Our team

BioAg operates with a small, efficient team of hard-working employees. Our area managers and agronomists serve South Australia, Victoria, New South Wales and Tasmania. 

All our area managers are experienced on the land. They are located in regional areas across the southeastern states of Australia. From day to day they are either in the field helping farmers with advice and tailored programs or undertaking research including trials of BioAg programs and products.

Reception and accounts staff operate out of head office in Narrandera, providing customer service and team support.

Staff at the liquids plant at Narrandera and the solids facility near Geelong ensure our products are stored, maintained and shipped efficiently to your farm or distributor.

Our operations manager and leadership team work from a number of locations in south-east Australia, ensuring the smooth running of the company.

Our distributors and partners in Australia, the UK, New Zealand and South Korea work with their local customers to provide tailored programs and advice and supply BioAg products for improved productivity and yield for farms of all kinds.

The BioAg team

Anton Barton

Executive Chairman


02 6958 9911

Anton is one of the original founders of BioAg P/L and a long-time authority in the practice of biological farming.

Martin Metz

CEO & Director


02 6958 9911

Martin has over 30 years’ experience in the Australian fertiliser industry, in both national and international lead roles.

Stephan Logoida

Horticulturalist & Viticulturalist

Riverina / NSW / Vic / SA / Tas

0417 195 972

BScAg, PhDScAg

Working in the Riverina region of NSW, Victoria, South Australia and Tasmania, Stephan works with growers looking for great results from their vines as well as apple, cherry and other tree crops. Give Stephan a call to arrange an on-farm visit.

Paul Medlock

Area Manager

Northern NSW

0429 820 360

Bachelor of Management
(Farm Business Management)

Paul has gained much experience from various positions held in the agriculture and livestock industries, in farm and area management, and specialist research in animal health for Government and private enterprise. He is currently undertaking a Master of Science in Agriculture, through the University of New England, Armidale.

Phil Toy

Area Manager

South Australia

0458 440 225


A Roseworthy Agricultural College graduate with a family farming background on Eyre Peninsula, Phil has the knowledge and practical experience which provide an understanding of the key constraints to production and profitability.

He has had a long career with agricultural chemical and fertiliser companies that has included state managerial roles.

Peter Emerson

Area Manager

South East NSW & North East Victoria

0438 269 939 

BAppSc/BSc (CSU)

Growing up on a family farm in the Holbrook area, Peter has worked extensively in agriculture – primarily focused on broadacre pasture and cropping systems. His knowledge and experience have included sales agronomy and advice, research, seed technology, and horticulture/viticulture. He has a keen interest in biological systems and soil health and how farmers can improve their efficiency through the correct inputs and management techniques.

Slobodan Vujovic

Area Manager

SE Victoria & Tasmania

0448 453 412


Slobodan has over 25 years’ experience in the Australian agricultural sector, working with government research organisations, agricultural industry associations and ag suppliers and providers.

He brings to the BioAg team extensive knowledge in general agronomy, soil health, pest and disease management, ag biosecurity, and irrigation. In addition, Slobodan is passionate about sustainable and resilient farming practices.

James Mwendwa 

Area Manager


0459 474 550


With a lifetime of farming experience having grown up on the family farm in Kenya, and 10 years spent in New Zealand working in the dairy industry, James is a skilled broadacre extension agronomist and passionate agricultural researcher. He completed his PhD in 2019 at Charles Sturt University successfully gaining his Doctor of Philosophy in Agricultural Science.

James brings significant research, trial knowledge and hands-on experience in farming systems with expertise in agronomy, crop protection, herbicide resistance, soil nutrition and biological health, to help farmers drive their production profitability. He has a keen interest in biological systems, soil health and cultural weed management and how growers can improve efficiency through the correct inputs and management techniques.