The Adaptive Contour Access Path (ACAP) approach to enable access and enhance polyculture crop production on a steep hill in a tropical humid climate. ACAP Agroforestry Enhancing Biodiversity. Bamboo, Vetiver grass and permanent producing tropical fruit trees, shrubs and herbs as well as endemic flowers. We have planted about 18 different plants – most of them for food production. Enhancing the microorganism and mycorrhiza of the soil.