Call number: LD2668 .T4 1986 B62 / Master of Science / Biological and Agricultural Engineering

Bibliography: leaves 217-225. / xv, 225 leaves : ill. (some col.) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Soil Science, 1994

Bibliography: leaves 217-225.

No-till pasture renovation can increase the quality and forage yield of underproductive pastures. Decreased erosion, lower costs, and less lost grazing time are advantages of no-till renovation compared to conventional renovation. Unwanted vegetation is first controlled with herbicides to decrease competition for introduced orchardgrass. Two field trials were conducted using a split-plot design to compare three seeding methods and two herbicides. An Aerway no-till drill, a Tye double disk drill, and broadcast followed by harrowing were the seeding methods. Paraquat and glyphosate were used to determine herbicide effect on vegetation control. Orchardgrass did not adequately survive at either trial site. However, where some orchardgrass did survive, vegetation control was more important than seeding method. Competition from annual grasses, many germinating after herbicides were applied, was the reason for renovation failure. Herbicide and initial growth for best control. Yield was doubled in the first harvest by the addition of fertilizer. Early spring forage production from poor pastures is usually more than adequate, so the increase from fertilizer is of marginal value unless it is stored for later use. Yield increase did not carry over to the second harvest when it could be better utilized. Later application dates would extend yield increases from certain species if water is available. / Graduation date: 1994

Dissertation (PhD(Agric))--University of Stellenbosch, 2008. / Accompanying CD-ROM in back pocket of thesis. Bibliography. Also available via the Internet.

Thesis (Ph. D.)--Washington State University, December 2009. / Title from PDF title page (viewed on Feb. 8, 2010). "Department of Crop and Soil Sciences." Includes bibliographical references.

Thesis--Auburn University, 2009. / Abstract. Includes bibliographic references (p.139-160).

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An experiment was set up at Alfred College, in Eastern Ontario, to investigate methods of correcting the negative effects of deep compaction of fine textured soils. / The site was divided into two fields of four treatments with three replicates of each. Treatment 1 was control, treatment 2 subsoiled, treatment 3 compacted and treatment 4 compacted then subsoiled. In year 1 barley was sown in both fields, underseeded with alfalfa in Field 1. The following year alfalfa was grown in Field 1 and corn using minimum tillage in field 2. / Measurements included cone penetration resistance, dry bulk density, and crop yields. / It was found that compaction had a significant effect on lowering yields. However, due to the experiment methodology in the measuring of cone penetration resistance and dry bulk density plus a blocking effect in the corn field, the results were inconclusive statistically as to whether the subsoiling in combination with minimum tillage and alfalfa had an effect of decompacting the soil profile.