Control of Herbicide Sprayers With Soil Organic Matter as an Input (Illinois)
Pitts, Marvin Joseph
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https://hdl.handle.net/2142/70953
Description
Title
Control of Herbicide Sprayers With Soil Organic Matter as an Input (Illinois)
Author(s)
Pitts, Marvin Joseph
Issue Date
1983
Department of Study
Agricultural Engineering
Discipline
Agricultural Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Agricultural
Abstract
A digital control system for agricultural field sprayers was designed using bypass nozzles to minimize changes in spray pattern and drop size. Sprayer travel speed and the organic matter in the soil under the sprayer were the design inputs. Step, impulse and sinusoidal demands on the system were made and the resulting flows observed. A transfer function between bypass pressure and bypass flow was sought.
Sensors to detect soil organic matter content were needed. Two light reflectance soil organic matter sensors were designed and evaluated using 30 typical Illinois soils. One sensor, based on the change in the slopes of the power curve of reflected light at two wavelengths was found ineffective. The other, based on the primary colors, red and green, and on unfiltered light, predicted soil organic matter content.
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