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Title:Control of Herbicide Sprayers With Soil Organic Matter as an Input (Illinois)
Author(s):Pitts, Marvin Joseph
Department / Program:Agricultural Engineering
Discipline:Agricultural Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(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.
Issue Date:1983
Type:Text
Description:188 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1983.
URI:http://hdl.handle.net/2142/70953
Other Identifier(s):(UMI)AAI8410022
Date Available in IDEALS:2014-12-16
Date Deposited:1983


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