Soilless cultivation Commercial Venlo type multi span glass greenhouse

Introduction

1) High light transmittance and uniform illumination.

The roof of the Venlo glass greenhouse uses glass with high light transmittance as the lighting material, and uses special

aluminum profiles as the roof beams, which greatly reduces the cross-sectional size of the roof beams. In addition,

the roof purlins and connectors are omitted, which reduces the shading of the entire roof system and greatly improves the light transmittance of the entire greenhouse.

(2) The greenhouse has good sealing.

The Venlo glass greenhouse uses special aluminum alloys and matching rubber strips as glass inlay components,

which greatly improves the airtightness of the greenhouse. On the one hand, good airtightness ensures that the

heat loss caused by convection in the greenhouse is greatly reduced. On the other hand, it provides conditions

for good roof drainage. Therefore, the Venlo greenhouse often uses a very small gutter and the roof on both sides

of the gutter to form the roof drainage channel of the greenhouse, which greatly improves the roof drainage efficiency.

(3) Large ventilation area.

The roof of the Venlo glass greenhouse has a higher projection ratio relative to the ground. When using the

interval window opening method, the ventilation rate can be the same as other greenhouses with the same span.

When using continuous window opening, the ventilation rate is doubled. The ventilation area of ​​the Venlo glass greenhouse

can reach about 30% of the greenhouse floor area.

(4) High roof drainage efficiency.

Since the number of gutters in each span of the Venlo glass greenhouse is 2-4, the drainage area of ​​each gutter is

reduced by 50%-83% compared with other types of greenhouses with the same span.

(5) Strong flexibility in use.

The application of truss roof joists makes the Venlo glass greenhouse more flexible in use. Since the height of the

truss joists is 200-400 mm, it provides sufficient installation space and support positions for the installation of the

opening mechanism, curtain system, crop hanging system and some other equipment.

(6) Strong versatility of components.

Due to the consistency of the roof unit of the Venlo glass greenhouse and the similarity of the node structure,

it provides the greatest possibility for the standardization of components, thereby reducing the large changes and

large number of components caused by different greenhouse spans. On the one hand, it reduces the cost of

greenhouse production and management costs, and also provides greater convenience for product after-sales service and maintenance.

(7) The greenhouse height is low and has strong load-bearing capacity.

Due to the reduction of the roof height, the overall height of the greenhouse is reduced accordingly without

affecting the height of the indoor space of the greenhouse. The size of the wind load borne by the main structure

of the greenhouse is directly related to the height of the greenhouse. Reducing the height of the greenhouse is

actually equivalent to reducing the wind load borne by the greenhouse.

Advantages of soilless cultivation:

1. High yield, high quality and early maturity
By precisely controlling the composition of nutrient solution and environmental conditions, crops grow faster and have higher yields.

2. Save water resources and fertilizers
Using a circulating irrigation system, the water utilization rate is 75% to 90% higher than that of soil cultivation, and the fertilizer utilization

rate is more than 90%, which greatly reduces waste.

3. Break through geographical restrictions
It can be planted in areas where traditional agriculture cannot be carried out, such as deserts, saline-alkali land, roofs, balconies, etc.,

to expand agricultural production space.

4. Cleanliness and food safety
Avoid soil bacteria and heavy metal pollution, reduce the use of pesticides, and produce safer green food.

5. Automation and labor efficiency improvement
No need for traditional farming operations such as ploughing and weeding, convenient management, and reduced labor intensity.
It can achieve mechanized and automated control and promote the development of agricultural industrialization.

In addition, soilless cultivation can also avoid soil continuous cropping obstacles and solve the problem of repeated cropping and reduced yield. These advantages make it an important technical direction for the transformation of modern agriculture.