In previous years, with the increase in temperature and humidity in greenhouses, many pests and diseases began to spread, and growers had to take measures such as pesticide spraying to prevent them. However, in the Liuchunyuan picking base in the Gaoqing County Economic Development Zone, Zibo City, Shandong Province, no pesticide was sprayed by the growers. Instead, smoke was used to prevent and remove the disease. According to Zhao Shuhong, the person in charge of the base, this is her own invention of the Houttuynia pest control technology.
“Our tomato fruit is large and its leaf surface is clean and free of pests. It is inseparable from the method of killing Houttuynia that I created.†Zhao Shuhong said that tomatoes are most afraid of downy mildew and late blight. After the hot weather or heavy rain, tomatoes have a high incidence of this disease. Moreover, these diseases can only be prevented in advance, and the effect of remedy after illness is often poor.
"The use of Houttuynia extract to kill insects can effectively prevent and treat pests and diseases, but also to ensure the green ecology of tomatoes, and this method costs very little, basically 'zero cost'." Zhao Shuhong said that the insecticide benefit In a report in the newspaper, she saw from the newspaper that diluting Houttuynia sap juice on potted fruits and vegetables could prevent pests. So, she thought of using Houttuynia extract and sawdust to ignite and use the smoke to kill insects. The result was very good. The tomatoes grew well and were not bugs.
"A greenhouse with a length of about 70 meters requires only three small piles. Each extract of Houttuynia cordata with less than 2 or 2 piles can play a role in insecticidal and sterilizing, and it can last for a long time. Once a week, it can be smoked once. According to Zhao Shuhong, pests and diseases are different at different growth stages, but they can all be prevented by the use of Houttuynia mixed with sawdust to ignite smoke.
"Pests and melons cannot be avoided, but pesticides can be used to fight diseases for more than three days. It is not only impossible to eradicate diseases, but also to produce pesticide residues and endanger people's health. With this method, we don't need much cost, and pests and diseases can be obtained. Effective prevention, there will be no residue on the surface of vegetables, but also to sell high prices, it really is more than one.†Speaking of their own ecological pest control method, Zhao Shuhong is very proud.
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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