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13 January 2020

A good drawing is half the work

A good drawing is half the work

Gerben van Veldhuizen and Teus de Jong owners of FruitSecurity Holland. Both advise from the purchase of a hail net systeem and they assemble the nets with their own platforms. Van Veldhuizen:''The most important thing for a good hail net system is the correct anchor distance and the construction. We measure the anchor distance from the foot of the angled end post. For traditional hail nets and flat nets this is 2,5m and 3,0m'' respectively. 

The company owns a digital anchor tester with which up to 6 tons can be tested. An anchor must have a minimum tensile strength of 3 tons. Because most tractors pull about 2 tons, the company usually uses a telescopic handler or shovel. In case of doubt about the ground, we take a sample. Mostly clay is acceptable,''says van Veldhuizen. For foil and flat net, anchors with a diameter of 40cm are good enough; for traditional hail nets, 30cm is good enough. Provided the anchor consists of the right type of steel. 

Anti-sinking plates on the post prevent the angled post from sinking into the ground. De Jong:''The importance of anti-sinking plates is ofter underestimated. The plate is about 5cm below ground level, so that machines do not hit the plate. 

Correct relation

The construction of the posts- posts thicknesses and posts distances- has now been optimised. It is mainly about the right balance of force. The more steel wires in the concrete post or the ticker the wooden or concrete post, does no apply. 30 to 35 square metres per post will be good. Many growers overestimate the high UV value (Kly-value) of nets. All damage to nets is mechanical damage, whil the UV value is still fine. The higher the UV value, the more fragile the net and the earlier mechanical damage occurs,'' says De Jong. If the net breaks at the post or on the needle thread, a new net just has to be put on it''. The net colour, usually crystal in the Netherlands, is chosen by the grower himself.

In addition, the higher the system, the less climate variation under the net or foil. Build at least 4 meters high. Also consider in advance the puchase of machinery and the labour costs per hail net system for the annual work such as closing and opening nets. And immediately install longer poles if you might roof over them in the future,'' both entrepreneurs advise.

Plot design

Think about the parcel design beforehand as well. With nets, it is also useful to cover frontline for insects and birds. Keep space for anchors of the system,'' according to the specialists. The location of the plot entrance is also important, as is the location of, for example, a pump house and/or fertigation unit. And also important for drainage, for example: are there places where the plot ends? Good consultation with FruitSecurity Holland is essential before installation starts. A complete parcel design of the new parcel to be realised facilitates the construction. For example, contractors avoid object in the ground such as cables and pipes and take buildings or other objects into account. Detailed quotations can also be made on the basis of the parcel drawing. For example, the number of the posts and the required clips. FruitSecurity Holland's land surveyor therefore walks around the plot with the grower before making the design.

Parcel layout


FruitSecurity Holland expands plots using GPS (Global Positioning System).