Paul Jeannet, farm manager of the UrbanFarmers rooftop greenhouse in The Hague, has used the Qlipr system for three months in four different crops: ‘It’s very easy to use, once you get used to it. It allows us to save time and - this is the biggest advantage in my opinion - we can reuse the clips after every crop cycle. We can easily separate the clips from the plants and compost the plants, because there are no strings or plastic clips left in it. Nothing is wasted.’
The Qlipr system fits right into the UrbanFarmers philosophy, which is based on creating added value and minimizing waste. At the UF002 farm in The Hague, consisting of a greenhouse with a surface area of 1,000 m2 on top of a former office building and a Tilapia fish farm, that philosophy has been taken into practice. The waste water of the fish tanks is turned into nutrients for the plants in the greenhouse. In the greenhouse, different varieties of lettuce, tomatoes, cucumbers, sweet peppers and aubergines grow in a hydroponic system. The water that is not used by the plants is purified and pumped back to the fish farm, which reduces overall water usage by 80%. Pesticides are forbidden; only biological plant protection methods are allowed. The products are sold to customers in the region, to minimise food miles. ‘We grow fresher, tastier and healthier products, as close to our customers as possible. And we minimise waste,’ Paul Jeannet explains.
The fresh revolution
Paul Jeannet (24) started working for Urban Farmers one year ago, after an internship at UrbanFarmers’ first farm (UF001) in Basel. He studied biological agriculture in Switzerland, before he joined ‘the fresh revolution’. ‘At first we were only growing lettuce and tomatoes. When our gastronomy partners told us that they would prefer more diversity, we took out some of the tomatoes and put in cucumbers, aubergines and sweet peppers instead, and several different varieties of tomatoes. We kept the lettuce section.’
Six months ago Paul got in touch with Cor Pellikaan and became interested in the Qlipr system. ‘We wanted to give it a try to see if it would work in different crops. Three months ago we started using the system in tomatoes, cucumbers, sweet peppers and aubergines. As it turned out, the system is quite easy to use: we take the lower clip and place it on top and we lower the plant at the same time. It is quite different from the normal plastic clip we were using, but once you get used to it is very easy to use.’ The lowering schedule is once a week for tomatoes, three times every two weeks for cucumbers and once every two weeks for sweet peppers and aubergines.
Cor Pellikaan, the inventor of the Qlipr system, needed a pilot project to test his clips on sweet peppers and aubergines. Until three months ago, the system - which he invented in 1996 - was only used by growers of tomatoes and cucumbers worldwide. The system consists of a crop hook (1.40 meters long) and two clips. Halfway through the plants’ development, extra crop wires are needed with which to fix the crop hooks into place.
The main advantages of the system are, according to Pellikaan: ‘It’s very simple to use. Everybody can work with it. It will save labour, because you can de-leaf, remove shoots, prune and lower the plants in one go. This is also better for plant health, because there is less chance of damage.’ Paul Jeannet confirms that he saves up to six hours a week in the rooftop greenhouse because he uses the Qlipr system instead of regular plastic clips.
The main advantage of the Qlipr system is its durability, says Pellikaan. ‘My first client bought them 18 years ago and he is still using the same clips. Of course, you have to disinfect them at the end of every crop cycle, but that is very easy. You can use steam, chemicals or pasteurization. I recommend the latter, after two years of thoroughly testing this method. Just put the clips in a box on a trolley and cover it up with a canvas. Heat up four pipes to 60°C under it for three days. Works perfectly.’Paul says this is a big advantage too, but there is more. Thanks to the Qlipr system neither plastic string nor clips are left on the plants after each crop cycle. ‘So we don’t have to throw away our plants, but we can shred them for composting. It also makes it much easier for us to get rid of the plant material, because we have to transport everything via the lift.’
Qlipr versus traditional clips
How many clips are needed to bear the weight of the plants? ‘At the start of the season one clip will suffice. You attach it at 40 cm below the head of the plant. When the plants get heavier you will need to add a second clip, Cor Pellikaan explains. A new item in the Qlipr product range is the double-stop crop hook of 1.40 meters with two stoppers: one at 50 cm and one at the bottom of the hook. This makes it possible to use the same hook for tomatoes as well as cucumbers.
The investment in the Qlipr system is higher than with traditional plastic clips, but they will last a lifetime, Cor says. ‘Also, you don’t need to buy expensive trolleys with hydraulic platforms, because the plant tips grow at a height of 160 cm. Therefore, cheap trolleys will suffice. In most cases this will save you enough money to buy Qlipr clips.’
Paul Jeannet has become a fan of the Qlipr system rather quickly: ‘Cutting leaves has become more enjoyable. We no longer have a plastic string or plastic clips at the bottom of the plant holding the leaves together. Only two clips at the head of the plant.’ Would he recommend this system to other growers? ‘Yes! It is a really interesting system to work with; you buy it once and then you can use it every year.’
Pellikaan thinks the Qlipr system will also benefit growers in the future. He is working on a mechanical system to pollinate crops without the use of bumblebees. It has been tested thoroughly and he expects to launch it this year. He is also working on a robot that can harvest and de-leaf tomatoes, which is still a prototype. That is still a bit of a secret, so we will stop asking here. It is clear that Cor Pellikaan is still coming up with new inventions for international horticulture to create simple solutions that work.