Degree Type


Date of Award


Degree Name

Doctor of Philosophy


Agricultural and Biosystems Engineering


With the increasing recognition of high soil erosion rates, more U.S. farmers are adopting conservation tillage practices every year. Most of the conservation tillage systems require appreciable amounts of crop residue in order to control erosion. One of the problems of these systems is the fact that the residue interferes with the application of agricultural chemicals. Some of these chemicals cannot be used without soil incorporation cannot be easily incorporated without losing some of the soil protecting surface residue;To solve these problems, the corn residue managing machine was designed, constructed and tested. The development of this machine involved an initial design and four subsequent versions. In its final form the machine essentially consisted of picking fingers, an inclined conveyor belt, and a beater;This machine picks up the residue, raises it above the soil surface to 1.04 m above the ground surface, and finally drops it again. This allows all required practices, including planting, fertilizer application, and herbicide incorporation to be done on the soil without losing crop residue cover;Properties of residue that affect its handling were investigated. A system describing residue properties was proposed and examples of typical field data were shown;A dimensional analysis study of the residue managing machine was performed. Relationships between machine picking ability and the independent variables were determined;Field performance testing showed that a maximum of 63 percent of the residue could be collected by this residue managing machine. Performance tests and field observations also showed that the residue managing machine was reliable, easy to operate, and economical.



Digital Repository @ Iowa State University,

Copyright Owner

Mamoun Ibrahim Dawelbeit



Proquest ID


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File Size

195 pages