Abstract
Intensive hog production is expanding into semi-arid regions of Alberta, where perennial forage lands are increasingly targeted for manure applicati on despite limited guidelines for its efficient use. Herbage yield and crude protein were assessed over two consecutive years within two native rangelands and two tame pastures, following different rates (10, 20, 40, 80 and 160 kg ha -1 NH 4 -N), methods (surface banding vs. subsurface injection) and seasons (fall vs. spring) of one-time liquid hog manure (LHM) application. Increasing manure rates improved grass yield across all sites the first growing season after treatment, from 1626 to 3576 kg ha -1 . Although absolute increases in production were greatest on tame pasture, relative yield increases were similar among sites. Average crude protein (CP) concentration also increased from 69 to 91 g kg -1 in the first year. Despite low rainfall and the absence of a yield response in the second year, grass CP and crude protein yield (CPY) were maximized with increased manure application, highlighting the positive effects of manure on forage production, even with drought. Forb yields demonstrated variable effects among sites, with increasing manure decreasing alfalfa and increasing native forbs. Overall, both semi-arid tame pastures and native rangelands responded positively to LHM application, highlighting the complementary nature of hog and forage production under these conditions. Key words: Crude protein yield, forage, hog manure, injection, native rangeland, precipitation
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Claims 9
Claim · model-written summary
Increasing manure rates increased grass yield from 1626 to 3576 kg ha -1 in the first growing season.
- Taxon
- grasse0
- Treatment
- Increasing manure ratese0
- Outcome
- grass yielde0
- Direction
- improvede0
- Value
- 1626 to 3576 kg ha -1e0
- Qualifier
- the first growing season after treatmente0
Not reportedComparator
Verbatim
e0“Increasing manure rates improved grass yield across all sites the first growing season after treatment, from 1626 to 3576 kg ha -1”
Claim · model-written summary
Absolute production increases were greatest on tame pasture.
Verbatim
e0“absolute increases in production were greatest on tame pasture”
Claim · model-written summary
Relative yield increases were similar among sites.
Verbatim
e0“relative yield increases were similar among sites”
t0“pasture”
Claim · model-written summary
Average crude protein concentration increased from 69 to 91 g kg -1 in the first year.
- Taxon
- Herbaget0
- Treatment
- manuret1
- Outcome
- crude protein (CP) concentratione0
- Direction
- increasede0
- Value
- 69 to 91 g kg -1e0
Not reportedComparator
Verbatim
e0“Average crude protein (CP) concentration also increased from 69 to 91 g kg -1 in the first year”
t0“Herbage”
t1“manure”
Claim · model-written summary
Grass yield did not respond in the second year under low rainfall.
Verbatim
e0“Despite low rainfall and the absence of a yield response in the second year, grass CP”
Claim · model-written summary
Increased manure application maximized grass crude protein in the second year.
- Taxon
- grasse0
- Treatment
- increased manure applicatione0
- Outcome
- grass CPe0
- Direction
- maximizede0
- Qualifier
- second yeart0
Not reportedComparator
Verbatim
e0“grass CP and crude protein yield (CPY) were maximized with increased manure application”
t0“second year”
Claim · model-written summary
Increased manure application maximized crude protein yield in the second year.
- Taxon
- grasse0
- Treatment
- increased manure applicatione0
- Outcome
- crude protein yield (CPY)e0
- Direction
- maximizede0
- Qualifier
- second yeart0
Not reportedComparator
Verbatim
e0“grass CP and crude protein yield (CPY) were maximized with increased manure application”
t0“second year”
Claim · model-written summary
Increasing manure decreased alfalfa forb yield.
- Taxon
- alfalfa
Medicago sativae0 - Treatment
- increasing manuree0
- Outcome
- alfalfae0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing manure decreasing alfalfa and increasing native forbs”
Claim · model-written summary
Increasing manure increased native forb yield.
Not reportedComparator
Verbatim
e0“increasing manure decreasing alfalfa and increasing native forbs”
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