In certain types of forest nutrient deficiencies can appear at a time when manual fertilisation is not an option. In a case like this fertilising by helicopter is the only alternative. The helicopter is a quick and accurate distributor of fertiliser. However, it is expensive so an owner must be sure that this expense is justified.

The first step is to establish whether fertiliser is required at all. A visual assessment of the crop should be carried out by a qualified person. A foliar analysis should then be done to establish what nutrients are required and their application rate.

Having obtained a Foliar analysis report and decided that fertilising is necessary a forest owner must apply for permission to fertilise aerially from the Forest Service. Permission may not be granted if the site is in an area of high sensitivity from a water quality or fisheries point of view.

Once approval is obtained the fertiliser and the helicopter should be organised. A level site clear of overhead obstructions should be arranged. This should be close to the affected area of the crop to minimise flying costs and thereby cost. The helicopter should complete its job and a computer-generated map of the area is produced showing the area fertilised. A copy of this is usually forwarded to the Forest Service.

Helicopter fertilising requires a good deal of organising and preparation can be time consuming.

Forestry Services Ltd. provide a professional fertilising package covering initial site visit, foliar analysis, provision of helicopter and fertiliser as well as supervision and disposal of waste. Contact your local forestry services manager for details and a free site assessment.