what does mg ha mean??
M stands for Mega (million), g is for gramme (or gram), and ha is for hectare. The â1 part is the equivalent of âperâ. Therefore Mg ha-1 means megagrammes per hectare, to simplify matters, a magagramme is the same as a tonne. A hectare is the same as an area of 10,000 square metres. Mg ha-1 = One tonne per hectare , the same as 100 grammes per square metre (or in old money 4 ounces per square yard).