Kwekerij Duijn-Hove B.V.

The company Kwekerij Duijn-Hove was founded in 1997 by Mr. W. van Duijn (Ful). Previously the company was called Van Duijn Potplanten. In the 60’s, the company was founded by A. van Duijn, Ful’s father. In the early years, various types of vegetables were grown. The switch to pot plant cultivation took place in the mid 80’s. The company currently consists of two locations, a location in Maasland (2.5 ha) and a location in Maasdijk (3 ha) and is run by the 3 sons Hugo, Alex and Guido.

 

In Maasland various green plants are grown. These green plants are imported from Guatemala, Costa Rica, Thailand and China. The main crop at this location is Beaucarnea. In addition to the green plants, there is also a cultivation of Cambria’s (pot orchids). The location in Maasdijk cultivates Phalaenopsis (pot orchids).

Sustainability

Water
All rainwater falling on the roof of the greenhouse and commercial buildings is collected in a water basin. This water is used to water the plants. This is fully computer controlled. This way, the plants can get the water they need which is already provided with the optimal amount of fertilizers. So there is little waste. The water that is not absorbed by the plants is collected in a water silo. 85% of this water is reused after disinfection. The fertilizers (nutrients) are also reused. The remaining 15% drain water is discharged into the sewerage system, where the water purification company can treat it. No waste water is being discharged into the surface water.

 

Biodiversity
To produce the plants, we mainly use a lot of organic crop protection agents. Only if there is no other way, we will use some non-natural pesticides. Over the past 5 years, the use of organic resources has increased significantly and the use of non-natural resources has decreased dramatically. We have invested a lot of time in research into ways to deal with diseases and pests in a organic way. Unfortunately, it is currently not yet possible to do everything organically.

Green plants are produced all over the world. Kwekerij Duijn-Hove tries to teach its foreign suppliers which crop protection products they are allowed to use under European/Dutch legislation and which they are not allowed to use. Many plants imported by Duijn-Hove are over 15 years old. It could therefore happen that in the past, agents have been used which are no longer permitted. Efforts are being made to rule out this practice for the longer term.

 

Climate
Concerning energy consumption and emission of gases regarding air pollution

The location in Maasland is 100% connected to residual heat from the neighbour’s nursery. This heat comes from his cogeneration plant. The neighbour uses the heat only partly for his own greenhouse, but he has a surplus of heat. Normally he would destroy this surplus heat but instead he now delivers it to Duijn-Hove. This is a sustainable cooperation.

 

Several sources of energy are used at the location in Maasdijk. Here we use our own cogeneration plant. Electricity is produced for the required lighting and the residual heat is used to heat the greenhouse. In addition to the cogeneration plant, we also use a heat pump to cool the plant cultivation areas, in combination with underground hot and cold sources. Through these sources and heat pumps it is possible to collect and store the cold in the winter, that can be used for cooling in the summer. In the summer, heat is collected and stored to be used in the winter to heat the greenhouses.

This sustainable way of using energy will greatly reduce the use of fossil fuels. To cope with some extreme peaks, there is the possibility to use the gas boiler. Use of this boiler is kept to a minimum.

In order for the plants to grow well, they need CO2. At both locations there is an OCAP connection (organic CO2 for assimilation by plants) for the supply of CO2. This connection ensures that the CO2 from another industry that normally would end up in the atmosphere, is now supplied via a piping system to Duijn-Hove. Duijn-Hove uses this CO2 to grow the plants.  This approach makes a significant contribution to reducing the climate problem.

 And of course all waste is separated. Carton, plastic, soil residues, green waste and residual waste are all separated from each other. Here too, Duijn-Hove contributes to the environment.

Crop Protection Agents Kg Active Ingredient: 

Provides insight into the use of plant protection products. Red stands for substances with a high environmental impact, orange for substances with a low impact on the environment, green for substances with a low impact on the environment (Source MPS-A).

Energy (GJ):

Provides insight into the use of the amount of energy. (Source MPS-A)

Fertilizers (KG) Nitrogen and Phosphorus Consumption:

Provides insight into the use of Nitrogen and Phosphorus. (Source MPS-A)

People

Duijn-Hove permanently employs approximately 25 people in both locations.

In the high season there are also 30-40 temporary agency workers working in the company. Duijn-Hove applies the regulations described in the Collective Labour Agreement for glasshouse horticulture. This means that all employees have an employment contract and are remunerated and paid according to the standards of the Collective Labour Agreement.

Everyone (if deemed eligible) is given the opportunity to develop and grow to another position.

Health

Did you know that flowers and plants have a healthy effect on people?

  • Plants provide air purification..
    People breathe in air, take out oxygen and breathe out carbon dioxide. In the case of plants it is the other way around. During photosynthesis, plants remove carbon dioxide from the air and convert it back into oxygen. The amount of oxygen in the air is increased by the presence of plants, which makes breathing easier.
    Air-purifying plants can absorb harmful substances from the air through their leaves. These harmful substances are then stored and broken down in the plant’s roots. These plants can also break down dirty odours, so they are actually natural air fresheners.
    For the sake of clarity, every (indoor) plant produces oxygen, but not every plant also purifies the air. Air-purifying plants are e.g. the Spathiphyllum, Calathea, Hedera helix (ivy), Areca palm and the Ficus. For many plants we do not yet know to what extent they have an air purifying effect since they have not yet been tested.
  • Plants ensure a better concentration and a reduction of stress.
    Plants create a relaxed and better atmosphere, also at work.. Plants make the workplace a more pleasant place to work.
    Apparently there is even a relationship between the presence of plants and the productivity of employees.
    Moreover, the presence of plants has a positive effect on the creativity and concentration of people.
  • Plants reduce the dryness of the air
    The dust content and humidity in the house are strongly related with each other. The dryer the air, the more dust. This can cause symptoms such as a tickling cough, dry skin, headaches and irritated eyes. By watering plants, it finally evaporates again through the stomata in the leaves. Plants can thus increase the humidity of the air, which therefore benefits the air quality.
  • Plants provide a pleasant and warm feeling
    Research has shown that plants are good for people in various (subtle) ways. They play an essential role in creating a pleasant, natural and quiet environment in which to move, work and/or relax.
  • Did you know that flowers too have a healthy effect on people?
    Flowers can brighten up any room in a magical way. They give meaning to our emotions such as love, joy, comfort, compassion and sorrow. Flowers provide a relaxing effect on our constitution. They provide positive energy in the home and a warm feeling. In short, everyone is just very happy about that!

Care

Innovation

The Dutch greenhouse horticulture sector is worldwide renowned for its innovative power. In order to be one step ahead of the competition from other parts of the world, people are constantly looking for better efficiency in the use of raw materials and space. This, of course, without compromising the (top) quality of the Dutch product.

The glasshouse horticulture sector in the Netherlands can cope with this rapid pace of innovation thanks to a strong relationship between research and practice. In addition, a great deal of knowledge is exchanged between the entrepreneurs in order to make progress together. The flower auctions are a good example of this as one of the largest cooperatives in the world.
Below we describe a few examples of this innovative power.

 

Biological control and integrated pest management
In order to minimise the use of pesticides and to find a better balance between parasites and their natural enemies, natural enemies of the parasites are used in the greenhouses. Thanks to the intensive exchange of knowledge between the growers and their suppliers, growers are increasingly able to produce a top quality product with organic solutions.

 

Combined heat and power (CHP)
Combined heat and power (CHP) is a large engine, originating from the shipping industry. Only it has been converted to run on natural gas. The efficiency of this motor is higher than traditional gas boilers. These engines drive a generator that generates electricity. This electricity is used in the company’s own nursery or is supplied back to the public electricity grid. The ‘residual heat’ produced by the engine is used to heat the greenhouses. After cleaning, the exhaust gases can be used to provide the plants with CO2. All in all, these motors provide an efficiency that can be up to 20% higher than the traditional method of heating (gas boilers).

 

Geothermal energy
Geothermal energy is used for this type of energy. A drilling tower is used to drill a well to a depth of 2-3 km. At this depth, water of more than 80 degrees can be ‘collected’. This heat is used to heat the greenhouses and then the cooled water is returned to the soil via a second source. It is expected that these sources will be able to continue to produce sufficient heat, even longer than the life of a greenhouse.

Drilling the well is an enormously expensive investment. In addition, there is a great risk that the drilling will ‘fail’. By working together with each other and with governments, in the Netherlands we are able to gain experience with this way of heating greenhouses sustainably.

 

Water purification
Plants need water and nutrients to grow. More and more nurseries are making use of the reuse of drainage water. This is water that is collected before it disappears into the subsoil. This ‘drainage water’ still contains many nutrients that can be used by the plants.
By reusing this water and mixing it with clean water, less fertilizer is used.
However, the drainage water also contains some ‘wrong substances’. The content of these wrong substances determines how much water can be reused. The application of new techniques creates opportunities to filter these ‘wrong substances’ out of the water.

 

Diffuse glass
In new constructions, more and more growers are opting to cover their greenhouses with diffuse glass. Diffuse glass ensures that light is distributed much more evenly across the crop without any shade or light spots. This leads to a more even greenhouse climate.
Temperature and humidity can thus be controlled more accurately, which means, for example, that the opening of the air windows can be limited, which leads to lower CO2 emissions.

 

LED lighting in greenhouse horticulture
A new innovation in horticulture is the use of LED lighting. This lighting is not comparable with LED lighting used in consumer use. In the horticultural sector, the lighting is produced by ‘power LEDs’ and therefore much higher. The major advantage of these ‘power LEDs’ is related to sustainable business practices: energy savings compared to high-pressure sodium lamps (orange-coloured lighting). This saves more than half of the energy.
Another major advantage is that when using LEDs, crops can be better controlled using the different colours in the light. This is in favour of a better growth and a higher quality of the product.

error: Content is protected!