At Cultilene we research, innovate and generate knowledge. We do this together with other Plant Empowerment community members, our parent company Saint-Gobain and research and educational institutions. This not only helps us to boost our own innovative strength but it also gives us the opportunity to help the horticultural sector as a whole progress. That’s why we make our knowledge as accessible and available to as many people as possible. Want to find out more?
The root system is the plant’s engine for growth and production. We developed the Cultilene Smart Root Zone Management Model to control the root system. Smart metering prevents setbacks in the plant’s development and ensures consistently high production. The model consists of three pillars: Cultilene Framework, Cultiwatch and our people.
Cultilene thrives on knowledge acquisition and innovation. We are more than happy to share our knowledge in our team and with our customers and partners – such as via white papers, concise reports on specific subjects.
The standard is a hole of 25 x 25 mm for a plug of 22 x 27 mm. To keep the base of the plant slightly higher and drier it is good to use a plug that is 2 mm longer than the hole in the cube. This helps to keep the base of the seedling dry and reduce the chance of infection.
The most commonly used cube hole sizes are 30 / 30 mm for the plugs put horizontal (90º). If the plug and plant are inverted (180º), use a hole in the cube 30 / 35 mm.
There are many hole sizes being used, but a 25 / 25 mm hole type works well. It is important that the seed is not too deep in the cube.
This depends on the season.
In Northern Europe and comparable climates it is best to water before midday. If needed, water between 12 am and 3 pm. In hotter climates it will be necessary to adjust your strategy of watering. The objective is always that the plant uses the water on the same day of watering. Watering too close to sunset can cause the plant to stretch.
After the initial saturation it is best to water from below with an ebb and flood system. This is because it is possible to give a higher EC which does not get onto the leaves. Overhead watering or misting can also be used to maintain humidity.
Yes it is. The main goal is to stay in a safe range. If you go too low, you will face problems in growth and risk damaging the roots. When you go too high some nutrients will be harder to take up by the plant. Keep the pH above 5.2.
Tomato – RootmaXX
RootmaXX is a drier cube than the standard Pc cube and it also has a lower EC. This makes the cube more reactive. Root distribution is better throughout the whole of the cube because of the X-fibre technology.
Pepper – Plantcomfort (Pc)
Pc is the standard cube with optimal water content for root growth. It is not too wet or too dry for peppers. It has an excellent water content of around 45% on the slab during the growing period. If you want steer more generative, choose Qr. It is a drier cube than Pc on the slab.
Cucumber – Plantcomfort (Pc) and RootmaXX
For cucumbers we recommend Pc and RootmaXX both cubes are excellent to use.
The positioning of the drainage slits in combination with the right irrigation dose size influences directly the distribution of water and EC in the slab to produce the minimum variation of water content and EC laterally and vertically in the slab. This is a job that has to be done only once but will influence the slab for the rest of the season, so it is very important that it is done correctly.
Additional drainage slits should never be made in the slab at a later date as they will change the drainage pattern in the slab which may be detrimental to the roots in some areas of the slab.
Ideally there should be the same number of drippers in every cube with no extra drippers put directly into the slab.
Additional tips for making the drainage slits:
In the Season Dynamics (Smart Root Zone Management App) we state that it is important to have a target EC for each of the different periods during the crop.
To control the EC to the target levels it is important to use the proper measuring strategy so that you can make small and frequent changes to your irrigation strategy. It is always easier and safer to make frequent small changes than to make big changes when the EC has got too high.
The important factors for good EC control are:
Period 1 in the Daily Dynamics is very important to re-fill the slabs as evenly as possible with the correct dose size. This will not only give better EC control later in the day but also reduce the variation in EC around the glasshouse.
To reduce EC it is necessary to flush the slab more. This can be done by:
Other points of attention:
Mistakes happen and sometimes the slab can dry out with insufficient water especially the top of the slab.
To re-wet the slab it is best to use small and frequent waterings. This will help keep the water you apply in the slab and at the top. Large dose will push the water to the bottom of the slab and quicker to the drain point.
So it is important to use a dose size factor of 20 or lower if possible within the limitations of your system.
It is also important that you apply more water than the plant is using, so watering at night or before plant activity in the morning is a good time for this but take care of the Delta EC to avoid problems with fruit splitting (tomatoes) etc.
The intensity of light is measured in watts/m2. This is an instant reading of the brightness of light at the moment of measurement.
The light sum is measured in joules/cm2. This is the total amount of light received over the period. So over a period of one hour the total amount of light received in joules/cm2 will depend on the intensity of the light during this period.
Light triggered irrigation starts
In glasshouses plant water use is measured per m2. A general figure used in Northern European conditions is 2.5 to 3.0 mls per joule per square meter as a setting for the computer with a target figure of 3 mls per joule for the total on a bright day.This is based on a full crop canopy.
Plants use more water per joule of light at low light intensities which is why it is important to have an irrigation trigger on time and not just light.
The best day of the year would be about 3,000 joules.
The highest light intensity in Northern European conditions would be around 1,000 watts/m2.
For example with a calculated dose size of 100ml with 3 drippers per m2
In hotter countries especially where air humidity is low (or HD is high) the cc per joule requirement can be 4 or higher. This would mean that the time between irrigations would need to be less.
This is why the volume of the substrate per m2 and its relation to the dose size and the necessary frequency of the subsequent irrigations during the brightest part of the day need to be match to the limitations of the nursery irrigation system.
The spacing of the dippers has a big effect on the even distribution of water and nutrients in the slab. The flow of this water is spread evenly by the stone wool to refresh the nutrient solution around the roots. This is what we call the Cone. The Cone starts in the cube and spreads down and sideways.
The cube will increase the width of the cone and the volume refreshed by the dripper giving more efficient water and fertilizer use. This is vital to give good refreshment and even water content, EC control and minimizing drain.
When changing plant density or crop there can be more drippers than cubes to put them in. In this case:
The optimal dose size for our slabs can be calculated using the Dose size Calculator or manually as below.
Slab with volume = 100 x 15 x 7.5 cm = 11.25 liter
3 cubes volume = 3 x (10 x 10 x 6.5 cm) = 3 x 0.65 liter = 1.95 liter
Total stone wool volume = 13.2 liter
This is the total volume of substrate (cube and slab) supplied per dripper multiplied by the DSF (Dose Size Factor). So the larger the volume of substrate per dripper the larger the dose size.