Abstract
Brown girdling root rot (BGRR) is a serious and widespread disease of canola (Brassica rapa L.) in the Peace River region of northwestern Canada. There is no chemical control treatment for the pathogen, and farmers have observed that the disease is more severe when canola follows red fescue (Festuca rubra L.) or clover (Trifolium spp.) compared to summer fallow. A field study was conducted to determine how crop sequences following red fescue termination can be combined with residue and tillage management to reduce BGRR infection and increase canola yield. The five treatments consisted of rotations of: continuous canola (CCC) and oat (Avena sativa L.)-oat-canola (OOC), both managed using reduced tillage (RT), and wheat (Triticum aestivum L.)-wheat-canola (WWC), managed using RT, conventional tillage (CT) or no-till (NT). Canola yield followed the trend: OOC (RT) = WWC(RT) > WWC(CT) > CCC(RT) = WWC(NT). BGRR infection increased with tillage intensity: WWC(CT) > CCC(RT) = WWC(RT) = OOC(RT) > WWC(NT), and was reduced when canola followed two cereal break crops. Yield was highest when canola was preceded by a cereal crop and lowest without a break crop. The low yield with NT was attributed to poor crop emergence from a hard seed bed with unbroken turf and to competition from re-emerged fescue in the third year after fescue breaking. This study demonstrated that the cropping sequence and tillage system used influenced canola yield to a greater extent than did BGRR infection. Key words: Brown girdling root rot, canola, crop sequence, red fescue termination, tillage
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Claims 7
Claim · model-written summary
Canola yield ranked OOC and WWC under reduced tillage above WWC conventional tillage, with CCC and WWC no till lowest.
- Taxon
- canola
.jpg?width=60)
Brassica napus var. napust0 - Treatment
- OOC (RT) = WWC(RT)e0
- Outcome
- Canola yielde0
- Direction
- >e0
- Comparator
- CCC(RT) = WWC(NT)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Canola yield followed the trend: OOC (RT) = WWC(RT) > WWC(CT) > CCC(RT) = WWC(NT).”
t0“canola”
Claim · model-written summary
Root rot infection was highest under WWC conventional tillage and lowest under WWC no till.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- tillage intensitye0
- Outcome
- BGRR infectione0
- Direction
- increasede0
- Comparator
- WWC(NT)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BGRR infection increased with tillage intensity: WWC(CT) > CCC(RT) = WWC(RT) = OOC(RT) > WWC(NT)”
t0“canola”
Claim · model-written summary
Two cereal break crops reduced root rot infection.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- two cereal break cropse0
- Outcome
- was reducede0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was reduced when canola followed two cereal break crops.”
t0“canola”
Claim · model-written summary
Canola yield was highest after cereal crops and lowest without a break crop.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- a cereal crope0
- Outcome
- Yielde0
- Direction
- higheste0
- Comparator
- without a break crope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield was highest when canola was preceded by a cereal crop and lowest without a break crop.”
t0“canola”
Claim · model-written summary
Poor emergence from a hard seedbed contributed to low no till yield.
- Taxon
- canolaBrassica napus var. napust0
- Outcome
- low yielde0
- Qualifier
- poor crop emergence from a hard seed bed with unbroken turfe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The low yield with NT was attributed to poor crop emergence from a hard seed bed with unbroken turf”
t0“canola”
Claim · model-written summary
Competition from re emerged fescue contributed to low no till yield.
- Taxon
- canolaBrassica napus var. napust0
- Interactor
- fescuee0weed
- Outcome
- competition from re-emerged fescuee0
- Qualifier
- in the third year after fescue breakinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and to competition from re-emerged fescue in the third year after fescue breaking.”
t0“canola”
Claim · model-written summary
Cropping sequence and tillage affected canola yield more than infection did.
- Taxon
- canolaBrassica napus var. napust0
- Outcome
- canola yielde0
- Qualifier
- cropping sequence and tillage systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the cropping sequence and tillage system used influenced canola yield to a greater extent than did BGRR infection.”
t0“canola”
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tillage · yield · Brassica napus (oilseed rape)Positive and negative results
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- negative
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Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.