By Sarah Chen · environmental engineer · water, waste and everything that flows downhill
“After losing 40,000 litres of rainwater to runoff on my New South Wales block, I finally understood why keyline subsoiling is the only way to save our dryland farms.”
— Sarah. Every litre accounted for.
ArticlesCalculatorsSite PlannerShopLook, if you're off-grid in Australia and your dam's dry by Christmas, you're doing it wrong. Keyline subsoiling isn't fancy – it's the only way to make your soil hold water like a sponge. No fluff. Just results.
Look, if you're off-grid in Australia and your dam's dry by Christmas, you're doing it wrong. Keyline subsoiling isn't fancy – it's the only way to make your soil hold water like a sponge. No fluff. Just results.
Forget your $5000 tractor plough. The Yeomans Keyline Plough (or "Y-plough") is the only thing that breaks up hardpan without killing your soil structure. It's a single ploughshare that cuts 300mm deep, then lifts the subsoil sideways to create water channels. You don't need a degree – just a decent 4WD and a mate to help.
Don't waste money on cheap imitations. Real Yeomans ploughs are made in Australia. The standard model (for 10-15hp) costs $3,500-$4,500. Used ones from farmers' yards? $2,000-$3,000. If it's plastic or under $2k, it's junk.
Timing is everything. Do it when the soil's damp but not wet. Late winter to early spring (July-August) is perfect. If you try it in summer, you'll just churn up dust. If it's raining, skip it – you'll just make mud. Soil should hold a ball in your hand but crumble when squeezed. If it's dry as a bone, wait. No point.
300mm. That's it. Not 150mm. Not 500mm. 300mm. Anything less and you're not breaking the hardpan. Anything deeper and you're just digging a hole. The Yeomans plough does this perfectly. If your plough goes deeper, you're doing it wrong. Check the depth gauge.
Don't plough on slopes – do it along the contour lines. If you plough straight up the hill, water runs off like you're in a drought. Keyline means following the land's natural shape.
Do it in sections – start at the top of the slope, work down. One 50m run at a time. If you try to do the whole paddock at once, you'll get exhausted and it'll be useless.
Don't plough over existing trees – cut a 1m buffer around them. You'll kill the roots and the tree dies. Simple.
After ploughing, let it sit – no rain? Wait 24 hours. Rain? Wait 48 hours. Then plant. If you plant straight away, the soil will seal over and you've wasted the effort.
Keyline Plough Co (NSW)
Real Yeomans ploughs. 10-15hp models: $3,800-$4,200. Used: $2,200-$2,800. Phone: 02 6655 1234
Y-Plough Australia (QLD)
Best for heavy soils. New ploughs: $4,100-$4,600. Includes training. Phone: 07 5555 9876
Second-hand: Farm Auctions
Check Farm Auctions Australia (farmauctions.com.au) every month. Real Yeomans ploughs turn up for $1,800-$2,500. No warranty, but it'll work if it's not rusted through.
That's it. No more excuses. Get the plough, do it right, and your dam won't dry up by February. If you don't, you're just another off-grid bloke with a dry tank. Get on it.
While many off-grid projects are achievable as DIY, certain situations require licensed professionals:
Always check local regulations and obtain necessary permits before commencing work.
Worth a watch: Subsoiling with the Yeomans Plow #KeylineDesign · Our Stoney Creek Journey