@article {803,
	title = {The scientific basis for Shipibo soil classification and land use: Changes in soil-plant associations with cash cropping},
	journal = {American Anthropologist},
	volume = {91},
	year = {1989},
	month = {March 1989},
	pages = {83-100},
	abstract = {Since the Shipibo began cash cropping rice, their land use patterns have changed with proportionately less utilization of soft sandy soils, which are best for staple Musa production, and greater use of harder clayey soils, which are more suitable for rice and root crops. Statistical analysis of soil samples reveals the physical-chemical basis for Shipibo soil categories and indicates the effect of swidden agriculture on levels of important soil characteristics. While cultural principles for planting have summarized these important ecological relationships in the past, they are often violated with increasing rice production. Examination of time allocation and food consumption data shows that changes in Shipibo land use patterns are associated with higher labor costs during brief periods of the agricultural cycle and greater dependence on domesticated animal foods.},
	keywords = {cultural ecology, human adaptation, Shipibo, soil classification, swiddens},
	doi = {10.1525/aa.1989.91.1.02a00050},
	url = {https://anthrosource.onlinelibrary.wiley.com/doi/abs/10.1525/aa.1989.91.1.02a00050},
	author = {Clifford A. Behrens}
}
@conference {790,
	title = {Relationships between Shipibo and western soil classification: Changes in land use patterns with cash cropping},
	booktitle = {Paper presented at 85th Annual Meeting of the American Anthropological Association, 5 December 1986, Philidelphia},
	year = {1986},
	month = {December 1986},
	abstract = {Since the Shipibo began cash cropping rice, their land use patterns have changed with less utilization of sandy soils, best for staple Mosa production, and greater use of harder soils, more suitable for rice and root crops. Statistical analysis of soil samples reveals the physical-chemical basis for Shipibo soil categories and indicates the effect of swidden agriculture on levels of important soil characteristics. While cultural prescriptions for planting have summarized these ecological relationships in the past, they are often violated with increasing rice production. This paper examines the greater labor costs associated with the adoption of cash cropping by Shipibo farmers. (author)},
	keywords = {cultural ecology, human adaptation, Shipibo, soil classification, swiddens},
	author = {Clifford A. Behrens}
}
