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Do Polytunnels Need Ventilation?

Do Polytunnels Need Ventilation

The question of ventilation is important for polytunnels, as the temperatures inside can often drop below freezing. This can be problematic for young plants, but there are tried and tested techniques that can help keep your young plants warm. One way is by letting light from the Sun shine through the glass roof. This heats up the plants and the ground within the polytunnel. Infrared radiation from the Sun is absorbed by the glass roof, trapping this heat within the greenhouse.

Side ventilation

The right ventilation is essential for a polytunnel. Proper ventilation allows plants to breathe. It also helps to reduce the risk of disease, since diseases are easier to spread in areas where temperatures are warm or humid. Inadequate ventilation can also encourage moulds and mildews to grow, which are a serious health risk.

Side ventilation in polytunnels can be achieved by using timber or aluminium side rails, which are fixed to the polytunnel’s sides with aluminium gutters. These systems are fitted with 50% shade ventilation netting which can be trenched or affixed to the base rail. The type of side ventilation you choose will depend on the way the polytunnel is constructed.

Circulation fans

Circulation fans for polytunnel gardening will help to maintain a comfortable temperature inside the greenhouse. These ventilation units have auto inlet louvres that provide good air circulation. Walk-through ventilation systems are also available, and are installed on vertically sided polytunnels. They operate via a simple pull-cord.

Proper ventilation is crucial to the survival of plants. Fresh air movement helps them to perform photosynthesis, absorbing water and carbon dioxide from the air. Ventilation fans move substantial amounts of air with low pressure and low energy consumption. They are easy to install, and easy to use. Some models are fitted with a temperature switch and control panel, making them ideal for polytunnel ventilation.

Shade nets

Shade nets provide a number of benefits, including protection from pests and diseases. These pests and diseases can destroy your crops, but shade nets can help prevent these problems. They also protect plants from different atmospheric elements, including storms, insects, crows, and livestock.

Shade nets can be used internally or externally to protect your polytunnel from harsh sunlight. They are usually made from plastic weave and are secured to the frame by clips. They are highly durable and will not tear or wear out in inclement weather. If you don’t want to invest in external netting, you can also use hessian.

Avoiding friction between the plastic cover and plants

When moving your polytunnel, it is important to take into consideration the plant life surrounding it. Even the slightest amount of friction will damage your plants. Make sure the vegetation is not too close to the polytunnel and trim it back to avoid damaging the plants. Also, repair any damage immediately.

Plants are especially sensitive to friction. This can lead to disease and pest damage, and can also cause premature plant death. However, the good news is that plants grown in polytunnels should be healthy and grow faster than those grown outside. They should also be more resistant to bad weather, including rain. And they should be better able to withstand pests and diseases than those grown in conventional greenhouses.

Temperature control in a polytunnel

Temperature control in a polytunner is crucial for the health and growth of your plants. The ideal temperature for most plants in a polytunnel is around 26-30 degrees Celsius, although temperatures can rise well above this on hot sunny days. Too much heat can slow down germination, cause diseases and pests to attack your plants, and can damage their photosynthesis. Overheating can even kill your plants.

You can use ventilation in your polytunnel to reduce the temperature. Ideally, your polytunnel should have one or more doors for ventilation. Double doors or a wider sliding door will maximise air circulation through the polytunnel. Another option is to plant plants in a way that creates shading.

Cost of ventilation

There are a number of different types of ventilation systems for polytunnels. These systems can include side or top ventilation. Side ventilation systems use aluminium or timber rails to provide extra ventilation. They can also be automated or linked to an environmental control system. Side ventilation is necessary for optimum growing conditions.

Polytunnels are used to grow vegetables and soft fruit in temperate climates. They are similar to greenhouses and cloches, but they can be used for more than just growing vegetables. Some modern polytunnels are even designed with harvesting and sowing machines. This has revolutionized the way people grow strawberries and other soft fruits in the UK. They also use foggers to keep the temperature at a moderate level.