(1) Ventilation in the sheds should be timely and appropriate. The temperature difference between the inside and outside of the shed should be large. Do not suddenly let out the wind to prevent the cucumbers from being tolerated.
(2) Adopt the formula fertilization technology and apply compost or decomposed new organic fertilizer made by Japanese enzyme bacteria to reduce the amount of chemical fertilizers. In particular, timely and appropriate amount of fertilizer should be applied. Attention should be paid to the application of fertilizer such as ammonium sulfate and other accessory residual soils to facilitate the soil. The concentration of the solution is moderate and it is advisable to apply full-yuan fertilizer.
(3) Soils with high salinity, sometimes with white salts, should be washed with salt and soaked in water. If necessary, they should be flooded for 15 to 20 days in the summer to make the salt in the soil leach into the soil. Deep layers reduce the salt content of the tillage layer.
(4) The soil with high salt content in the surface layer can be solved by the deep-turning method, and the conditions can also be changed.
(5) When using insecticides and bactericides, scientific and rational drug use should be done. The concentration should not be increased easily. The leaves can be moistened without dripping. Use small-diameter jets as much as possible to facilitate even spraying.
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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JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , http://www.spgreenhouse.com