The Probitas System was developed by farmers for farmers



Ewan Campbell is a typical ‘kiwi bloke' who grew up on his father's dairy farm near Te Aroha and became thoroughly familiar with what constitutes poor and deficient land. He bought a property near Waihi and began farming on what was initially very depleted soils holding some of the highest aluminium levels of any soils in the world according to Brookside Laboratory. During sixteen years of observations and trials Ewan developed an eco-safe and sustainable system of farming based on complete mineral and biological balance. He also undertook a period of study of soil testing methodology with Brookside Laboratory from the United States.




After applying what has become known as The Probitas system to his property the property now has lush and nutritious herb, clover and grass pastures growing in a rapidly developing, biologically active soil which forms the foundation for a successful and sustainable organic farming business supplying beef and lamb to Cambrian meats. The New Zealand patented Probitas product is now and used as part of the Probitas system by farmers nationwide and is endorsed by hundreds of users throughout the country. The system enjoys organic certification by both Agriquality and Biogro.





Ewan's achievements began to attract attention and a growing stream of people came to see the farm. More publicity courtesy of the media led to a steady stream of interested people from all over the country keen to learn the system. Some of these people began the process of learning the system and applying it to their own farms. Their success led them to begin promoting The Probitas system in their own areas. These people formed themselves into The Probitas group.



Ewan Campbell


Malcolm Campbell moved onto a bare peat block on the edge of the Hauraki Plains in the early 1950's where there was only 12 foot high scrub and proceeded to break the land in. This was done through crushing T tree with giant rollers and then ploughing with large swamp ploughs pulled by caterpillar tractors. Starting from scratch allows certain processes to be seen for what they are instead of being muddied from previous peoples work. There were many indications on what has unraveled over the proceeding 50 years as to some of the vagaries of soil science and production which were observed by Malcolm Campbell and his father Sam.


I arrived late in 1964, the last in a family of four. Growing up on raw peat is an interesting process especially when it comes to keeping vehicles above ground. A challenge that most people cannot comprehend.


Through to 1982 cattle and sheep were farmed and on my departure from school a cow shed was erected supposedly to keep me in a job. For the next 10 years on and off between overseas travel I milked cows, ploughed paddocks and cleaned drains yet the yearning to go back to beef farming remained and the desire to see what farming away from the peat would be like was strong.


In 1992 my wife Julia and I purchased 200ha 12km from Waihi at the base of the Coromandel Peninsular. This is where my inquisitiveness really came into its own. The need to improve the property we had just purchased was at the top of the list due to low performance and the continuing rise in the dollar which cut returns in half over the proceeding three years. Due to the financial restraints results were purely financially based on input against return. These were tested on trial plots scattered around the farm on a large range of products on the market including by-products, standard fertilisers and liquid supplements.


As experimentation continued I also trained as a Brookside soil Consultant and traveled to courses overseas to gain as much knowledge on the subject as possible. Significant changes in pasture quantity, quality and animal performance became apparent and this led to the launch of Cambrian Meats. This business offered the opportunity to capture the quality and full value of the beef products reared on the farm and was the result of the combined skills and hard work of myself and Julia. National food awards for innovation and excellence testify to the progress made along this journey.



Early in 2000 I started to observe the influence of silica on production and through a fair amount of luck, observation and testing discovered the electrical trends of the soil and the effect some forms of silica seemed to have on this phenomenon. Much more study into how to get the best from this information ended with a patent application for a new product. (Finally accepted June 2007). At this stage many farmers were starting to take notice of the results I was achieving from production through to final quality of our beef. Many farmers visited the farm and as a result Probitas was formed, really by the farmers for the farmers.


Our farm has evolved into a wonderful place that continues to surprise us with its potential as a farm and as a home for myself and my family.

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