Why is it that long and narrow plots of land are not suitable for building greenhouse
Why is it that long and narrow plots of land are not suitable for building polytunnels?
The multi-span greenhouses include multi-span plastic greenhouses and multi-span glass greenhouses. When constructing multi-span greenhouses, the site is generally selected to be approximately square-shaped. However, some sites are not suitable for building multi-span greenhouses, such as elongated sites or those with excessively long lengths and widths.The elongated polytunnel has a narrow and long air circulation path that is prone to form a narrow wind channel. The ventilation is uneven, which may lead to excessive ventilation in some areas while insufficient ventilation in others, thereby affecting the stability of the growth environment for crops.
The orientation of the multi-span greenhouse is divided into span and bay. The span refers to the facade where the arched or pointed roof is located, while multi-span plastic greenhouse the bay refers to the facade where the drainage trough is located. For slender multi-span plastic greenhouses, such as a 120-meter by 12-meter site, if the length is in the span direction and the bay is too short, shading needs to be divided into many areas, and there will be many downspouts. If the length is in the bay direction and the span is too short, the drainage trough will be too long and prone to water accumulation.
The orientation of the multi-span greenhouse is divided into span and bay. The span refers to the facade where the arched or pointed roof is located, while the bay refers to the facade where the drainage trough is located. For slender multi-span greenhouses, such as a 120-meter by 12-meter site, if the length is in the span direction and the bay is too short, shading needs to be divided into many areas, and there will be many downspouts. If the length is in the bay direction and the span is too short, the drainage trough will be too long and prone to water accumulation.
Another issue is that the elongated polytunnel is prone to uneven light distribution. The elongated layout causes significant differences in light duration and intensity within the polytunnel at various positions. The edges and the middle parts receive inconsistent light exposure, which is not conducive to unified management of crops and overall good growth. The elongated polytunnel has a narrow and long air circulation path that is prone to form a narrow wind channel. The ventilation is uneven, which may lead to excessive ventilation in some areas while insufficient ventilation in others, thereby affecting the stability of the growth environment for crops.
