Summer is hot and rainy, it is difficult to grow spinach, but the market sells well and the income is considerable. Use greenhouses or greenhouses in the summer to be idle and plant them in a rain-proof way. A month or more can be harvested. The main cultivation techniques are as follows:
First, the rain sun shade pest control. Covering the shed film with a sunscreen with a light transmittance of 50%, or applying mud to the shed film, can significantly reduce the temperature inside the shed. The area around the shed was raised to a height of 1 meter and a pest net of 60-70 mesh was enclosed to block insects from entering the shed.
Second, use heat-resistant varieties. In general, the winners produced by K4, K5, K6, K7 and Novartis produced by the Dutch "Bujiu" company are generally able to withstand the high temperature of 34°C. The sowing time is from May to September.
Third, ridge cultivation. Spinach cultivation in summer is most afraid of moisture, easy to get stalk rot, ridge cultivation can keep the base of the leaves well ventilated, not easy to get sick. Generally 50 cm from a ridge, two rows per ridge, 5 cm point a hole, two points per hole, about 1 kg per acre species.
Fourth, fertilizer and water use. Spinach likes fertile, moist, slightly alkaline, humus high soil content, so to re-apply organic fertilizer, usually with 1,000 kg of chicken manure per acre, boron and magnesium fertilizer 2 kg per acre, top dressing is best to use potassium nitrate, each The next 15 kilograms, should pay attention to dry watering when watering, planing after pouring, to prevent the ground from growing moss.
Fifth, pest control. Summer spinach is easy to get stalk rot, anthrax, azoxystrobin, carbendazim, thiophanate-methyl equivalent spray once, to prevent in advance. To prevent the virus disease, we need to take care of the shade, cool down and prevent rain, prevent excessive drought, increase organic fertilizer, potash fertilizer, and trace element fertilizer every 7 days. If spotted lees, aphids, aphids, etc., can be controlled with avermectin, imidacloprid, or pymetrozine.
Six, timely harvest. When the spinach grows to 20-30 cm in height, it must be harvested in time. Due to the high temperatures in the summer, spinach is not tolerant to high temperatures and the harvest will be early and late.
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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