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A Comparison of Grassland Management Systems for Beef Cattle Using Self-Contained Farmlets: Effects of Contrasting Nitrogen Inputs and Management Strategies on the Farm Economy AgEcon
Laws, J.A.; Williams, Robert J.; Pain, B.F..
The financial implications of manipulating nitrogen (N) inputs and management strategies for beef production systems were assessed. One-hectare grassland farmlets were grazed to a target sward height by beef steers; herbage surplus to grazing requirements was cut for silage. Three systems were compared: ‘CN’, conventional mineral N application to a grass monoculture and broadcast slurry; ‘TN’, tactical mineral N application at fortnightly intervals to a grass monoculture with slurry injection and the early housing of cattle; ‘GC’, a mixed grass/white clover sward with no mineral N addition and slurry injection. Comparisons were made on two contrasting soil types: a freely-draining sandy loam (site 1) and a poorly drained clay (site 2). Financial budgets...
Tipo: Conference Paper or Presentation Palavras-chave: Farmlets; Systems; Beef cattle; Nitrogen; Slurry; Animal production; Economics; UK; Farm Management.
Ano: 2002 URL: http://purl.umn.edu/6962
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A Comparison of Response Surface and Factorial Designs in Agricultural Research AgEcon
Williams, Robert J.; Baker, J.R..
The use of response surface designs in preference to factorial designs in agriculture has become widely discussed and recommended. This paper simulates data for comparable response surface and factorial designs and uses this to demonstrate the similarities between the designs and their analyses and at the same time to point out some of the customary differences in their analyses. More particularly, it aims to show: (a) that for any design a reduction in the number of plots sown reduces the reliability of the results, and (b) that both a response surface design and a factorial design allow the calculation of estimated equations of response surfaces.
Tipo: Journal Article Palavras-chave: Research and Development/Tech Change/Emerging Technologies.
Ano: 1968 URL: http://purl.umn.edu/9206
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A Comparison of Response Surface and Factorial Designs in Agricultural Research: Reply AgEcon
Williams, Robert J.; Baker, J.R..
Tipo: Journal Article Palavras-chave: Research and Development/Tech Change/Emerging Technologies.
Ano: 1969 URL: http://purl.umn.edu/8658
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