Irrigation New Zealand

INZ is currently producing a resource book on designing, installing, operating and managing fertigation in NZ – this will be available in Spring 2018

Backflow Prevention

It is common for irrigators to apply effluent, fertiliser and agrichemicals through their irrigation systems in New Zealand. This is known as chemigation or fertigation. If correctly diluted effluent, fertiliser and agrichemicals can be very effectively, efficiently and safely applied by injecting them into water flowing through a properly engineered irrigation and injection system. INZ has produced an industry best practice guideline for the safe management of irrigation systems that have effluent, fertiliser and/or agrichemical injection.

New Zealand Guideline for the Safe Management of Irrigation Systems with Effluent, Fertiliser and/or Agrichemical Injection

This guideline is intended for designers and installers of irrigation systems with effluent, fertiliser and agrichemical injection. This may include engineers, equipment suppliers, and specialist irrigation designers. The design, installation and testing processes described in this guideline are intended to be applied to agricultural irrigation systems. The guidelines do not amend or replace other industry performance indicators, guidelines, codes of practice or standards. Designers and installers should interpret the guideline according to the requirements of individual properties and owners. All decisions made must also comply with statutes, regulations, and other legal requirements and industry standard

The guideline covers safe management practices and more specifically the recommended safety devices and systems to be used when injecting effluent, fertilisers, herbicides, pesticides and other agrichemicals into irrigation systems. It has been adapted from ASABE 409.1 MAR 1989 R2009. The guideline is not intended to replace backflow protection device recommendations for irrigation systems connected to a sanitary system in NZ. AS/NZS 2845 (2010) is the applicable standard for these scenarios. For irrigation systems where the water source is also used for rural drinking water the NZ Drinking Water standards may apply and impose conditions relating to hazards management.

Environment Canterbury have put together a guide to provide irrigators in the Canterbury region with information on chemigation valves for backflow prevention: Canterbury Backflow prevention Guidelines


Wednesday 11 April–12 April

10:00 am - 17:00 pm

Join us for a two day Fertigation Master Class

When: 11th and 12th April 2018

Where: Lincoln Event Centre

Cost: $650 +GST

Places are limited so get in early to avoid disappointment.

The outcome of the class is to produce a resource that will provide irrigators with clear information for successful fertigation, including costs and benefits, good management practice knowledge resources and related training opportunities.

It will also enable irrigators and their service industries to inform and achieve any future regulations around fertigation equipment and practice.

The master class will help to unlock the future potential of fertigation in NZ through providing answers to the following questions –

  1. What are the costs and benefits of fertigation?
  2. What are the equipment options for fertigation and to which scenarios are they best applied?
  3. What does ‘good practice’ design, installation and management look like?

The programme involves presentations on each topic followed by discussion and agreement that these are industry accepted standards. There will be a field trip on the afternoon of day 1 as well as a dinner on the Wednesday night. Full programme will be released soon….

The price for the master class is $650 + GST

Notice of withdrawal: 7 days – 50% registration refunded or transferable to another person, 3 days – no refund – transferable to another person

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Wednesday 9 May

09:00 am - 17:00 pm

Water Meter Verification Workbook training day.

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Tuesday 15 May

09:00 am - 17:00 pm

Water Meter Verification Workbook Training day - Taupo

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