I would also like to know the suggested length of the canopy trees and the measurements of this 'partial shade'. (a third variable that I would like to know is what type of cacao they experimented with since there are different kinds).

These three aspects are important for the following reasons:

1. The researchers may have studied only 2 rainforests in which case their research is insignificant. The rainforests may have had conditions that may have supported the researcher's conclusions -- we need a diversity of rainforests that contain different conditions in order to more reliably test hypothesis. The researchers may have conducted their research in an ad hoc manner or with certain shortfalls that would invalidate their conclusions. A scientific study needs to be both reliable and valid (in both external and internal way) to be accepted. Certain conditions for both elements need to be addressed. I would like...
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