Soil organic matter changes resulting from tillage and biomass production

A portable tree platform has a base plate which is hinged at the center. Two wooden portions are mounted on top of the base plate, one on either side of the hinge. Each wooden portion has a V-shape at the end remote from the hinge. The base plate terminates coextensively with the wooden portion except for an impaling portion at the center of each V-shaped end. In use, the platform is positioned in a fork of a tree with the impaling portions contiguous to the tree and with the hinged middle at a higher level. Forcing the middle downwardly forces the impaling portions into the tree and the V-shaped ends against opposite sides of the fork.