Harvesting Mesquite Flour at the University of Arizona: A Case Study in Local Innovative Food Production
mesquite pod harvesting
mesquite bean harvesting
local food production
university of arizona green fund
university of arizona office of sustainability
InstructorKeith, Ladd; Iuliano, Joey
MetadataShow full item record
PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the College of Architecture, Planning and Landscape Architecture, and the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Collection InformationThis item is part of the Sustainable Built Environments collection. For more information, contact http://sbe.arizona.edu.
AbstractThe mesquite-harvesting project at the University of Arizona was in practice from 2011-2013. During the development of the project, students, faculty, and staff were engaged in harvesting, designing harvesting methods, milling, baking, researching, and selling mesquite flour at the campus. After discovering a common toxin in mesquite-pods, a strict harvesting method was obtained and followed throughout the seasons. However, because of the high-maintenance process of harvesting, the mesquite-harvesting project at the University of Arizona could not economically sustain on campus, and therefore, had to come to an end. This document explains the process of harvesting, the research of aflatoxin, best practices, and other events that happened during the UA mesquite-harvesting project.
DescriptionSustainable Built Environments Senior Capstone
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Integrated Grazing and Prescribed Fire Restoration Strategies in a Mesquite Savanna: II. Fire Behavior and Mesquite Landscape Cover ResponsesAnsley, R. J.; Pinchak, W. E.; Teague, W. R.; Kramp, B. A.; Jones, D. L.; Barnett, K. (Society for Range Management, 2010-05-01)Prescribed fire is used to reduce the rate of woody plant encroachment in grassland ecosystems. However, fire is challenging to apply in continuously grazed pastures because of the difficulty in accumulating sufficient herbaceous fine fuel for fire. We evaluated the potential of rotationally grazing cattle in fenced paddocks as a means to defer grazing in selected paddocks to provide fine fuel for burning. Canopy cover changes from 1995 to 2000 of the dominant woody plant, honey mesquite (Prosopis glandulosa Torr.), were compared in three landscape-scale grazing and mesquite treatment restoration strategies: 4-paddock, 1- herd with fire (4:1F), 8-paddock, 1-herd with fire (8:1F), and 4:1 with fire or aerial application of 0.28 kg ha-1 clopyralid + 0.28 kg ha-1 triclopyr herbicide (4:1F/H), and a continuously grazed control with mesquite untreated (CU). Prescribed burning took place in late winter (February-March). Droughts limited burning during the 5-yr period to half the paddocks in the 4:1F and 8:1F strategies, and one paddock in each 4:1F/H strategy. Mesquite cover was measured using digitized aerial images in 1995 (pretreatment) and 2000. Mesquite cover was reduced in all paddocks that received prescribed fire, independent of grazing strategy. Net change in mesquite cover in each strategy, scaled to account for soil types and paddock sizes, was +34%, +15%, +5%, and 241% in the CU, 4:1F, 8:1F, and 4:1F/H strategies, respectively. Thus, rotational grazing and fire strategies slowed the rate of mesquite cover increase but did not reduce it. Fire was more effective in the 8:1F than the 4:1F strategy during drought because a smaller portion of the total management area (12.5% vs. 25%) could be isolated to accumulate fine fuel for fire. Herbaceous fine fuel and relative humidity were the most important factors in determining mesquite top-kill by fire.
Botanical Composition of Steer Diets on Mesquite and Mesquite-Free Desert GrasslandGalt, H. D.; Theurer, B.; Martin, S. C. (Society for Range Management, 1982-05-01)Botanical composition of cattle diets on mesquite and mesquite-free desert rangeland was determined on a weight basis by a microscope point technique and density constants of species. Pastures consisted primarily of grasses, small amounts of forbs and shrubs, and velvet mesquite (17% crown canopy) on one unit. Dietary composition of plant groups consisted of 67 to 97% grasses, 0 to 4% forbs, and trace to 33% shrubs. Species composition of diets varied by seasons and among animals. Plant preference was not necessarily related to plant availability. Composition of diets was markedly different from composition of pastures. Black grama averaged only 3% of diets, but comprised about one-third of herbage production. Arizona cottontop, which averaged 20% of herbage on pastures, was the most consistently selected species, averaging 34% of the diet. Seasonal preference was shown for certain grasses such as rothrock grama in spring and bush muhly in winter. Highest preference for shrub species was shown in winter and early summer. Overall dietary composition between pastures was much the same, but average herbage production for a 2-year period was 347 kg/ha greater where mesquite had been controlled. Leaves comprised the major plant part of steer diets on both pastures. Leaf content of diets increased from winter to summer while stems decreased for the same periods. Botanical composition of animal diets can be a guide to more efficient use of the range resource by grazing animals.