A Record-Breaking El Niño Is Underway: What It Means for Australian Farmers

Most of us have been through an El Niño year before. What gets less attention is that an El Niño year for farmers is as much a commercial event as a weather event, and most of the decisions that determine what it will cost are made months before conditions change dramatically.

Those decisions are harder to make this year. The event developing in the Pacific is behaving unusually for an El Niño, and the indicators behind it sit well outside the range of a typical season. In this article, we look at where the current event stands against past El Niño years, what those years have cost Australian agriculture, why this one is reading differently from one region to the next, and which decisions carry the most weight when they are made early.

In late August, the ocean temperature index the Bureau of Meteorology uses to track El Niño reached +2.45°C, more than three times the threshold that defines an event. Bureau climatologists describe the rate of Pacific warming over the past six months as the fastest on record, and modelling suggests it hasn't peaked, with some forecasts pointing to a peak as high as 3.6°C. A peak of that size would surpass every El Niño on record, including the 1982/83 event that preceded the Ash Wednesday bushfires and one of the worst droughts of the past century. What that record tells growers, though, is only how unusual the event is. The relevance for agriculture sits in what followed that event rather than in the temperature itself. Australia's worst El Niño years have a consistent effect on growing conditions, and a well-documented effect on production.

What El Niño usually means for Australian farms

The Bureau's analysis of past events points to some consistent patterns for the southern and eastern half of the country:

• Below-average rainfall through winter and spring, especially in the east

• Above-average daytime temperatures across most areas, except parts of the north

• Increased frost risk, since clearer skies let more heat escape overnight

• A higher chance of extended heatwaves and elevated fire danger later in the season

Those conditions carry a documented cost. Research from the ARC Centre of Excellence for Climate Extremes found that nine of the ten driest winter to spring periods on record in south-east Australia occurred during El Niño years. On average, farm gross domestic product falls by around 13 per cent during an El Niño year. In 2002/03 the effect ran well past that average: national wheat production fell 58 per cent, from around 24 million tonnes the previous season to 10.1 million tonnes.

Each El Niño is different, and this one is already diverging from the historical pattern. That changes what growers should be planning for.

Why this year is harder to read than most

Every El Niño behaves differently. Winter to spring rainfall in the El Niño year of 2002 looked very different to the El Niño year of 2015, and this year's event is already behaving unusually on its own terms. Despite record ocean temperatures, Australia has seen more rainfall so far than a typical El Niño year would suggest. The Bureau's spring outlook currently shows below-average rainfall for the south and east alongside above-average rainfall across much of the west, with warmer coastal waters raising the risk of heavier, higher-intensity rain events even inside an overall drier pattern.

What that means in practice is that the risk this season is regional rather than national. In the south and east it sits where it usually does in an El Niño year, with rainfall leaning below average. In parts of the west, it is more likely to arrive as too much water at the wrong time.

Preparing before conditions turn

The growers who handle an El Niño year best are usually the ones who started adjusting while the season still looked open:

• Track the outlook for your own region rather than the national headlines. The Bureau's long-range forecast is updated regularly and reflects current conditions better than any single news story.

• Get feed and water budgets sorted early, before fodder and water both become harder and more expensive to secure.

• Review stocking rates ahead of the crowd. Destocking decisions made early tend to cost less than the same decisions made under pressure.

• Build flexibility into planting and marketing decisions, particularly for crops sensitive to a shortened growing window.

• Factor frost risk into variety and timing choices, given the clearer skies El Niño tends to bring.

• In regions currently leaning wetter, plan for the opposite problem. Heavier rain events and waterlogging carry their own cost in a season that is still running warmer than average.

Each of those decisions manages a farm's exposure to the season. The crop's own capacity to handle what the season delivers is worth planning at the same time. A moisture-limited crop is usually a nutrient-limited one as well, and while rainfall may be the trigger, a good share of the eventual yield loss comes down to how well the crop can access what is still sitting in the soil profile.

Building resilience into the plan

CropBioLife is a foliar spray made from naturally occurring flavonoids. Flavonoids are compounds crops already produce to protect themselves, and CropBioLife supports that response by improving nutrient uptake. It is applied proactively, ahead of a stress event rather than after one, and it sits inside an existing spray program rather than replacing it, so it can be planned in now alongside the water, feed and planting decisions above.

The window to prepare is now

The Bureau's modelling suggests this event is not finished intensifying. The most useful next step is checking the long-range forecast for the relevant region, since the outlook varies considerably across the country. From there the season's planning decisions can be made with a clearer picture, and made early enough to matter. For growers weighing where CropBioLife fits into that planning, more detail is on the Climate Stress Resilience page or directly from the CropBioLife team.