forage cover crops: impacts on nutrition, soil, and ecosystem services … · 2019-04-24 ·...
TRANSCRIPT
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Forage cover crops: impacts on nutrition, soil, and ecosystem services
Jillian Bainard & Luke BainardSwift Current Research and Development Centre
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Forage Cover Crops: What are they?• Cover crops are grown to
improve ecosystem and soil health; often ploughed down
• Using annual forages, these crops can be grazed or harvested for feed
• Many perceived benefits:• Improved soil/water relations• Improved soil fertility • Pest management• Etc.
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• Forage Polycultures (Funded by the Agriculture Development Fund (ADF): Schellenberg, Lamb, Ren)
• Winter Polycultures (Funded by ADF: Schellenberg, LaForge)
• Cover Crop spacing for weed control (Funded by ADF: Lamb, Schellenberg)
• Swath grazing forage polycrops (ADF: Lardner & Iwaasa)
• Nitrogen and residue management of forage polycultures (Saskatchewan Cattlemen’s Association (SCA) and SWFA: Bainard, et al.)
• Soil microbial ecology in forage cover crops (Funded by the Manitoba Beef and Forage Initiative (MBFI): Luke Bainard)
Forage Cover Crops: Previous and ongoing research
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MBFI Project Design• Sites: Brookdale Research Farm (near Brandon MB)
South Farm, SCRDC (Swift Current SK)
• Four cropping treatments: 1, 3, 6, 9 species(Oats, peas, Graza forage radish, Italian Ryegrass, hairy vetch, Winfred brassica, sorghum, crimson clover, Hunter brassica)
• Half of each Brookdale plot was grazed in October 2016
• Conditions: 2016 very wet (delayed seeding in Brookdale), 2017 very dry
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Swift Current 2016 Swift Current 2017
Biomass Productivity: Swift Current• By the end of the growing season, productivity of mixtures was similar to
the oat monoculture
July August
kg/h
a
kg/h
a
July August
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kg/h
a
July AugustJuly August
kg/h
a
Brookdale 2016 Brookdale 2017
Biomass Productivity: Brookdale• Oat monoculture consistently produced more biomass than the mixtures • Grazing did not affect the productivity of the following year
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no effect
no effect
no effect
no effect
Cu
Fe
TKN
TP
TK
ADF
NDF
Ca
no effect
Forage Nutrition
MIXTURES• Mixtures had a significant effect on various aspects of forage nutrition (compared to the oat monoculture)
• Grazing had a minimal effect on the nutrition of the crop the following year
GRAZING
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Protein NDF
July August July August
Forage Nutrition• Mixtures had higher protein (TKN) and lower fibre (NDF)• Swift Current shown (similar in Brookdale)
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MIXTURES GRAZING
no effect
Total N
NO3-N
PO4-P
SO4-S
Enzyme activity
Organic C no effect
no effectno effect
no effect
no effectno effect
no effect
no effectno effect
Soil Chemical Properties• Mixtures had a
minimal effect on soil chemical properties
• Grazing had no significant effect on soil chemistry the following year
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MIXTURES GRAZING
Bacteriadiversitycomposition
no effect
Fungidiversitycompositionpathotrophssymbiotrophssaprotrophs
no effect no effect
no effect
(one site)
no effect
no effect
no effect
no effect
no effect
shift shift
Soil Microbial Communities• Fungal community
composition was different under mixtures than monoculture
• Grazed plots had lower bacterial diversity and higher fungal diversity the following year
significance?
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• Productivity: Depending on the location, the productivity of the mixtures used in this study were equal to or slightly less than the oat monoculture
• Nutrition: forage nutrition value was higher in the mixtures (lower fibre and higher protein)
SUMMARY
• Mixtures responded similarly to the oat monoculture under stressful conditions (drought and nutrients)
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• Soil chemical properties: no clear short term benefits, but this may be more evident over longer time frames
SUMMARY
• Soil biological communities: early indications show that the fungal community is impacted by mixtures and by grazing
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SUMMARY• Don’t forget:
• Species selection is important, seeding rate and date is important • Caution when grazing brassicas
• New work: • Fertility and residue management• More grazing trials
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Thank you! Questions?
Acknowledgements:
• AAFC staff and students• MBFI staff