Which kind of greenhouse is cost-effective

First, the type of vegetable greenhouses and construction costs

Simple bamboo frame greenhouse

A widely used type, shed type generally 5 to 6 meters wide, top height of 2 to 3.2 meters, side height of 1 to 1.2 meters, arch spacing 1 to 1.1 meters. Easy to draw, easy to build, low cost, cost about 3,000 yuan per mu (with thin film).

Note: There are many pillars in the greenhouse, high shading rate, inconvenient operation, and short service life.

6m wide fabricated steel frame greenhouse

This type of shed has been used for many years, mainly in the diameter of 22 mm, 1.2 mm thick galvanized steel pipe for the greenhouse frame material, shed width of 6 meters, the top height of 2.2 to 2.5 meters, shoulder height of 1.2 meters, land utilization 80 %, the service life is more than 10 years, the cost per square meter is 10 to 30 yuan, and the construction cost per mu is 7,000 to 20,000 yuan.

Note: This type of shed is suitable for growing vegetables and flowers. The disadvantage is that the shed is small, the operation and management efficiency is low, and the winter insulation is weak.

8 meters wide type steel frame greenhouse

This greenhouse is constructed of galvanized pipes 28 to 32 mm in diameter and 1.5 mm thick; the roof height is 3.2 to 3.5 meters, the shoulder height is 1.8 meters, and the space in the shed is large.

Note: The construction cost of such greenhouses has been greatly increased, with a cost of about 20 to 45 yuan per square meter, and a cost of 1.5 to 30 thousand yuan per mu, which is mainly suitable for agricultural demonstration parks and farms with certain economic strength.

Steel bamboo mixed greenhouse

The shed type structure is the same as a simple bamboo frame shed. The space is made of steel pipe and bamboo truss as the arch rod, which has the advantages of saving steel materials, lowering the cost, and being convenient to operate. It has a certain application area; the performance and cost are between steel sheds and bamboo sheds. between.

Multi-story shed

Linked sheds are an upgrade of ordinary sheds. They have the advantages of large space and high land use efficiency. The cost per square metre is 50 to 100 yuan.

Second, vegetables greenhouses cover materials introduced

General film

Polyethylene or polyvinyl chloride as raw material, film thickness 0.1 mm, colorless and transparent; service life is about six months.

Multifunctional longevity film

With a width of 7.5 meters and a thickness of 0.06 millimeters, the service life is 1 times longer than the common film, and the temperature at night is 1~2[deg.] C. higher than other materials; the film is not easy to form water droplets, the coverage effect is good, the cost is low, and the efficiency is high.

Grass fan

It is made of straw and has good insulation properties. It is a nighttime insulation material.

Polyethylene high foaming film

White multi-bubble plastic film, 1 meter wide, 0.4 to 0.5 centimeters thick, light weight, warm and similar to the grass.

Non-woven fabric

A polyester filament, a fabric that is not weaved. Divided into black and white, and have different density and thickness, in addition to insulation can also be used for shade net.

Shade net

A plastic woven wire mesh, commonly used black and silver gray two, and there are several kinds of density specifications, different shade ratio. Mainly used for summer sun protection against rain, but also for winter insulation coverage.

glass

There are three kinds of flat glass, tempered glass and plexiglass. Flat glass has good optical performance and mechanical properties, and tempered glass has high tensile strength.

III. Analysis of planting cost and profit

Greenhouse vegetable growing costs and profits are mainly determined by the construction and maintenance of greenhouses, and the agricultural resources required for vegetable planting and management. The situation varies from place to place.

In general, the vegetable greenhouse framework needs about 5,500 yuan per mu. In order to save the cost and extend the use of greenhouses, a more economical way to build greenhouses is to use semi-circular bamboos, iron wire, cement columns, and plastic paper. . Such a greenhouse can be used for 5 years. It only needs to replace plastic paper every year. Per mu of vegetable seedlings, pesticides, fertilizers and other costs about 700 yuan / year, land rental fee is 800 yuan per year.

Combined with the above calculations, the greenhouse vegetable planting cost is about 7,000 yuan per mu for the initial period, and the vegetable greenhouse is calculated for the five-year use period. The average cost per year for each mu is about 2,500 yuan.

Greenhouse vegetable cultivation profits can reach 150 to 250%, each year can be 2 to 3 seasons of vegetables, if it is planted vegetables, 1 to 2 seasons of vegetables can basically recover the initial construction and greenhouse vegetable management costs, so the first Profits can be realized in a year, with an average profit of 100 to 150%. The annual cost in subsequent years is to change some plastic paper.

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The automatic biochemical analyzer is an instrument that measures a specific chemical composition in body fluids according to the principle of photoelectric colorimetry. Due to its fast measurement speed, high accuracy and small consumption of reagents, it has been widely used in hospitals, epidemic prevention stations and family planning service stations at all levels. The combined use can greatly improve the efficiency and benefits of routine biochemical testing.
principle
The automatic analyzer is to automatically run all or part of the steps of sampling, mixing, warm bath (37°C) detection, result calculation, judgment, display and printing results and cleaning in the original manual operation process. Today, biochemical tests are basically automated analysis, and there are fully automatic biochemical analysis systems designed for large or very large clinical laboratories and commercial laboratories, which can be arbitrarily configured according to the laboratory's testing volume.
Whether it is the fastest-running (9600Test/h) modular fully automatic biochemical analyzer today, or the original manual-operated photoelectric colorimeter for colorimetry, the principle is the use of absorption spectroscopy in spectroscopic technology. It is the most basic core of the biochemical instrument.
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