Strawberry is cool and not resistant to high temperature and drought. The main management measures for summer are:
Irrigation and moisturizing, shading and cooling of strawberry roots are shallow, drought resistance is weak, and the leaf area is large, evaporation is relatively strong, it is easy to cause stems and leaves withered and died. Therefore, when the local surface is cracked, it should be irrigated at night, and unconditionally irrigated plots should be watered every morning and evening to keep the soil moist and reduce the surface temperature. It is best to spray with new high-fat membranes and form on the plants and the ground. A protective film protects the plants and the surface from moisture evaporation. You can also put a shade of about 1 meter on the surface of the raft, cover the grass with some grass, and plant some high-stalk crops, such as corn, on the edge of the stalk, but not too dense, so as to avoid insufficient ventilation and affect the normal growth of strawberries. During the summer and autumn growth after directional manure harvesting, the stolons will produce 3-5 seedlings. If no new seedlings are to be propagated, they should be removed in time to avoid consumption of the mother plants and reduce the yield of the next year. The strawberry nursery for breeding seedlings, in order to make each seedling grow into a strong seedling, in the seedling period, the stolons should be straightened in time, and the soil is slightly pressed to promote new roots. The new root part of strawberry in the cultivating soil has the characteristics of increasing growth year by year. Therefore, the new plant should pay attention to the base soil after 1 year of growth, mainly after the fruit harvesting and before the occurrence of a large number of new roots. The thickness of the soil is suitable for exposing the seedlings. The cultivating can be carried out in combination with topdressing and soil cultivation to remove weeds. The main pests for controlling pests and diseases in summer are cockroaches. You can use 800 times of trichlorfon solution plus 800 times of new high-fat film or 1000 times of dichlorvos plus 800 times of new high-fat film.
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Venlo structure is a popular one at present. This architecture uses horizontal girder as main bearer, forming a stable structure with columns. There is consolidation between horizontal girder and column, and hinge is used to connect column and foundation.
In Venlo greenhouse, foundation is made of reinforced concrete and the side wall is made of brick or reinforced concrete plate. The steel frame always use hot dip galvanized light steel. Roof beam adopts horizontal girder structure and using herringbone connection. The horizontal girder bears 2 or more roofs, which is made of aluminum alloy. This material is used as roof structure material and also glass inlay material. Other beams using gutter style to minimize the section. Delighting material of the roof and side wall using the hollow double-layer or multilayer PC board.
PC board is mainly made of PC/PET/PMMA/PP materials, it need sun screen coating to resist ultraviolet resist and ageing, and it is also required to be anti condensation and antidrug.
As a kind of light material, use PC board can greatly reduce the weight of greenhouse structure, and corresponding reduced the size of the steel frame, which saving the cost of steel.
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