Agriculture has always been a battle between biology and the elements, but in Western Australia it has long been an exercise in outsmarting the climate itself. As the world warms and dries, much of the public conversation has focused on what farmers will lose. The real story — the one told in labs, field trials, machine sheds and paddocks — is what farmers have already gained. Science, not slogans, is the reason Western Australia remains one of the most resilient grain belts on earth.
It’s worth remembering what Bill Gates once said: “Innovation is the most powerful force for improving the world. It’s how we’ll feed a future population of 10 billion.” At the same time, Einstein’s wry observation — “Science is a wonderful thing, if one does not have to earn one’s living at it” — captures the unglamorous reality of scientific work, particularly the kind that involves dust storms, sandplain soils and long drives between trial sites not to mention the lack of financial reward.
Agriculture advances because thousands of researchers persistently chip away at biological problems most people never see.
A century ago, the Wheatbelt stood on the edge of its first revolution. In the 1920s and 30s, WA farmers moved from horses to small tractors and Sunshine harvesters,
while a fledgling group of researchers at UWAs new Faculty of Agriculture began one of the earliest agricultural science programs in the country. Their work was not theoretical. Many of those early scientists were effectively agricultural detectives, tracking down the cause of mysteriously barren paddocks. They uncovered the copper and zinc deficiencies that defined WA soils; they mapped the power of superphosphate on fragile sands; they explored sub-clover rotations long before soil biology became fashionable. Wartime urgency pushed plant breeding and mechanisation forward at breakneck speed. Agricultural science in WA wasn’t a branch of academia — it was an applied survival program.
As the post-war decades unfolded, WA experienced its own “mini green revolution.” John Gladstones’ domestication of lupins remains one of the greatest scientific achievements in WA’s history, turning millions of hectares of useless sandplain into dependable cropping country. Farmers rapidly adopted fertilisers like DAP and urea, shifting from guesswork to chemistry. Through the 1970s the chemical age took hold, with 2,4-D, Paraquat and early Roundup fundamentally altering what was possible. Weeds that once defeated entire districts were suddenly controllable, and continuous cropping — unheard of in the 1960s — became feasible. Herbicides didn’t just kill weeds; they unlocked entirely new farming systems, paving the way for stubble retention, conservation agriculture and minimum till.
Then came the horsepower era. By the 1980s and 90s WA machinery sheds were filling with large four-wheel-drive tractors, tracked machines, air seeders and self-propelled sprayers took over. Beneath this horsepower revolution was something more subtle but far more important: soil compaction research. UWA and CSIRO scientists conducted painstaking trials that rewrote our understanding of pressure, wheel load and root architecture. Their work influenced machinery design worldwide and laid the foundation for controlled-traffic farming. By the turn of the century, farming had shifted from a mechanical art to an engineering discipline.
Then satellites joined the farm. GPS, yield mapping and early variable-rate systems turned paddocks into spatial data problems. The 2010s layered sensors on top of satellites: drones, NDVI imaging, moisture probes and machine-vision sprayers. The paddock ceased being a black box. For the first time, farmers could “see” their crops in a literal scientific sense — measuring variability, biomass, moisture and nitrogen response as data streams.
Now we’ve entered what might one day be called the Algorithm Era. Modern broadacre farms generate terabytes of data a season. Machine-learning models predict nitrogen response curves, disease risk, frost zones and soil constraints. Driverless machinery is no longer a concept; it is a product waiting for regulatory approval. Decisions once made over a fence now run through software ingesting millions of datapoints daily. The average tractor console contains more computing power than the entire Apollo program.
All of this scientific progress would be remarkable in any climate — but WA has done it while rainfall has fallen away beneath our feet. Since 1975, winter rainfall has dropped 15 to 20 per cent, growing-season rainfall by 50 to 60 millimetres, runoff by 80 per cent and the 300-millimetre rainfall line has shifted seventy kilometres south. In almost any other agricultural region on earth, these numbers would spell collapse. Yet WA grain yields have tripled.
This is not luck. It is physics. WA once produced around five kilograms of wheat per hectare per millimetre of rainfall; our best operators now produce fifteen kilograms. Water-use efficiency has tripled not because skies have become kinder, but because farmers — armed with scientific knowledge — have become harder to defeat. Soil inversion breaks compaction; deep ripping unlocks root depth; stubble retention protects moisture; controlled-traffic farming preserves soil structure; variable-rate systems apply nutrients with surgical precision; genetics squeeze more carbohydrate out of every photon of sunlight.
Even on my own farm in Corrigin, the transformation is unmistakable. We once used three full-time men, three Chamberlain tractors and six combines. Today we crop 1,000 hectares with two part-timers, a 20-year-old 60-foot bar, an old 400-horsepower tractor and a GPS-guided rate controller — a shoestring, science-amplified operation next to neighbours running 800-horsepower rigs across 6,000 hectares. WA now has only 2,000 grain farms, down from 20,000 just decades ago, yet total output keeps rising. The largest 700 farms produce 70 per cent of the state’s grain. A top-tier WA enterprise now harvests 20,000 tonnes — enough to feed 80,000 people — and operates as a $50–$100 million scientific enterprise grounded in soil physics, engineering, mathematics and genetics.
The global story is even more dramatic. The world grows three billion tonnes of grain on 700 million hectares — an area the size of Australia — using roughly 500 million farmers. That’s six tonnes per farmer. A modern WA family enterprise can produce 50,000 to 60,000 tonnes. If the world used WA-level machinery and science, it wouldn’t need 500 million farmers. It would need 100,000.
This modernisation isn’t merely about efficiency; it is about environmental salvation. Norman Borlaug — the plant pathologist who launched the Green Revolution — doubled cereal yields across Asia in a decade, saving over a billion people from starvation. In doing so, he prevented the clearing of one billion hectares of forest and grassland. Technology didn’t destroy ecosystems; it spared them.
Today, the next revolution is taking shape. AI-designed, gene-edited cereals promise drought, heat, disease and frost tolerance. A 50 per cent yield uplift would allow the world to produce its grain from 230 million fewer hectares — the size of Western Europe, half the Amazon or the entire global area of rainforest lost since the 1980s. A one per cent yield increase prevents six million hectares from being cleared.
Herbicide reductions provide similar gains. The world uses 1.8 billion litres annually. GM crops that cut use by 10 to 20 per cent would eliminate six to twelve thousand B-double tanker loads of chemicals. And the idea that organic farming could replace this system is fantasy: global organic conversion would require clearing an area the size of Australia just to maintain current output.
Even carbon emissions bend under the weight of agricultural science. WA produces a tonne of wheat with one-twentieth the labour of Europe and among the lowest emissions per tonne anywhere in the world. If the global grain industry farmed like WA, emissions would fall by 600 million tonnes a year — and more than three billion tonnes if freed farmland were reforested.
The machinery numbers alone tell the story. A modern Class 11 header harvesting 1,000 tonnes a day produces 3.4 billion calories — enough to feed 1.4 million people. A single day’s work from one machine feeds half of Perth. You would need 3,000 labourers with sickles to match its output. A 90-foot seeder replaces the work of 2,500 horses without needing to grow the feed to keep them alive.
And despite all of this, we remain only halfway to wheat’s theoretical biological limit. C3 cereals can theoretically produce around 35 kilograms of grain per millimetre of water. WA averages 10 to 15 kilograms — up from five in the 1970s — meaning we still have enormous room for improvement. The next frontier is biological: genetics, metabolism, water-use pathways and photosynthetic efficiency. The biggest leaps are still ahead of us.
If the Green Revolution saved a billion lives, the next wave — AI, gene editing, advanced agronomy and precision mechanisation — will help turn global population growth into decline as food security drives prosperity and prosperity drives smaller families. It will also allow the world to restore ecosystems at a scale protest movements can only dream of.
People often argue that climate action requires shutting down or restricting agriculture. They’ve got it completely backwards. Only science can make agriculture efficient enough to free land for nature while feeding a growing world.
That has been the story of Western Australian farming for fifty years — not decline, but adaptation; not depletion, but innovation; not ecological collapse, but ecological opportunity made possible by science.
And so the lesson that Norman Borlaug left us still stands: peace begins with a full belly. Agricultural science is what keeps those bellies full. Every breakthrough that lifts yield in a drying climate strengthens not only WA’s food security, but global stability.
In the end, agriculture isn’t simply an industry. It is civilisation’s life-support system. And in Western Australia, that system has never relied more on the power of science — or delivered more because of it.
Speech delivered to the UWA Faculty of Engineering by Trevor Whittington, CEO WAFarmers
