Wet conditions present a risk for farmers cutting, baling and storing hay while the sun shines to beat the next bout of predicted rainfall.
If hay producers do not allow enough time for grass and crops to dry out before baling, it can present a high risk for spontaneous combustion.
“Spontaneous combustion in hay occurs when internal heat builds up to the point of ignition as a result of microbial activity and chemical reactions,” Agriculture Victoria dairy development officer Andrea Henry said.
“Unlike fires caused by lightning or machinery, spontaneous combustion is insidious: it starts deep within a haystack and can smoulder unnoticed until it erupts into flames.”
Hay baled with more than 20 per cent moisture is at risk, as mould growth and fermentation occurs when moisture levels are between 20 and 35 per cent.
The storage of hay is also an important consideration, as significant exposure to rain increases the likelihood of haystack fires.
Storing tightly packed bales with poor ventilation or in unmonitored and enclosed sheds or barns increases the risk of combustion.
CFA District Two assistant chief fire officer Archie Conroy said farmers choosing to continue with hay production should ensure future storage and transport of their product is considered.
“Hay fires are a real threat to properties and stock in farmland areas,” he said.
“Whether you’re a seasoned hay grower or switching to hay this year, it’s really important to take care of your hay and crops this fire season.”
Farmers are encouraged to regularly inspect bales for signs of heating, as the CFA attends dozens of haystack fires per year.
Steam, a musty, caramel, or tobacco-like odour, mould growth on or inside bales, condensation or corrosion under roofing, or a slumping haystack can indicate potential combustion.
A temperature probe or metal rod can be used to detect internal heat, with a rod too hot to hold after inspection indicating the need for emergency help.
For more information, visit www.cfa.vic.gov.au/plan-prepare/hay-and-fire-safety
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