The soil structure stiffness and the index of looseness concepts were developed from the theoretical stress and strain parameters with the aim to establish the tillage mechanics evaluations of the influence of tillage geometry on soil behaviour. / In order to verify these concepts in the field, chisel tines of different blade widths and rake angles were constructed and operated at different depths of tillage in a clay loam and a sandy loam. / Field and laboratory tests were conducted to determine the shear strength parameters, the structural stiffness, the index of looseness, the dry density, the cumulative infiltration, the moisture characteristics, the mean weight diameter and the percentage aggregation developed in the tilled soil. / Polynomial regression equations that related the tillage geometry to the different measured structural behaviours were developed from the test results. / The structural stiffness and the index of looseness were significantly more sensitive than the other measured structural behaviours to the changes in the geometry of a tillage implement.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.77128 |
| Date | January 1982 |
| Creators | Ijioma, Chibueze Ibegbu |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Doctor of Philosophy (Department of Agricultural Chemistry) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 000597014, proquestno: AAINK57989, Theses scanned by UMI/ProQuest. |
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