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About MainFert - Your Nutrient Partner

We like to think of ourselves as providing solutions to a whole range of challenges facing today’s primary producers. There is no “silver bullet” product out there – just good innovative advice based on research and experience.


Your Nutrient Partner

MainFert is a rapidly growing and recognised fertiliser company giving personalised service to our clients. It is an independent and locally owned company employing dedicated representatives covering the country.

We have been in business for over 30 years offering environmentally sustainable alternatives to habitual fertiliser companies. We focus on the client, the farming system, the soil and the long term.

Like all businesses we have grown and evolved over time, many will remember us as Mainland Minerals. Mid 2020 we conducted a company review and felt  our brand name needed to evolve and more accurately reflect what we do and how we help our clients in todays environment.   

MainFert is still grounded by all the same principals and values you’ve come to know and trust, it’s business as usual, just with a different name.

What drives us

Our Philosophy

We help farmers to achieve their financial and environmental goals through their biggest asset, their soil. We have a no nonsense range of fertilisers, offering value for investment and proven results.

Soil is the foundation of primary production. Mainfert’s approach is to balance the 3 key parameters of the soil – chemical, biological and physical.

Achieving this balance gives an efficient, working soil system, as nature intended. To us a spade is one of the most important tools a fertiliser rep can carry – we look for good rooting depth, plenty of worms and a well aggregated soil structure.


Meet our Management Team


Becky Wilkins

General Manager

Tim Scott

Operations Manager
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Wilene Chua

Finance Officer

Meet our Office, Store and Spreading Team


Denise Williams

Administration Officer
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Richard Hughes

Factory Manager

Dave McGann

Factory Operator

Eric Natinga

Spreader Operator

Meet our Nutrient Advisors

Dean 2000

Dean White

Director & Senior Nutrient Advisor

Mid Canterbury / Nelson / Marlborough


Chris Gardiner

Senior Nutrient Advisor

Central Canterbury / West Coast


Michael Osborne

Nutrient Advisor

North Canterbury

Guy Gibson

Guy Gibson

Senior Nutrient Advisor

Mid Canterbury

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Jonathan Siegert

Senior Nutrient Advisor

South Canterbury


Warren Bloxham

Nutrient Advisor

South Canterbury/North Otago

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Dr. Gordon Rajendram

Independent Soil Scientist & Nutrient Advisor


Events / Sponsorship


Mainfert proudly supports our community and attends numerous tradeshows and events throughout the year. For sponsorship or event enquiries please call 0800 222 203.


Mainfert currently sponsors a number of businesses, organisation and events around the South Island.

We support A&P Shows annually in these locations:

  • Christchurch
  • Oxford
  • Hawarden
  • Amberley
  • Banks Peninsula
  • Ellesmere
  • Ashburton
  • Mackenzie District

Lets connect soon!

One of our experienced nutrient advisers looks forward to speaking with you soon.  Simply complete your name and details below and we will call you back.

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