 This form of agriculture requires not only intense physical labor but also requires a knowledge of not only the land, but various types of ground cover, shades and temperatures of local soils, as well as cloud formations to time careful burning .When the Kayapớ manage their agricultural plots they must work with a variety of interacting factors including the background soil fertility, the heterogeneous quality of ash and its distribution, crop nutrient requirements, cropping cycles, management requirements, and pest and disease control clearly illustrating the common misconception that this form of agriculture is primitive and ineffiecnet (Posey 2002).It has often been thought that the slash-burn plots are abandoned after one or two years because of un productive soil, but this is a common misconception.