1 Yield data were not requested in the course of the inventory for the following reasons:
- to obtain meaningful and comparable yield data additional questions would have to
be asked and to be answered on spacing, thinning regime and rotation period. This
exceeded the scope of the inventory and was therefore omitted
- some yield indications on a number of species can be obtained from existing data on
plantation yields (only applicable in modified form for farm woodlots)
2 This is the total of all qualitative indications of uses of various kinds including those
which may be ranked as service uses (e.g. mulching, windbreaks, N-fixation) and for
which no quantitative/yield data were requested.
- in general terms the analysis of the accessions/records of the MPTS
Data Base clearly indicates that the level of quantitative knowledge
on the productivity of multipurpose trees and shrubs is far lower
than acceptable in view of the relevance of yield data to the many
aspects of agroforestry research and development, as outlined in the
previous chapters.
Appendices 2, 3 and 4 list those records on species for which food, fodder leaves/
shoots and fodder pods/seeds were indicated as uses of multipurpose trees
and shrubs, and for which, at the same time, yield data were provided. Table 2
on page 9 summarizes yield data of selected species which are represented by
more than one record. For a number of reasons, which will be discussed
hereunder, the mean yields provided in this table have to be treated with
caution. However, they indicate not only the magnitude (or minitude)
of productivity in general, but also some comparative yields for leaf fodder
on the one hand and pods/seeds on the other. These productive figures
matched with the nutritious value of pod versus leaf fodder would be useful
with regard to the decision as to what to focus on in the future development
of the promising species.