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California Polytechnic State University, San Luis Obispo

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Role Of Dissolution And Precipitation Of Minerals In Controlling Soluble Aluminum In Acidic Soils, G. S. P. Ritchie Jan 1994

Role Of Dissolution And Precipitation Of Minerals In Controlling Soluble Aluminum In Acidic Soils, G. S. P. Ritchie

Food Science and Nutrition

No abstract provided.

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Nutrient Uptake And Organic Acid Anion Metabolism In Lupins And Peas Supplied With Nitrate, S. P. Loss, A. D. Robson, G. S.P. Ritchie Jan 1994

Nutrient Uptake And Organic Acid Anion Metabolism In Lupins And Peas Supplied With Nitrate, S. P. Loss, A. D. Robson, G. S.P. Ritchie

Food Science and Nutrition

Unlike many plants reported in the literature, lupins do not excrete OH− in amounts equivalent to the net excess of inorganic anion uptake over inorganic cation uptake. To investigate the mechanisms involved in the maintenance of charge balance, nutrient uptake and organic anion accumulation of lupins and peas supplied with a range of NO3− concentrations, were compared. Lupins absorbed less NO3− than peas on a dry weight basis, which largely ACCOUNTED for the smaller excess of anion uptake over cation uptake in lupins than in peas at the same NO3− supply. When anion uptake exceeded cation uptake, peas excreted an …

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An Optimization Model Of The Dual-Purpose Cattle Production System In The Humid Lowlands Of Venezuela, Charles F. Nicholson, David R. Lee, Richard N. Boisvert, Robert W. Blake, Isabella C. Urbina Jan 1994

An Optimization Model Of The Dual-Purpose Cattle Production System In The Humid Lowlands Of Venezuela, Charles F. Nicholson, David R. Lee, Richard N. Boisvert, Robert W. Blake, Isabella C. Urbina

Agribusiness

We developed a deterministic, multi-period linear programming (LP) model of the dual-purpose (milk-beef) cattle production system in the Sur del Lago region of Venezuela. The LP model selected animal, forage, and purchased feed activities subject to nutritional, land, and herd composition constraints to maximize discounted herd net margin. A cattle nutrition model provided original coefficients for feeds and animal nutrient requirements. Revised coefficients resulted from an iterative procedure to avoid errors from the interaction between diet and requirements. Model applications demonstrated that alternatives to traditional feeding practices are profitable and nutritionally feasible. However, the benefits of alternative nutritional management depend …

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Changes In The Forms Of Cadmium With Time In Some Western Australian Soils, S. S. Mann, G. S.P. Ritchie Jan 1994

Changes In The Forms Of Cadmium With Time In Some Western Australian Soils, S. S. Mann, G. S.P. Ritchie

Food Science and Nutrition

Changes in the forms of Cd with time could affect its uptake by plants and hence potential toxicity to animals and humans. The effect of time on the forms of native and added Cd was studied in four West Australian soils which differed in their clay, hydrous oxide and organic matter content. Sequential extraction of soluble (KCl), exchangeable (BaCl2), bound to organic matter (NaOCl), bound to oxides/clays (ammonium oxalate) and residual (concentrated acids) forms of Cd was carried out at different time intervals after the addition of Cd.
The Cd that was added to the soils transformed with …

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Phosphorus Leaching In Soils Amended With Piggery Effluent Or Lime Residues From Effluent Treatment, D. M. Weaver, G. S.P. Ritchie Jan 1994

Phosphorus Leaching In Soils Amended With Piggery Effluent Or Lime Residues From Effluent Treatment, D. M. Weaver, G. S.P. Ritchie

Food Science and Nutrition

Phosphorus (P) in wastes from piggeries may contribute to the eutrophication of waterways if not disposed of appropriately. Phosphorus leaching, from three soils with different P sorption characteristics (two with low P retention and one with moderate P retention) when treated with piggery effluent (with or without struvite), was investigated using batch and leaching experiments. The leaching of P retained in soil from the application of struvite effluent was determined. In addition, P leaching from lime residues (resulting from the treatment of piggery effluent with lime to remove P) was determined in comparison to superphosphate when applied to the same …

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Phosphorus Removal From Piggery Effluents Of Varying Quality Using Lime And Physico-Chemical Treatment Methods., D. M. Weaver, G. S. P. Ritchie Jan 1994

Phosphorus Removal From Piggery Effluents Of Varying Quality Using Lime And Physico-Chemical Treatment Methods., D. M. Weaver, G. S. P. Ritchie

Food Science and Nutrition

The choice of management practices for the treatment of piggery effluent prior to its disposal to waterways or land is governed by the desire to simultaneously minimise the cost of treatment whilst minimising pollution of the environment. Laboratory experiments were conducted to compare the removal of total and total filterable phosphorus (P) (μm) from ortho-phosphate solutions or piggery effluent by hydrated lime or lime kiln dust alone, or from recycled piggery effluent by lime and physico-chemical treatment methods. In addition, the ability of lime to remove P from recycled piggery effluent at an intensive piggery was assessed.

Most P …

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Amelioration Of Subsurface Acidity In Sandy Soils In Low Rainfall Regions. Ii. Changes To Soil Solution Composition Following The Surface Application Of Gypsum And Lime, C. D. A. Mclay, G. S.P. Ritchie, W. M. Porter, A. Cruse Jan 1994

Amelioration Of Subsurface Acidity In Sandy Soils In Low Rainfall Regions. Ii. Changes To Soil Solution Composition Following The Surface Application Of Gypsum And Lime, C. D. A. Mclay, G. S.P. Ritchie, W. M. Porter, A. Cruse

Food Science and Nutrition

Two field trials were sampled to investigate the changes to soil solution chemical properties of a yellow sand plain soil with an acidic subsoil following the application of gypsum and lime to the soil surface in 1989. The soils were sandy textured and located in a region of low annual rainfall (300-350 mm). Soil was sampled annually to a depth of 1 m and changes in soil solution composition were estimated by extraction of the soil with 0.005 M KCl.
Gypsum leaching caused calcium (Ca), sulfate (SO4) and the ionic strength to increase substantially in both topsoil and …

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Academic Senate - Meeting Minutes, 11/30/1993, Academic Senate Nov 1993

Academic Senate - Meeting Minutes, 11/30/1993, Academic Senate

Academic Senate Minutes

No abstract provided.

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Mass Media Messages, Myths And Martyrs: Analyzing "American Responds To Aids" Public Service Announcements, 1987-1992, Douglas J. Swanson Nov 1993

Mass Media Messages, Myths And Martyrs: Analyzing "American Responds To Aids" Public Service Announcements, 1987-1992, Douglas J. Swanson

Journalism

A brief narrative description of the journal article, document, or resource. Focusing on the federal government's efforts to educate the public to the dangers of Acquired Immune Deficiency Syndrome (AIDS), a study examined "America Responds to AIDS" public service announcements (PSA's) through a traditional rhetorical analysis (PSA characters, plot, pace, tone, and message design). Forty-four English-language television and radio PSA's produced under the "America Responds to AIDS" campaign were examined. Results indicated that the PSA's: (1) support cultural stereotypes of male carriers and female victims; (2) used inexplicit terminology; (3) employed fear appeals; (4) blocked access to helpful information with …

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Academic Senate - Meeting Minutes, 11/16/1993, Academic Senate Nov 1993

Academic Senate - Meeting Minutes, 11/16/1993, Academic Senate

Academic Senate Minutes

No abstract provided.

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Mustang Daily, November 10, 1993 Nov 1993

Mustang Daily, November 10, 1993

Cal Poly Student Newspaper

Student newspaper of California Polytechnic State University, San Luis Obispo, CA.

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Academic Senate - Agenda, 11/9/1993, Academic Senate Nov 1993

Academic Senate - Agenda, 11/9/1993, Academic Senate

Academic Senate Agendas

No abstract provided.

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Mustang Daily, November 8, 1993 Nov 1993

Mustang Daily, November 8, 1993

Cal Poly Student Newspaper

Student newspaper of California Polytechnic State University, San Luis Obispo, CA.

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Mustang Daily, November 5, 1993 Nov 1993

Mustang Daily, November 5, 1993

Cal Poly Student Newspaper

Student newspaper of California Polytechnic State University, San Luis Obispo, CA.

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November 4, 1993 Cal Poly Report, Public Affairs Office Nov 1993

November 4, 1993 Cal Poly Report, Public Affairs Office

Cal Poly Report

No abstract provided.

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Executive Committee - Agenda, 11/2/1993, Academic Senate Nov 1993

Executive Committee - Agenda, 11/2/1993, Academic Senate

Academic Senate Agendas

No abstract provided.

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Mustang Daily, October 22, 1993 Oct 1993

Mustang Daily, October 22, 1993

Cal Poly Student Newspaper

Student newspaper of California Polytechnic State University, San Luis Obispo, CA.

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October 21, 1993 Cal Poly Report, Public Affairs Office Oct 1993

October 21, 1993 Cal Poly Report, Public Affairs Office

Cal Poly Report

No abstract provided.

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October 14, 1993 Cal Poly Report, Public Affairs Office Oct 1993

October 14, 1993 Cal Poly Report, Public Affairs Office

Cal Poly Report

No abstract provided.

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Mustang Daily, October 14, 1993 Oct 1993

Mustang Daily, October 14, 1993

Cal Poly Student Newspaper

Student newspaper of California Polytechnic State University, San Luis Obispo, CA.

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Executive Committee - Agenda, 10/12/1993, Academic Senate Oct 1993

Executive Committee - Agenda, 10/12/1993, Academic Senate

Academic Senate Agendas

No abstract provided.

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Mustang Daily, October 11, 1993 Oct 1993

Mustang Daily, October 11, 1993

Cal Poly Student Newspaper

Student newspaper of California Polytechnic State University, San Luis Obispo, CA.

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Mustang Daily, October 8, 1993 Oct 1993

Mustang Daily, October 8, 1993

Cal Poly Student Newspaper

Student newspaper of California Polytechnic State University, San Luis Obispo, CA.

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Mustang Daily, October 6, 1993 Oct 1993

Mustang Daily, October 6, 1993

Cal Poly Student Newspaper

Student newspaper of California Polytechnic State University, San Luis Obispo, CA.

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Academic Senate - Agenda, 10/5/1993, Academic Senate Oct 1993

Academic Senate - Agenda, 10/5/1993, Academic Senate

Academic Senate Agendas

No abstract provided.

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Mustang Daily, October 4, 1993 Oct 1993

Mustang Daily, October 4, 1993

Cal Poly Student Newspaper

Student newspaper of California Polytechnic State University, San Luis Obispo, CA.

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Effect Of Feed Restriction On Serum Somatotropin, Insulin-Like Growth Factor-I-(Igf-I) And Igf Binding Proteins In Cyclic Heifers Actively Immunized Against Growth Hormone Releasing Factor, Jeffrey D. Armstrong, W. S. Cohick, R. W. Harvey, E. P. Heimer, R. M. Campbell Oct 1993

Effect Of Feed Restriction On Serum Somatotropin, Insulin-Like Growth Factor-I-(Igf-I) And Igf Binding Proteins In Cyclic Heifers Actively Immunized Against Growth Hormone Releasing Factor, Jeffrey D. Armstrong, W. S. Cohick, R. W. Harvey, E. P. Heimer, R. M. Campbell

Office of the President Scholarship

Feed restriction often increases serum somatotropin (ST) and decreases insulin-like growth factor-I (IGF-I) in ruminants; however, the mechanisms responsible for this change in ST and IGF-I are not well defined. We investigated the effects of feed restriction on serum ST, IGF-I, IGF binding proteins (IGFBP), insulin and nonesterified fatty acids (NEFA) in cyclic Angus and Charolais heifers (n=15) previously immunized against growth hormone releasing factor (GRFi) or human serum albumin (HSAi). Cows were fed a concentrate diet ad libitum (AL) or were restricted to 2 kg cotton seed hulls (R) for 4 d. Each heifer received each dietary treatment in …

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Mustang Daily, September 27, 1993 Sep 1993

Mustang Daily, September 27, 1993

Cal Poly Student Newspaper

Student newspaper of California Polytechnic State University, San Luis Obispo, CA.

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Mustang Daily, September 24, 1993 Sep 1993

Mustang Daily, September 24, 1993

Cal Poly Student Newspaper

Student newspaper of California Polytechnic State University, San Luis Obispo, CA.

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Executive Committee - Agenda, 9/21/1993, Academic Senate Sep 1993

Executive Committee - Agenda, 9/21/1993, Academic Senate

Academic Senate Agendas

No abstract provided.

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