English translation: ppm-dry weight or mg/kg dry weight
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Was about to select Bourth's answer, as he always goes that extra mile, but decided that this answer pretty much says it. All answers very helpful and thanks to all contributors 4 KudoZ points were awarded for this answer
Explanation: Could it be that rather than weighing a sample of earth and treating it with so much product per kg weighed, they are instead determining the future total "earth plus chemicals" and dosing so that the chemicals represent so much of that total (poids brut)?
It's like dosing petrol for your two-stroke mower. When they say add 4% oil, is it 40mils of oil (4% of one litre) or 41.6 mils (4% of 1.04 litres) that you should add, or does it make b. all difference?
xxxBourth Local time: 00:36 Specializes in field Native speaker of: English PRO pts in category: 227