Chapter 2 – Historical development
9
Although yields may vary with many agro-environmental factors,
they provide
an extremely useful dataset of objective measurements that form the basis of many
agricultural, environmental and food security policies. It is therefore not surprising
that there are so many world-wide databases on yield and yield estimates (FAO, FSS
Eurostat; and FAO, MARS; see Annex 2). Yields may be estimated by reference to
yields on benchmark soils or may be predicted using crop models.
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