A soil has a thin, humus-rich top horizon of depth 5 cm and bulk density 1.4 g/cm^ 4 The sub-soil has less humus and an average bulk density of 1.7 g/cm^ 7 . What is the mass of the plough layer of 0.5 hectare of this land (in metric tonnes)? (Note: plough layer depth=20 cm) .
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