s:404:"TI Timber-based Agroforestry options for upland farmers on degraded soils in the Philippines: tree growth, Agroforestry systems and farmers' risk 
AU Martin F S 
AB Overall SAFODS Hypothesis."In tree-depleted tropical landscapes with poor soils farming systems purely based on annual food crops are not sustainable, but a transition into tree-based farming is feasible and offers better prospects” 
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