Macdonald College Research Articles

Historical development of subsurface drainage in Quebec from 1850 to 1970

Despite its beginning in the 1850’s and being first in Canada to purchase a tile drainage trencher, subsurface drainage of agricultural lands in Quebec is poorly documented, which the present paper will try to document from 1850 to 1970. In Quebec, Catholic priests and monks played an important role in educating rural communities by establishing French agricultural schools throughout the province. For the English rural communities, Macdonald College (Macdonald Campus of McGill University) played a major role especially in preparing plans, besides promoting the technology. The Quebec Ministry of Agriculture encouraged subsurface drainage early in 1912 but would prefer investing in land clearing and watercourse deepening to establish more farms, from the employment needs created by WWI, the great 1930 depression and WWII. This work mostly completed in the early 1960’s, the Quebec Government would then initiate a major subsurface drainage program, allowing private enterprises to take over shortly after 1967. Although the Ministry changed names several times even after 1967, the term ‘Ministry of Agriculture’ will be used throughout this article. To compare trencher performance, a 15 m average spacing is presumed. This paper is limited to the main events and persons involved, without being able to cover them all.

Macdonald College of McGill University and the Canadian Society of Microbiologists: an interweaved tale.

Macdonald College of McGill University and the Canadian Society of Microbiologists: an interweaved tale.

Dr. James I. Elliot

We regret to announce the passing of Dr. Jim Elliot, Dean Emeritus, on Saturday August 28, 2010, peaceful at his home in Manitock, Ontario, with his loving wife Elizabeth at his side. Jim was born in Toronto, August 21, 1938. He attended the Ontario Agriculture College graduating in 1962 with a BS.A. in Animal Sciences (U of T). He continued his studies in the west receiving an M.Sc. (1965) and a Ph.D. (1969) in Animal Nutrition from the University of Alberta. Jim’s career started as an Assistant Professor in Animal Sciences at Macdonald College, McGill University, but he was soon recruited as a scientist by the Research Branch of Agriculture Canada. From 1972 to 1989 he enjoyed a successful career as a scientist and research manager. Soon his administrative capability was recognised and in addition to other administrative appointments he served as Acting Deputy Director (1983 1984), Acting Director (1986 1987) and Deputy Director (1984 1986, 1988 1989) for the Animal Research Centre, Research Branch. In 1989 Dr. Elliot accepted the position as Dean, Faculty of Agricultural and Food Sciences, University of Manitoba, and served until 1999 followed by one year in the Department of Animal Science prior to his retirement in 2000. Dean Elliot was known as the ‘‘BUILDER DEAN’’ under his guidance the Faculty successfully completed a nearly $14 million fundraising drive that resulted in a New Agriculture Building on the Fort Gary Campus, the construction of the University of Manitoba Carmen and Region Facility and further renovations to the Faculty Buildings. The ‘‘Builder Dean’’ designation referred to more than the physical structures; it reflected his ability to build a strong network of friends of the Faculty through his interaction with industry leaders and alumni; he changed the name of the Faculty of Agriculture to the Faculty of Agricultural and Food Sciences to highlight the importance of food in the Faculty’s mandate, and with his leadership the Faculty completely revised the undergraduate degree program to reflect a more interdisciplinary approach to agriculture education, now offering four B.Sc. degrees in areas of Agriculture, Agroecology, Agribusiness, and Food Science. Dean Elliot was a strong supporter of the societies in which he was a member. As a member of the Canadian Society of Animal Science he served on the Energy Evaluation Committee (1973 1974) as Director (1978 1981), on the Honours and Awards Committee, as Chairman (198

Sir William C. Macdonald: A Biography (review)

Reviewed by: Sir William C. Macdonald: A Biography Terry Crowley (bio) William Fong . Sir William C. Macdonald: A Biography. McGill-Queen's University Press. xx, 316. $34.95 Has Canadian philanthropy changed over the centuries? After the First World War and for many decades it was common to bemoan the parsimony of Canada's plutocracy as the product of an English/Scots/Irish meanness that stood in marked contrast to generous endowments made by the rich in the United States. Such unfavourable comparisons acknowledged ideological differences between the two countries; Americans favoured free enterprise, it was argued, and Canadians, partially in response to the severity of climate, inclined towards collective action based on government initiative. Canadians could not let people starve on the streets in winter. Still, such contrast generally neglected differences in size and relative wealth between the two countries as well as differing tax policies, since writeoffs in the United States were treated more generously. In the thin history of Canadian philanthropy, SirWilliamC. Macdonald of Montreal tobacco fame was usually singled out along with the agricultural-implement Massey family as exceptions to general Canadian niggardliness. Both Macdonald and the Masseys began their major donations in the late nineteenth century when business and commerce reaped the avails of improved transport on land and sea. Technological innovation and a rising North American population increased profits while taxes were imposed not on incomes but on the general populace through tariffs, fees, and excises. The Masseys are much better known than William Macdonald as a result of their prominence in the movie industry and diplomacy, especially since Vincent Massey become Canada's first native-born Canadian governor general in 1952. Prior to this biography by Montreal historianWilliam Fong, SirWilliam Macdonald had been known only to a few through snippets and patches. Commissioned by the Macdonald Stewart Foundation, this first study brings together facets of Macdonald's life into a coherent whole. Born in Prince Edward Island in 1831, William Macdonald lived a long life ending in 1917. Fong's work is based on a wide variety of archival sources hitherto unexplored. Although the background on the man's family origins is so extended that it might deter the undedicated from reading further, the account of Macdonald's business activities and especially his philanthropy adds immeasurably to both our knowledge and understanding. The evidence adduced suggests that William Macdonald hoped - through works such as Macdonald Institute at the Ontario Agricultural College in Guelph and Macdonald College at McGill University - to create a legacy more glorious than the strain left on his temperament by the tobacco business in which he realized such [End Page 593] immense profits. His background in the nineteenth century and experience with both the United Kingdom and the United States imbued him with belief in progress and technological improvement. As someone who never married - living with his mother and sister for a number of years - William Macdonald grew isolated and increasingly irascible as he aged. His major philanthropy expanded greatly after he reached fifty-five years of age. Curt and often cutting with family members who failed to demonstrate the self-discipline he exemplified, Macdonald provided large donations and received acclaim that gave distinction to his life in a manner that he was otherwise unable to obtain. One thus suspects that while philanthropy has changed in certain regards over the centuries, its fundamental grounding in complex psychology and the need for more permanent and pleasing presence beyond the tears of this transitory life has remained the same over time. President Liliane Stewart of the Macdonald Stewart Foundation is to be commended for long supporting this and other worthwhile ventures in the history of Canada. AuthorWilliam Fong has gone on more recently to publish a biography of Montreal philanthropist J.W. Connell, who established the first major foundation in the country. Vehicles for philanthropy may change, the extent of philanthropy may vary with conditions, but the results continue to be seen in socially beneficial ways. Terry Crowley Terry Crowley, Department of History, University of Guelph Copyright © 2010 University of Toronto Press Incorporated

Margaret Newton: Pioneering Cereal Rust Researcher.

Margaret Newton, the daughter of Elizabeth Brown and John Newton, was born on April 20, 1887 in Montreal, Quebec, Canada. Her father had been educated as a chemist in England, and worked as a laborer on the farm of his father-in-law at Plaisance, Quebec. Margaret’s education began in a one-room schoolhouse at North Nation Mills. Her father later moved the family of five children -Margaret, Robert, John, William, and Dorothy (four were to obtain Ph.D. degrees in agriculture) -and his wife (Fig. 1) to Montreal for a higher paying job at a box manufacturing and lumber firm. Margaret finished middle school and completed two years of high school in Montreal. She finished high school in Plaisance after the family returned there to live. After two additional years at a country school, Margaret taught for one year in the same schoolhouse that she had attended in North Nation Mills. Margaret was not yet fully qualified as a teacher, so she studied for two years at the Collegiate Institute in Vankleek Hill, Ontario, and obtained a teaching degree from the Normal School in Toronto. She taught for three years in Lachine, Quebec, and returned to teach for one year at the school in North Nation Mills. During her teaching stints, Margaret became interested in obtaining a university degree. She initially enrolled in an arts program at McMaster University. During her first year at McMaster she visited her brother who was attending Macdonald College, at Ste. Anne de Bellevue, Quebec, which was the faculty of agriculture of McGill University. Margaret decided to change her field of study, and in 1914 applied for admittance to Macdonald College, with a major in agriculture. She was not immediately accepted, although her academic credentials were excellent. The most likely reason for this Margaret Newton (Photo courtesy Agriculture and AgriFood Canada Cereal Research Center, Winnipeg).

Research on podzolization at Macdonald College from 1947 to 1959

I am writing this article in honor of the late Dr. W. A. Delong, Professor of Chemistry, who initiated research on the mechanism of podzolization at Macdonald College in 1947. This research continued unintemrpted for 12 years and contributed in a major way not only to Canadian but also to international soil science. The results ofthis research have significantly influenced several developments in modern soil chemistry. It was Dr. Delong who planned this research, and managed to obtain long-term financial support from the Field Husbandry Division of the Canadian Department of Agriculture (now Agriculture and Agri-Food Canada) in Ottawa, selected graduate students, guided and directed their work, and assisted them with writing theses and scientific papers. Dr. Delong was an outstanding researcher who had an exceptional ability to stimulate and direct students. Graduate students who worked on this project were in chronological order: C. W. Boswall, P. C. Stobbe, B. B. Coldwell, W. P. McKinley, L. E. Lutwick, M. Schnitzer, K. S. Maclean, D. E. Coffin, and R. J. Soper. Results of this research were communicated in six M.Sc. and five Ph.D. theses, and in 11 scientific papers. I have listed the titles of the theses, and the references for the scientific papers at the end of the article. As I worked with Dr. Delong for 5 years (1950-1955), I was able to closely observe hirn as research leader and also became familiar with the various aspects of this project. I believe that this qualifies me to write this article. I will describe the objectives of this research, the experimental setup, the results obtained, and then evaluate the influences of this research on modern soil chemistry. Finally, I will recount a few personal experiences with Dr. Delong which will throw light on his personality. I hope that among the readers of this article will be students and younger soil scientists who are not familiar with research done in this country 3547 years ago, and also those who are interested in the history of soil science, specifically Canadian soil science.

Pharmacokinetic behaviour of netobimin and its metabolites in sheep

The pharmacokinetics and the profile of urine excretion of netobimin (NTB) and its metabolites were investigated after its intraruminal (i.r.) and subcutaneous (s.c.) administration to sheep at 20 mg/kg. Plasma and urine concentrations of NTB, albendazole (ABZ), albendazole sulphoxide (ABZSO) and albendazole sulphone (ABZSO2) were measured serially over a 120-h period by HPLC. NTB showed a similar pharmacokinetic profile in both treatments, being detected between 0.5 and 12 h post-treatment, but the tmax was achieved significantly earlier (P less than 0.05) after s.c. treatment. ABZ was detected in plasma only after i.r. treatment, resulting in a low area under the curve (AUC). The peak plasma concentration (Cmax) and AUC for ABZSO and ABZSO2 were significantly higher after i.r. administration of NTB. In both treatments, the ABZSO Cmax was reached earlier than the ABZSO2 Cmax. The ratio of AUC ABZSO2:ABZSO was higher following s.c. administration (1.33) than following i.r. administration (0.35). The percentages of total dose excreted in the urine as NTB, ABZ, ABZSO and ABZSO2 were 17.05 (i.r.) and 8.16 (s.c.). There was a less efficient conversion of NTB into ABZ metabolites after s.c. administration. The detection of ABZ in plasma and the high ABZSO AUC obtained after i.r. treatment may be of major importance for anthelmintic efficacy.

Food and Its Relation to Interactive Packaging

It is easy to forget that food is a complex chemical matrix, often derived from a previously living system, which is always dynamic chemically and at times physiologically. In order to understand the specialized requirements associated with new processing and packaging technologies, we have to consider the chemistry of the components making up a food system and its associated microbial flora to determine how specialized packaging techniques can protect the food system in question from the changes which will take place over time. This presentation will focus on the substantially more complex situation facing the new interactive packaging technology, which is now emerging and some of the ongoing work in the Department of Food Science at Macdonald College of McGill University.

Agronomic and economic feasibility of growing corn ( Zea mays L.) with different levels of tillage and dairy manure in Quebec

In order to assess the agronomic and economic feasibility of growing corn under reduced tillage using manure as a source of fertilizer, a study of silage and grain corn ( Zea mays L.) production using three levels of tillage (conventional, reduced and zero till) and two types of fertilizer (inorganic fertilizer and dairy manure) was initiated on a clay soil and a sandy loam soil in 1981 at Macdonald College. Results obtained between 1983 and 1986 showed that good yields could be obtained with zero and reduced tillage in combination with inorganic fertilizers. The use of dairy manure in combination with conventional and reduced tillage resulted in good plant yields at the sandy loam site but decreased plant yield at the clay site. The practice of zero till in combination with manure resulted in difficulties with weed control, poor seed emergence and a greater risk of frost damage in the spring. The costs of production were lowest when zero till was used in association with inorganic fertilizers.

Abstracts of papers presented at the annual meeting of the Canadian Phytopathological Society McGill University, Montreal 9-13 July 1988

Abstracts of papers presented at the annual meeting of the Canadian Phytopathological Society McGill University, Montreal 9-13 July 1988

Absence of endogenous viral genes in an inbred line of leghorn chickens selected for high egg production and Marek's disease resistance

Journal of Animal Breeding and GeneticsVolume 106, Issue 1-6 p. 217-224 Absence of endogenous viral genes in an inbred line of leghorn chickens selected for high egg production and Marek's disease resistance J. S. Gavora, Corresponding Author J. S. Gavora Animal Research Centre of Agriculture Canada, Ottawa, Department of Animal Science, Macdonald College of McGill University, Ste. Anne-de-Bellevue, Quebec, Canada and Animal Diseases Research Institute of Agriculture Canada, Nepean Animal Research Centre, Agriculture Canada, Ottawa, Ont. Canada, KIA OC6 Department of Animal Science, MacDonald College of McGill University, Ste. Anne de Bellevue, Que., Canada, H9X ICO Animal Diseases Research Institute, Agriculture Canada, Nepean, Ont. Canada, K2H 9P9.Search for more papers by this authorU. Kuhnlein, Corresponding Author U. Kuhnlein Animal Research Centre of Agriculture Canada, Ottawa, Department of Animal Science, Macdonald College of McGill University, Ste. Anne-de-Bellevue, Quebec, Canada and Animal Diseases Research Institute of Agriculture Canada, Nepean Animal Research Centre, Agriculture Canada, Ottawa, Ont. Canada, KIA OC6 Department of Animal Science, MacDonald College of McGill University, Ste. Anne de Bellevue, Que., Canada, H9X ICO Animal Diseases Research Institute, Agriculture Canada, Nepean, Ont. Canada, K2H 9P9.Search for more papers by this authorJ. L. Spencer, Corresponding Author J. L. Spencer Animal Research Centre of Agriculture Canada, Ottawa, Department of Animal Science, Macdonald College of McGill University, Ste. Anne-de-Bellevue, Quebec, Canada and Animal Diseases Research Institute of Agriculture Canada, Nepean Animal Research Centre, Agriculture Canada, Ottawa, Ont. Canada, KIA OC6 Department of Animal Science, MacDonald College of McGill University, Ste. Anne de Bellevue, Que., Canada, H9X ICO Animal Diseases Research Institute, Agriculture Canada, Nepean, Ont. Canada, K2H 9P9.Search for more papers by this author J. S. Gavora, Corresponding Author J. S. Gavora Animal Research Centre of Agriculture Canada, Ottawa, Department of Animal Science, Macdonald College of McGill University, Ste. Anne-de-Bellevue, Quebec, Canada and Animal Diseases Research Institute of Agriculture Canada, Nepean Animal Research Centre, Agriculture Canada, Ottawa, Ont. Canada, KIA OC6 Department of Animal Science, MacDonald College of McGill University, Ste. Anne de Bellevue, Que., Canada, H9X ICO Animal Diseases Research Institute, Agriculture Canada, Nepean, Ont. Canada, K2H 9P9.Search for more papers by this authorU. Kuhnlein, Corresponding Author U. Kuhnlein Animal Research Centre of Agriculture Canada, Ottawa, Department of Animal Science, Macdonald College of McGill University, Ste. Anne-de-Bellevue, Quebec, Canada and Animal Diseases Research Institute of Agriculture Canada, Nepean Animal Research Centre, Agriculture Canada, Ottawa, Ont. Canada, KIA OC6 Department of Animal Science, MacDonald College of McGill University, Ste. Anne de Bellevue, Que., Canada, H9X ICO Animal Diseases Research Institute, Agriculture Canada, Nepean, Ont. Canada, K2H 9P9.Search for more papers by this authorJ. L. Spencer, Corresponding Author J. L. Spencer Animal Research Centre of Agriculture Canada, Ottawa, Department of Animal Science, Macdonald College of McGill University, Ste. Anne-de-Bellevue, Quebec, Canada and Animal Diseases Research Institute of Agriculture Canada, Nepean Animal Research Centre, Agriculture Canada, Ottawa, Ont. Canada, KIA OC6 Department of Animal Science, MacDonald College of McGill University, Ste. Anne de Bellevue, Que., Canada, H9X ICO Animal Diseases Research Institute, Agriculture Canada, Nepean, Ont. Canada, K2H 9P9.Search for more papers by this author First published: January‐December 1989 https://doi.org/10.1111/j.1439-0388.1989.tb00232.xCitations: 29AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Citing Literature Volume106, Issue1-6January‐December 1989Pages 217-224 RelatedInformation

Abstracts of papers presented at the annual meeting of the Canadian Phytopathological Society University of British Columbia, Vancouver 14-17 August 1988

Abstracts of papers presented at the annual meeting of the Canadian Phytopathological Society University of British Columbia, Vancouver 14-17 August 1988

Partially Characterized Components of the Epicuticle of Dauer Juvenile Steinernema feltiae and Their Influence on Hemocyte Activity in Galleria mellonella

The epicuticle of dauer juveniles of the DD 136 strain of Steinernemafeltiae prevents encapsulation of the nematodes in vivo by hemocytes of Galleria mellonella larvae. The chemical composition of the epicuticle, which provides this protection, was determined using fluorescein isothiocyanate-conjugated lectins (concanavalin A, soybean agglutinin, wheat germ agglutinin) in conjunction with carbohydrases, lipase, and proteases. a-Mannose, 3-N-acetyl-D-galactosamine, and f8-N-acetyl-D-glucosamine were detected on the nematode's epicuticle. The absence of these sugars from enzyme-modified epicuticle did not affect hemocyte attachment. There was no evidence of epicuticular glycoproteins. In general, proteolytic enzymes did not alter the dauer juvenile epicuticle such as to elicit hemocyte-mediated encapsulation. Digestion of the epicuticle of dauer juveniles with lipase rendered the nematodes susceptible to hemocyte-mediated encapsulation. Many entomophilic nematodes live part of their lives in the hemolymph of their insect hosts, where the nematode cuticle is the interface between the nematode and the humoral and cellular components of the hemolymph. The function of the cuticle of these nematodes is incompletely known, but studies have shown that aspects of the transcuticular uptake of nutrients by entomophilic parasitic nematodes (Rutherford and Webster, 1974; Chen and Howells, 1979; Gordon et al., 1982) are related to cuticular structure (Nicholas, 1972; Batson, 1979; Platzer and Platzer, 1985). During the parasitic phase, the cuticle thickness of many entomophilic nematodes decreases (Bailey and Gordon, 1973), and in others, an outer microvillar layer develops (Riding, 1970) and functions as a nutrient absorptive layer. These nematodes encounter humoral (phenol oxidases) and/or cellular (hemocyte-mediated encapsulation) nonself resistance systems in the insect hemolymph (Ratcliffe and Rowley, 1979), but the contribution of the nematode cuticle to either resisting or evading these defenses is unknown, despite the reported occurrence of humoral (Welch and Bronskill, 1962; Andreadis and Hall, 1976) and cellular encapsulation (Nappi, 1975; Ratcliffe and Rowley, 1979). Vinson (1977) proposed that in the absence of active suppression of insect defenses, successful insect Received 5 September 1986; revised 3 December 1986; accepted 5 December 1986. * Present address: Department of Entomology, Macdonald College, McGill University, Ste. Anne de Bellevue, Quebec, Canada H9X 1CO. parasitoids would not be encapsulated due to (1) t e acquisition of a coat of host hemolymph components presenting the nonself agent as self, (2) the possession of heterophilic antigens, (3) the possession ofnonreactive surfaces, or (4) molecular mimicry. Evidence of a protective coat, albeit from insect midgut, may explain the reduction of humoral encapsulation of Brugia pahangi mic ofilariae in mosquitoes (Sutherland et al., 1984; Lafond et al., 1985). Entomophilic nematodes are not known to use molecular mimicry, although it may be used by cestodes and ac nthocephala (Lackie and Lackie, 1979) in some insects. The DD136 strain of Steinernema feltiae evades the hemolymph resistance systems of the gr ater wax moth, Galleria mellonella (Lepidoptera) larvae by avoiding nonself recognition (Dunphy and Webster, 1985), but the means by which this is achieved are unknown. The present study examines some of the epicuticular components of sheathed dauer juvenile S. feltiae DD136, and assesses the contribution of these components in evasion of encapsulation by the nematodes in G. mellonella. MATERIALS AND METHODS

BALDWIN OAT

Baldwin is a white-hulled oat (Avetia sativa L.) cultivar with high yield, high test weight, low hull content and early maturity. It was developed at Macdonald College of McGill University and is adapted to eastern Canada. This cultivar was granted license no. 2563 in November 1985.Key words: Oat, Avena sativa L., high test weight

ADAPTABILITY AND DISEASES OF JERUSALEM ARTICHOKE (Helianthus tuberosus) IN QUEBEC

An early and a midseason cultivar of Jerusalem artichoke (JA) (Helianthus tuberosus) were better adapted than a late cultivar at Macdonald College and L’Acadie, Quebec, and Ottawa, Ontario. Diseases observed on JA were powdery mildew (Erysiphe cichoracearum), Sclerotinia rot (S. sclerotiorum), and apical chlorosis (Pseudomonas syringae pv. tagetis).Key words: Jerusalem artichoke, Helianthus tuberosus, adaptability, powdery mildrew, Sclerotinia rot, apical chlorosis

Proceedings of the 1986 Workshop held at Macdonald College of McGill University Ste. Anne de Bellevue, Quebec May 26 – 28, 1986

Proceedings of the 1986 Workshop held at Macdonald College of McGill University Ste. Anne de Bellevue, Quebec May 26 – 28, 1986

Abstracts of papers presented at the annual meeting of the Canadian Phytopathological Society University of Saskatchewan, Saskatoon 27-30 July 1986

Abstracts of papers presented at the annual meeting of the Canadian Phytopathological Society University of Saskatchewan, Saskatoon 27-30 July 1986

Plant Pathogen Containment (Quarantine) Facility at Macdonald College

Plant Pathogen Containment (Quarantine) Facility at Macdonald College

Haemoproteus tinnunculus in the American kestrel (Falco sparverius).

P. J. Maloney, Department of Entomology, Macdonald College of McGill University, Ste. Anne de Bellevue, Quebec H9X 1CO, Canada; G. F. Bennett, International Reference Centre for Avian Haematozoa, Memorial University of Newfoundland, St. John’s, Newfoundland A1B 3X9, Canada; D. M. Bird, Macdonald Raptor Research Centre, Macdonald College of McGill University, Ste. Anne de Bellevue, Quebec H9X 1CO, Canada; and D. J. Lewis, Department of Entomology, Macdonald College of McGill University, Ste. Anne de Bellevue, Quebec H9X 1CO, Canada

Physico-mechanical properties and yield of silage corn as affected by soil compaction and tillage methods

Experimental investigations were conducted over three years to test the hypothesis that soil compaction affects the physical and mechanical properties of corn ears and corn cobs. Field experiments were made on sub-drained clay and sandy loam soils at Macdonald College Farm in Quebec Province of Canada. The mechanical properties of corn ears and corn cobs were determined from quasi-static force-deformation analysis performed with a universal Instron testing machine. The results showed that soil compaction treatments did not significantly influence corn cob elastic modulus and strength in simple bending nor in radial compression. Cob moisture content did not significantly change as a result of the application of various traffic treatments. However, corn cob diameter and pith diameter were both significantly affected by soil compaction. Corn ear moisture content and bending strength were not significantly affected by soil compaction. However, corn ear yield in all three years was found to be dependent on the amount of soil compaction applied. Also studied were the effects of various tillage methods in ameliorating the deleterious effects of soil compaction on crop yield and crop quality. It is concluded that a judicious choice of tillage machinery system can minimize the reductions in ear yield due to soil compaction.