Before determining the space between greenhouses, it is still necessary to carry out relevant popular science knowledge in the greenhouse industry. This is very necessary for ordinary users. The term "greenhouse" is just a colloquial expression in daily life. There is no such type in the greenhouse industry, but in the greenhouse industry, it is generally divided into three categories by name, namely spring and autumn greenhouses, solar greenhouses and multi span greenhouses.
▲ Spacing between solar greenhouses of different greenhouse types
In the practical application of greenhouse, the space between greenhouses is mainly considered whether there is shelter, which affects the lighting of crops in the greenhouse. In fact, there are three different types of greenhouses, which have a large gap in terms of light shielding. Spring and autumn greenhouses and multi span greenhouses have a common feature, that is, they are all made of transparent covering materials, which is relatively low for the sunlight shielding of the front and rear greenhouses. The solar greenhouse is different. Its biggest feature is that it has a wall, which can be said to be 100% sunshade. During the construction of the solar greenhouse, the distance blocked by the back wall directly affects the position of the greenhouse behind.
▲ The space between greenhouses in spring and autumn is very small
① Spring and autumn greenhouses and multi span greenhouses also need a certain distance directly
For the covering materials of these two greenhouses, although they are transparent. From the perspective of light transmission, the influence of sunlight on plant growth can be ignored. However, there must be a distance between greenhouses, which is mainly related to the practical application of greenhouses, especially when the length of greenhouses is relatively long. For the materials that need to be transported for planting crops in greenhouses, there should be a corridor that is wide enough directly in the two greenhouses to facilitate vehicle access. Another point is the maintenance of greenhouses, especially multi span greenhouses. If the covering materials are damaged, large equipment will be required for hoisting operations, and a maintenance channel will be required, which is basically more than 4 meters away.
▲ Actual construction spacing of solar greenhouse
② The spacing between solar greenhouses must be considered
The solar greenhouse itself is a special greenhouse, and its distribution area is also in the north, which can also be understood as a unique greenhouse type in the north. As for this reason, it has a wall structure, and this wall structure has different forms, but this is not the theme today. As for the influence of the spacing between greenhouses, the main problem of sunlight shielding on the walls of solar greenhouses will affect the construction of the greenhouses behind, that is, to ensure that there is an appropriate distance between greenhouses. In this way, the lighting time of the crops in the greenhouse will not be affected, otherwise, the normal growth of the crops will be affected.
Summary: Next, we will give full consideration to the space between
Solar Greenhouse Construction, which has a great impact on crop growth due to greenhouse shielding. How to solve this problem? What's more, the factors involved are convenient, not just the wall height.
Influence of Regional Factors on Solar Greenhouse Construction
For solar greenhouse construction areas, it is also easy to understand this point. In order to make a simple analysis here, it mainly refers to the local conditions of construction, such as hilly areas and plain areas. When building greenhouses, their spacing is very different. In addition, in greenhouse construction, it is necessary to make full use of land and build the principle of waste of land resources. If the hilly area is built in the Chaoyang area, it is all ladder type, and the greenhouse is definitely the smallest indirectly. The plain area is different. It must take into account a dimension. Moreover, solar greenhouses are mainly used in winter. It is necessary to take into account the winter solstice, when the shadow length of the sun is the longest.
Consideration of light time required for planting crops
On the use time of solar greenhouse, you netizens also basically understand. It is mainly to solve the problem of off-season vegetable planting in winter. Because of its good heat preservation, vegetable farmers like to call it the greenhouse. Another problem that has to be considered here is the lighting time. This light time is not only the need for photosynthesis for crop growth, but also the time for solar greenhouse to store heat during the day. Different crops have different needs for lighting time. For example, cucumber, tomato, pepper and other crops require more than 6 hours of light. In addition, there are some low light crops, such as celery, rape, Chinese cabbage, which need 4 hours of light to ensure their normal production.
▲ Actual environment of soil wall greenhouse
How to calculate the distance between solar greenhouse construction
It is true that there is a scientific calculation formula for this, but it is mainly used in plain areas. For hills or slopes, special consideration is required, because there will be a problem of height of drop, and the construction spacing between them is generally small. This time, we mainly focus on the design between solar greenhouses. At least we should ensure that the greenhouse has a lot of 6 hours of light time, which can ensure the planting of various types of plants. It is also consistent with the recycling of multiple crops in the greenhouse, and more consistent with the ecological development of the greenhouse. You can refer to the indirect calculation form suitable for the greenhouse construction planning in the surrounding areas of Hebei.
① Basic conditions for the construction of solar greenhouse
Here we need to provide the basic conditions for the design of the solar greenhouse. The back wall height of the solar greenhouse is 2.8m, the ridge height is 3.5m, and the projection distance of the back slope is 1.2m. The wall thickness depends on whether it is a brick wall or a soil wall. The brick wall is generally 0.24m, and the soil wall is generally 0.5-1m. A fixed value is required here. Take the brick wall as an example, select 0.24m.
② Calculation of Space between Solar Greenhouses
Before the calculation, we need to check the local dimension. The requirement is to guarantee a minimum of 6 hours of light time. The dimension is 40 degrees, which is generally a north-south construction. That is, from 9:30 a.m. to 10:00 a.m., there must be sunshine in the front room of the greenhouse. For this sunshine spacing coefficient, L0, is 2.993 meters, this data can be queried.
In this calculation process, it is necessary to know the slope of the roof of a solar greenhouse. There is also a fixed calculation formula that can be used to calculate this, and it is very simple when there are data. The formula is as follows:
β = Tg-1 [(ridge height back wall eave height)/(back slope projection width+back wall thickness)]
=tg-1[ ( 3.50- 2.80) / ( 1.20+0.24)]
= 20.2°
The formula for calculating the distance between solar greenhouses is:
Greenhouse indirect=L0 × Ridge height - (projection width of back slope+thickness of back wall), 2.993 × 3.5 - (1.2+0.24)=9.04m.
