Preliminary soil survey report for the Beni Magdoul and El Hammami areas

March 1979.CER78-79 EVR72.Includes bibliographical references.Prepared under support of United States Agency for International Development, Contract AID/NE-C-1351

Statistical Mechanics of Dictionary Learning

Finding a basis matrix (dictionary) by which objective signals are represented sparsely is of major relevance in various scientific and technological fields. We consider a problem to learn a dictionary from a set of training signals. We employ techniques of statistical mechanics of disordered systems to evaluate the size of the training set necessary to typically succeed in the dictionary learning. The results indicate that the necessary size is much smaller than previously estimated, which theoretically supports and/or encourages the use of dictionary learning in practical situations.Comment: 6 pages, 4 figure

Oils for control of weeds on ditchbanks

Press bulletin containing information on experiments to determine the effectiveness of various types of oils as herbicides

Evaluating Forage Quality of Pastures

Ten irrigated pastures located in northeastern Colorado were evaluated for forage quality during the 1972 growing season. Most of the pastures used the center-pivot type of sprinkler system and consisted mainly of mixtures of alfalfa (Medicago sativa L.), orchardgrass (Dactylis glomerata L.), and smooth bromegrass (Bromus inermis Leyss.) in varying proportions. Thirteen factors for quality were evaluated from each pasture from samples obtained over a 5-month period Mg, P, K, crude protein, in vitro digestibility, cell wall constituents, cell contents, hemicellulose, cellulose, lignin, and silica showed significant fluctuations during the growing season, while calcium and ash insoluble in neutral detergent remained fairly constant. Changes that occurred during the growing season could be accounted for by time of harvest, management practices, species, and other environmental factors such as differences in climate and soil. In spite of differences between pastures, satisfactory regression functions were developed to give good estimations of forage quality using in vitro dry matter digestibility as the dependent variable. By submitting the data to the stepwise regression calculation techniques, good predictive equations for IVDMD were developed that can readily be applied to pastures in northeastern Colorado regardless of location, management, or species composition.This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries.The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact [email protected] for further information.Migrated from OJS platform August 202

Forage Quality of Colorado Pastures

Irrigated pastures located throughout Colorado were evaluated for quality during the 1974 and 1975 growing seasons. The locations represent the diverse climatic and soil conditions found throughout the state. Twelve chemical components were evaluated from each pasture sample obtained over a 5-month period for both years. The relationships of the various chemical components to each other, to time of sampling, and in particular to in vitro digestible dry matter (IVDDM) were determined. Crude protein, neutral detergent fiber, acid detergent fiber, hemicellulose, cellulose, lignin, silica, IVDDM, calcium, and magnesium showed significant changes during the growing seasons of both years while phosphorus and potassium did not. Acid detergent fiber and silica were shown to have significant positive correlation with time of sampling while crude protein and IVDDM had significant negative correlations during both growing seasons. The best predicators of IVDDM in regression analyses were acid detergent fiber, time of sampling, and hemicellulose. The acid detergent fiber concentration accounted for 60% of the variation in digestibility. The time of sampling and the percentages of acid detergent fiber and hemicellulose provided a reliable estimate of digestibility of irrigated pastures in Colorado.This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries.The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact [email protected] for further information.Migrated from OJS platform August 202