machine scrapped on the spot, but also damaged the shed film and steel wire, causing heavy losses.
If the storage method is shed, it is recommended that the vegetable grower must be fixed before and after. That is, after the cover is pulled to the roof, put a soil bag every four or five meters on the front and rear sides as a barrier. The soil bag must be covered by the cylindrical cover to prevent it from moving and falling when encountering strong winds. The situation arises.
Pay attention to waterproofing and anti-rodent work. After placing the covering, you need to do anti-rodent and waterproof work. The stacked insulation quilts can be sprayed with anti-rodent agents on the bottom and between each insulation quilt to prevent rats from biting the insulation quilt. Regardless of the storage method, laying more old membranes for waterproofing is the most important. The covering can also be wrapped with non-woven fabric and old film to prevent the excessive aging of the covering caused by high temperature sun exposure.
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