-- Multiple products from different components require production
tradeoffs which may not be easy to evaluate.
- - A wide variation in management practices exists, especially for trees. In
addition, management objectives may change over time to favour certain
products or services over others.
- - A general lack of scientific information about multi-purpose trees, seed
provenances and genetic variability introduces additional sources of
error and levels of uncertainty when evaluating agroforestry technologies.