Show simple item record

dc.contributor.advisorSchoenau, Jeff J.en_US
dc.contributor.advisorGrevers, Mikeen_US
dc.creatorEwen, Bretten_US
dc.date.accessioned2015-04-07T12:00:11Z
dc.date.available2015-04-07T12:00:11Z
dc.date.created2015-03en_US
dc.date.issued2015-04-06en_US
dc.date.submittedMarch 2015en_US
dc.identifier.urihttp://hdl.handle.net/10388/ETD-2015-03-1973en_US
dc.description.abstractLimitations on water infiltration and soil aeration through compaction processes have the potential to limit production in irrigated agricultural fields. This project was conducted to determine the impact of sub-soiling with a paraplow (Howard Rotavator) on soil physical properties and processes that are important in affecting soil-water relations and productivity. The paraplow was the subsoiler selected for use in this study because of its ability to loosen the soil at the depth of plowing while producing minimal surface disturbance. The research plots were located on Chernozem and Vertisol soils in the Brown soil zone in the Lake Diefenbaker irrigation district near Birsay, SK. Irrigated and dryland sites were used for comparison. Sub-soiling was able to consistently reduce bulk density of the soil and effects persisted for one to two years under normal precipitation conditions. Excessively wet conditions (2010 and 2011) reduced the effectiveness of the sub-soiling. Tillage induced porosity in the soil was associated with a greater infiltration capacity measured in the field. Yield benefits in crops grown (canola, flax, wheat) from sub-soiling were variable under the wet conditions of 2010 and 2011. A greater benefit was observed under the normal precipitation conditions of 2012 on sites that were paraplowed in 2011. Subsoiling at a depth of 45cm and a row spacing of 45cm (manufacturer’s recommended configuration) was more effective than shallower depth and wider row spacing treatments. A significant yield benefit was only observed at the dryland site established in 2011, and limited yield benefit was observed in the irrigated sites. Over the three years of the study, annual yields from sub-soiling were on average about 5% higher than the un-tilled control. However, yield benefits were variable depending on crop and year. Given an estimated cost of subsoiling of ~$30 per acre, a benefit of sub-soiling that lasts one year would produce close to break-even conditions, and sub-soiling benefits that are consistent and last longer than one year are needed to be cost effective.en_US
dc.language.isoengen_US
dc.subjectSoil Scienceen_US
dc.subjectTillageen_US
dc.subjectsubsoilingen_US
dc.subjectparaplowen_US
dc.subjectagricultureen_US
dc.subjectbulk densityen_US
dc.titleEffect of paraplowing on soil properties and crop yield under irrigated managementen_US
thesis.degree.departmentAgricultural and Bioresource Engineeringen_US
thesis.degree.disciplineSoil Scienceen_US
thesis.degree.grantorUniversity of Saskatchewanen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Science (M.Sc.)en_US
dc.type.materialtexten_US
dc.type.genreThesisen_US
dc.contributor.committeeMemberSi, Bing C.en_US
dc.contributor.committeeMemberBedard-Haughn, Angela K.en_US
dc.contributor.committeeMemberTollefson, Terryen_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record