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Abstracts

Agriculture Department, University of Guelph, may influence the adaptability of canopy were assessed following four interrow (3 m)
50 Stone Rd E, Guelph, ON N1G 2W1, Canada. management strategies The ob ective of this management strategies 1) cultivation; 2) cover
study was to quantify the ability of agronomic cropping using an annual grass mixture (Lo­
Phosphorus (P) is an essential macronutrient practices to modify the canopy and lodging lium multiflorum Lamarck Avena sativa L ); 3)
in crop production and in past decades risk and to determine how these practices cover cropping using a perennial grass mixture
there has been heavy P fertiliZer application influence N use and final grain N Field trials (Poa pratensis L Lolium perenne L Lolium
to Ontario soils The subsequent P build­ in southern Manitoba evaluated three plant multiflorum Lamarck Festuca rubra L ); and
up in soils creates a scenario where many densities split N fertiliZer application and a 4) a weedy control A 1 m wide strip under the
agroecosystems partake in or are at risk of chlormequat chloride (CCC) application on ca­ vine row was clean cultivated in all treatments
contributing to P pollution of water systems nopy siZe (dry matter and height at anthesis) and all vegetated treatments (i e 2 3 4) were
Breeding important crops like winter wheat N uptake and remobiliZation (Rm) lodging regularly mowed Measurements included
(Triticum aestivum L ) for better P use eficienc y risk grain yield protein and N content on the weeds and intercrop density cover and bio­
(PUE) is a necessar y strategy to addressing cultivar AAC Brandon Low plant density split mass (including roots) soil aggregate stability
this issue in Ontario However there has been N and CCC applications all showed potential and gravimetric water content vine pruning
little success to date The purpose of this to reduce lodging risk without reducing grain weight biomass leaf area and yield Cultiva­
study was to screen winter wheat genotypes yield or protein Additionally PGR and split N tion was the most eficient strategy to control
for their response to P through field traits and applications increased final grain N content by weeds and weed populations increased in
to evaluate the consistency of the P response 3 and 14 kg N ha respectively Correlations both cover crop mixtures afer the first year in
­1
across traits and environments To achieve between dr y matter at anthesis and N uptake comparison Cover crop management also im­
this a 200­line winter wheat diversity panel at anthesis (r=0 80) and N uptake at anthesis pacted weed population composition Cover
was grown under applied P (100 kg/ha MAP) and N Rm (r=0 92) during grain fill were high crops contributed to preser ve the integrity of
and no P applied (0 kg/ha MAP) conditions Grain N content wasn't limited by canopy soil structure because mean weight diameter
and phenotyped for winter sur vival and management practices in this experiment (average siZe of water stable aggregates) was
recover y traits phenological traits and grain likely due to suficient post­anthesis N uptake greater in vegetated treatments compared to
yield Traits that revealed a clear P response compensating for reduced N Rm Therefore cultivation Finally cover crops did not reduce
were used to categoriZe genotypes for PUE canopy management practices have potential yield at har vest
The yield P response could not be predicted in western Canada to reduce lodging risk wi­
with the P response from other traits which is thout compromising grain N levels Additional 123. Wood ash and paper sludge: Po­
indicative of the numerous strategies acting at testing will be required for additional cultivars tential liming and nutrient sources for
variable developmental stages that contribute and growing regions podzolic soils
to a plant's PUE Furthermore the P response B JAVED Y KATANDA R THOMAS L GAL AGE­
was not consistent across environments poin­ 122. Grass cover crops during vineyard DARA X GUO M M FARHAIN T WICKREMA­
ting to the importance of multi­environment establishment in southern Quebec: Their SINGHE AND M CHEEMA School of Science
trials to identify stable genotypes for PUE With effects on weed control and soil aggregate and the Environment, Memorial University, 20
these findings we also present a method for stability to water University, Corner Brook, NL, A2H 5G4, Canada;
screening genotypes for PUE that is practical A K MINVILLE M J SIMARD O CARISSE AND (X.G.) Department of Fisheries, Forestry and
for field testing in regions with historically high C HALDE Department of Plant Sciences, Laval Agriculture, Government of Newfoundland and
P inputs University, Quebec City, QC G1V 0A6, Canada; Labrador, Corner Brook, NL, A2H 6J8, Canada.
and (O.C., M.J.S.) Saint-Jean-sur-Richelieu
121. Canopy management: the balance Research and Development Centre, Agriculture Canadian paper industry produces a signi­
between lodging risk and nitrogen use in and Agri-Food Canada, 430 Boulevard Gouin, ficant amount of wood ash (WA) and paper
western Canadian spring wheat produc­ Saint-Jean-sur-Richelieu, QC J3B 3E6, Canada sludge (SL) as waste products each year
tion Contemporarily these wastes are disposed
A MANGIN A BR�L(­BABEL AND Y LAWLEY Although cover crops can be competitive of at landfill cites causes financial and
Department of Plant Science, University of Ma­ against weeds and improve soil health their environmental implications An alternative to
nitoba, 222 Agriculture Building, 66 Dafoe Road, implementation at the northern limit of grape­ landfilling could be recycling and reusing mill
Winnipeg, MB, R3T 2N2, Canada. vine production is relatively uncommon and waste as soil amendments that might increase
poorly documented In such areas vines have soil pH and provide essential nutrients The
Lodging risk has increased with the introduc­ to be covered by soil (hilling ) or geotextiles ob ective of this study was to evaluate WA SL
tion of new high yielding wheat cultivars with to be protected from frost during winter A alone and in combination with biochar (BC)
increased nitrogen (N) fertility requirements three­year (2018­2020) randomiZed complete as liming and nutrient source to increase soil
Agronomic management of the crop canopy block design experiment was conducted at pH crop growth and yield in podZolic soil We
has been used to reduce lodging risk Howe­ Agriculture and Agri­Food Canada's (AAFC) have conducted a greenhouse experiments
ver the short growing season and unpredic­ research farm in Frelighsburg QC Weed con­ at Wooddale Provincial Tree Nurser y Grand
table moisture supply in western Canada trol aggregate stability and vine productivity Falls­Windsor Newfoundland Experimental

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