ield (GJ ha-\ . yr-1 ) Output-input cllcrgy ratio Net to grass ratio (P/Ft) Water requircment (t ha-1 yy-') Energ)' throllghput (ner MJlh) 20-40 <0-10 0.6-1.3 <0-0.
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Giampietro et al. (1997) studied this question.
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