Stal Impex Sp. z o. o.
ul. Łukasiewicza 49
38-400 Krosno
tel: +48 885 204 200
tel: +48 885 204 201
e-mail: krosagro@krosagro.com
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Growing raspberries in a foil tunnel

Growing raspberries in a foil tunnel is a good way to harvest healthy and sweet fruits. Horticultural greenhouses provide the plant with adequate humidity, temperature and protection from strong winds and intense rainfall. Poland is a giant in the cultivation of raspberries, and in many gardens, plots and plantations, we can spot bushes that produce tasty fruits of considerable commercial value.


In order to plant raspberries in the garden tunnel, we first select seedling. Seedlings should be decontaminated, free of pathogens, with a dewy root system and no signs of drying. The preferred choice for growers are long cane raspberries, with proper care to guarantee a plentiful yield. On the market, there is a considerable amount of varieties, below we will mention the most common ones:

LASZKA - full and very large fruits ripening at the turn of June and July.

SOKOLICA - slightly elongated fruit with cone form, ripening in late June.

RADZIEJOWA - tasty fruits with conical shape ripening until mid June.

TULAMEEN - bright red fruit, strongly elongated. The variety belongs to early groups, so first crop depends on care and protection from frost.

GLEN AMPLE - spherical, elongated fruit with long harvesting time, with a medium ripening variety.

TADMOR - very large fruit of intense color, sweet sour taste. Variety maturing late and resistant to moth.

BENEFIS - resistant to disease, transport and storage, maturing late.

POLKA - large shiny red fruit with conical shape, maturing in early August.

POLONEZ - medium-sized fruits, ripening in the second half of August.

Horticultural tunnels prolong the harvest, increase yield and protect against insects that could damage the raspberries. A protection from weather effects and adequate sunlight will provide the optimum conditions for growth and fruiting.

 

Methods of cultivation in horticultural tents


Plants or seedlings can be sowed directly into the ground, arranged in rows so that they do not hinder each other for sun exposure . With 30 to 60 cm between them, it will be easier for later care and harvest. Irrigation is as necessary as with any plant . As well as reducing the costs generated by irrigation, fertigation supplies optimum dose of fertilizers directly to the roots,  with water. This contributes to better absorption of nutrients and no wash out from the soil. Shrubs require continuous access to water, especially during flowering until fruiting. Traditional watering is applied each time the soil is dry, neglect can lead to drought stress and disease development. The lack of water also leads to growth delay and deterioration of taste.

 

Mulching the soil or covering it with agro textile will slow the weed growth process, retain moisture of the substrate, and store the heat that will protect the plant from temperature fluctuations.

 

Growing raspberries under the cover gives fruits much faster than in field crops, yields also surpass the open-air culture. As the bushes bend upwards and their root system is shallow, a support for the stems should be used. We keep the strong shoots at the center of the plant while the weak ones are removed not to strain the shrubs.

 

Seedlings in a greenhouse


The use of strong and high quality seedlings is a prerequisite for a success in growing raspberries under cover. Picked from a nursery in the late fall and stored in a cold store, they can enter the tunnel in spring. A good seedling means propagation of shrubs with high disease resistance and high fruit yield.
In the case of a small plantation, after 3 years we can notice that the quality of fruit fall significantly, and the plants themselves begin to show more signs of disease.



Trimming and cutting raspberries


Correct cutting of raspberries is very important for their development, proper trimming means better harvest . We cut the plant immediately after harvest, low shoots are cut and waste is disposed outside the foil tunnel. If we leave untreated raspberry bushes, they may develop fungi on them, and deadly mold.

 

We also cut the bushes to balance the high density of green mass, we remove some of the annual shoots every year. We leave 5 to 8 branches which will be supporting the plant.

 

For varieties repeating fruiting in autumn, cut in late autumn or spring.

 

Raspberry care in a foil tunnel


Raspberries like other plants are exposed to pathogens and pests. They cause loss of yield and can contribute to plant weakening and sometimes to their complete disappearance. Effective crop protection implies a careful observation that no pathogens or pests appear on plants. Shrubs should be monitored constantly as the insect maturation process takes a short while, and their expansion takes place within a few hours under appropriate conditions. We apply spray on dying shoots during growth and after harvest. In order to protect the plant against pests, we use adapted substances , spraying the bush during flowering time.

 

Harvest of raspberries in the garden tunnel


We pick the fruits when they are ripe and easily separate from the flower bottom. To keep the raspberries longer, we choose dried fruit, because in comparison, moisture slowly leads to rot. They are very unstable to storage and freezing is best for long storage time.

 

The harvesting time can be extended using several varieties, with different stages of ripening. Early and late plants give longer production time than with one type of raspberries. Harvesting in polytunnels is not dependent on the weather like field crops, it makes it easier and sometimes even allows to sell them to retail, processing and purchasing markets.

 

Ripe raspberry in the tunnel


Repeated fruiting in raspberries produces more yield for crops under cover than in open crops. Increased yield potential, higher quality harvest. A fruitful and more productive harvest also means a higher share of commercial yield in the overall crop.

 

 
 
 

Stal Impex Sp. z o. o. · ul. Łukasiewicza 49 · 38-400 Krosno · tel: +48 885 204 200, +48 885 204 201 · e-mail: krosagro@krosagro.com · 
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