A5111533054- Agronomic Practices and Intercropping Systems
- Soil Carbon and Nitrogen Dynamics
- Agricultural Economics and Policy
- Nitrogen and Sulfur Effects on Brassica
- Crop Yield and Soil Fertility
- Soil and Water Nutrient Dynamics
- Weed Control and Herbicide Applications
- Bioenergy crop production and management
- Plant Micronutrient Interactions and Effects
- Economics of Agriculture and Food Markets
- Wheat and Barley Genetics and Pathology
- Ruminant Nutrition and Digestive Physiology
- Water resources management and optimization
- Legume Nitrogen Fixing Symbiosis
- American Environmental and Regional History
- Agricultural risk and resilience
- Pasture and Agricultural Systems
- Rangeland and Wildlife Management
- Economic and Environmental Valuation
- Agricultural Innovations and Practices
- Phytase and its Applications
- Agriculture Sustainability and Environmental Impact
- Agricultural Science and Fertilization
- Biological Control of Invasive Species
- Agriculture, Plant Science, Crop Management
University of New England
2023
Commonwealth Scientific and Industrial Research Organisation
2023
Agriculture and Food
2023
Agriculture and Agri-Food Canada
2013-2022
Lethbridge Research and Development Centre
2009-2021
University of Georgia
2021
Canterbury Christ Church University
2018
American Association of Family and Consumer Sciences
2014-2017
National Association of Friendship Centres
2016
Lethbridge College
2012-2015
Annual crop production in the Canadian prairies is undergoing significant change. Traditional monoculture cereal cropping systems, which rely on frequent summer‐fallowing and use of mechanical tillage, are being replaced by extended diversified rotations together with conservation tillage (minimum zero‐tillage) practices. This paper reviews findings western empirical studies that have examined economic forces behind these land soil changes. The evidence suggests including oilseed pulse crops...
Annual crop production in the Canadian prairies is undergoing significant change. Traditional monoculture cereal cropping systems, which rely on frequent summer-fallowing and use of mechanical tillage, are being replaced by extended diversified rotations together with conservation tillage (minimum zero-tillage) practices. This paper reviews findings western empirical studies that have examined economic forces behind these land soil changes. The evidence suggests including oilseed pulse crops...
Herbicides are very effective tools to control weeds but there has been an overreliance on their use at the expense of other useful methods weed management. Farmers interested in alternative management concerned about risk adopting such practices with current small profit margins. Research Canadian Prairies found that cropping systems utilize zero tillage, diverse crop rotations, competitive cultivars, higher seed rates, specific fertilizer management, and cover crops can effectively manage...
Abstract In western Canada, canola is traditionally grown in rotation once every 4 years to restrict losses due pests. Recently, growers have begun produce more intensively market opportunities and cultivar improvements. This study was initiated investigate the consequences of intensive production rotations, integrated with currently available disease management practices, including blackleg resistant cultivars fungicides. A replicate split-plot experiment established at Scott Melfort,...
High costs of fertilizer in western Canada have generated interest alternative N sources. Legumes produce through fixation, and may increase soil residual mineralizable N, thus reducing the need for subsequent crops. Hybrid canola ( Brassica napus L.) has a high requirement optimum yield, but knowledge rotational effects legumes on is limited. The objective was to determine legume non‐legume preceding crops yield quality grown following year malting barley Hordeum vulgare after canola. Field...
Production functions to explain regional wheat yields have not been studied extensively in the Canadian prairies. The objective of this study is employ a Just-Pope production function examine relationship between fertilizer inputs, soil quality, biodiversity indicators, cultivars qualifying for Plant Breeders' Rights (PBR), and climatic conditions on mean variance spring yields. Using regional-level data from Manitoba, Canada, model results show nitrogen fertilizer, temporal diversity, PBR...
Harker, K. N., O’Donovan, J. T., Smith, E. G., Johnson, Peng, Willenborg, C. J., Gulden, R. H., Mohr, R., Gill, S. and Grenkow, L. A. 2015. Seed size seeding rate effects on canola emergence, development, yield seed weight. Can. Plant Sci. 95: 1–8. Canola (Brassica napus L.) is the most common dicotyledonous crop in Canada. Here we determine effect of In 2013, direct-seeded experiments were conducted at nine western Canada locations. Four sizes (1000-seed weights ranging from 3.96 to 5.7 g)...
Harker, K. N., O'Donovan, J. T., Turkington, T. K., Blackshaw, R. E., Lupwayi, N. Z., Smith, E. G., Klein-Gebbinck, H., Dosdall, L. M., Hall, Willenborg, C. J., Kutcher, H. R., Malhi, S. S., Vera, L., Gan, Y., Lafond, G. P., May, W. Grant, A. and McLaren, D. 2012. High-yield no-till canola production on the Canadian prairies. Can. Plant Sci. 92: 221–233. Relatively high prices increasing demand for (Brassica napus L.) have prompted growers to produce more cropland. Here we determine if seed...
Harker, K. N., O’Donovan, J. T., Turkington, T. K., Blackshaw, R. E., Lupwayi, N. Z., Smith, E. G., Johnson, Gan, Y., Kutcher, H. R., Dosdall, L. M. and Peng, G. 2015. Canola rotation frequency impacts canola yield associated pest species. Can. Plant Sci. 95: 9–20. (Brassica napus L.) production has been steadily increasing in western Canada. Here we determine the effect of on seed yield, quality From 2008 to 2013, direct-seeded experiments involving continuous all phases wheat (Triticum...
Biodiesel is currently produced in Canada mostly from recycled oils and animal fats. If biodiesel to supply 5% of diesel usage, a government objective, first-time vegetable, likely canola soybean, oil will also be required provide adequate feedstocks. In this review, we estimate the life cycle energy balances for soybean under Canadian conditions. The three broad areas inputs were crop production, extraction, transesterification vegetable into biodiesel. Per unit seed yield, farm production...
Soil organic matter (SOM) is a major driver of key agroecosystem functions. Our objective was to examine the dynamics in whole soil, particulate (POM; >53 μm size), and mineral-associated (MAOM) fractions under varying crop rotations nutrient managements at two long-term experimental sites (Breton Lethbridge). samples were collected from simple (2 yr) complex (5 or 6 5–10 cm depth. We found associations between SOM pools versus microbial community soil aggregation. Compared cropped soils, an...
In western Canada, more money is spent on wild oat herbicides than any other weed species, and resistance to the most widespread issue. A direct-seeded field experiment was conducted from 2010 2014 at eight Canadian sites determine crop life cycle, seeding rate, usage, herbicide rate combination effects management canola yield. Combining 2× rates of early-cut barley silage with winter cereals excluding for 3 5 yr (2011 2013) often led similar density, aboveground biomass, seed density in...
Organic crop production systems are increasingly being adopted by producers in the northern Great Plains. This study evaluated expected net returns and risk of organic rotations, compared to conventional rotations. Field plot data rotations were used determine systems, using four different levels premiums for produce. The was estimated cumulative density functions stochastic dominance. most profitable rotation required high price dominate rotation. However, dominated some that commonly had...
Turkington, T. K., O'Donovan, J. T., Edney, M. J., Juskiw, P. E., McKenzie, R. H., Harker, K. N., Clayton, G. W., Xi, Lafond, P., Irvine, B., Brandt, S., Johnson, E. May, W. and Smith, 2012. Effect of crop residue, nitrogen rate fungicide application on malting barley productivity, quality, foliar disease severity. Can. Plant Sci. 92: 577–588. The productivity quality the cultivar AC Metcalfe leaf severity were evaluated under three residue types [barley (Hordeum vulgare L.), canola...
O'Donovan, J. T., Turkington, T. K., Edney, M. J., Juskiw, P. E., McKenzie, R. H., Harker, K. N., Clayton, G. W., Lafond, P., Grant, C. A., Brandt, S., Johnson, E. May, W. and Smith, 2012. Effect of seeding date rate on malting barley production in western Canada. Can. Plant Sci. 92: 321–330. Barley (Hordeum vulgare L.) growers Canada often have difficulty achieving grade. This is usually due to unfavourable climatic conditions, but sub-optimal agronomic practices may also be a factor. Field...
The rising cost of N in western Canada has created interest alternative sources fertilizer. Legumes have the ability to fix supply for subsequent crops, but knowledge effects legumes on canola or barley is limited. A multi‐location study was conducted from 2009 2011 evaluate economic various preceding crops (P) and rate a P–canola–barley rotation. Six (field pea, lentil, faba bean, canola, wheat, green manure [GRM] legume [faba bean]) were grown factorial combination with five rates (0, 30,...
ABSTRACT Over the last decade, level of competition in Canadian apple industry has been affected by growing competitive pressures from increasing imports and availability other fresh fruits. In response to intensifying competition, introduced new varieties that are more desirable consumers terms eating quality improve growers’ profitability. British Columbia (BC) sales data were employed examine implicit value attributes for apples sold several metropolitan areas western Canada (Vancouver,...
Core Ideas Diversified rotations are more productive and profitable than cereal only rotations. Fallow less continuous cropping in the Northern Plains. Continuous is riskier; however, it preferred when averse to risk. Crop production semiarid Great Plains has historically been limited wheat ( Triticum aestivum L.), with fallow every second or third year. In response current prices new technologies, these systems have replaced reduced frequency of fallowing inclusion oilseed pulse crops...