Now showing items 31-40 of 441
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Automated analysis of 15N and 14C in biological samples
Contributor:Paul, Eldor A.; Harris, D.
An automated method for the simultaneous analysis of total N, total C, 15N and 14C in small plant and soil samples is described. A commercial C-N analyser - continuous flow isotope ratio mass spectrometer (ANCA-MS) has ...
Effect of moisture, temperature, and nitrogen on yield and protein quality of Thatcher wheat
Contributor:Paul, E. A.; Sosulski, F. W.; Lin, D. M.
Soil moisture level was the most important factor controlling plant and grain yields while nitrogen fertilizer had the greatest influence on protein content and sedimentation value. Lower temperatures and nitrogen fertilization ...
Decomposition of wheat straw and stabilization of microbial products
Contributor:Voroney, R. P.; Anderson, D. W.; Paul, E. A.
This research examined the effects of soil environment on the decomposition of cereal crop residues and stabilization of microbial products in the field. Microplots at semi-arid and subhumid field sites were amended with ...
Design of loading facilities and holding pens
Holding pens and loading facilities are used in abattoirs, saleyards, stockyards, and sorting facilities. Long, narrow pens are recommended where animals enter through one end and leave through the other. Constructing the ...
Organic carbon dynamics in grassland soils. 1. Background information and computer simulation
Contributor:Paul, E. A.; Van Veen, J. A.
The decomposition rates of 14C-labelled plant residues in different parts of the world were characterized and mathematically simulated. The easily decomposable materials, cellulose and hemicellulose, were described as being ...
Teaching principles of behavior and equipment design for handling livestock
A course is described in which students are taught principles of livestock behavior and how an understanding of behavior can facilitate handling. Some of the principles that are covered in the course are livestock senses, ...
Natural nitrogen-15 abundance of soil and plant samples
Contributor:Rennie, D. A.; Johns, L. E.; Paul, E. A.
Nitrogen isotope analysis of total soil N and soil-derived nitrate for nine selected Chernozemic and Luvisolic Ap horizons showed mean δa15N values based on atmospheric abundance of 8.8. Luvisolic soils were characterized ...
Soil resources, microbial activity, and primary production across an agricultural ecosystem
Contributor:Ellis, Boyd G.; Crum, James R.; Paul, Eldor A.; Klug, Michael J.; Klingensmith, Katherine M.; Robertson, G. Philip
The degree to which soil resource availability is linked to patterns of microbial activity and plant productivity within ecosystems has important consequences for our understanding of how ecosystems are structured and for ...
Electro-immobilization versus mechanical restraint in an avoid-avoid choice test for ewes
Contributor:Thurmon, John C.; Windowskii, Tina M.; Curtis, Stanley E.; Grandin, Temple
A Y-maze avoid-avoid choice test was used to elucidate pregnant ewes' relative preference for electro-immobilization as opposed to restraint by a squeeze-tilt table. Choices in successive trials evaluating three commercial ...
Continuous flow isotope ratio mass spectrometry of carbon dioxide trapped as strontium carbonate
Contributor:Paul, Eldor A.; Porter, L. K.; Harris, D.
The isotopic signal provided by differential discrimination against atmospheric carbon dioxide (13CO2) by C3 and C4 plant photosynthetic pathways is being widely used to study the processes of carbon (C) fixation, soil ...