Abstract
Field studies in Manitoba, Saskatchewan and Alberta over 3 yr evaluated immediate and residual effects of source, timing and placement of S fertilizers on sulphate-S supply to canola (Brassica napus L.). The treatments were compared under conventional tillage (CT) and in the establishment years of a reduced (RT) system. Sulphate-S in the soil was measured for two weeks after seeding, using PRS TM -probes. Sulphur concentration and N:S ratio were measured in canola tissue at flowering. Tillage system had little effect on available sulphate, tissue S concentration, N:S ratio or response to S fertilization. Ammonium sulphate (AS) generally increased tissue S concentration and reduced N:S ratio with all placements, and the effects of surface-applied ammonium thiosulphate (ATS) were similar to the effects of AS. Tiger 90, a bentonite-elemental S formulation, generally produced lower S concentrations in canola tissue at flowering than did AS, and levels were similar with elemental S and Tiger 90. Both tissue S concentration and N:S ratio were good indicators of S sufficiency for canola. Sulphate carryover from AS increased tissue S concentration and decreased N:S ratio in the year following application. In contrast, increases in tissue S concentration and decreases in N:S ratio were lower with Tiger 90 than AS. The oxidation of the residual elemental S in Tiger 90 could not be relied upon to increase tissue S concentration above deficiency levels in the year following application where soil sulphate levels were low. Key words: Elemental S, bentonite S, zero tillage, N:S ratio, PRS-probes
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Claims 12
Claim · model-written summary
Tillage had little effect on sulphate availability, tissue sulphur, N:S ratio, or fertilizer response.
- Taxon
- canola
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Brassica napus var. napust0 - Treatment
- Tillage systeme0
- Outcome
- available sulphate, tissue S concentration, N:S ratioe0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Tillage system had little effect on available sulphate, tissue S concentration, N:S ratio or response to S fertilization.”
t0“canola”
Claim · model-written summary
Ammonium sulphate increased tissue sulphur concentration across placements.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- Ammonium sulphate (AS)e0
- Outcome
- tissue S concentratione0
- Direction
- increasede0
- Qualifier
- with all placementse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ammonium sulphate (AS) generally increased tissue S concentration and reduced N:S ratio with all placements”
t0“canola”
Claim · model-written summary
Ammonium sulphate reduced the tissue N:S ratio across placements.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- Ammonium sulphate (AS)e0
- Outcome
- N:S ratioe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ammonium sulphate (AS) generally increased tissue S concentration and reduced N:S ratio with all placements”
t0“canola”
Claim · model-written summary
Surface applied ammonium thiosulphate had effects similar to ammonium sulphate.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- surface-applied ammonium thiosulphate (ATS)e0
- Outcome
- effects of surface-applied ammonium thiosulphate (ATS)e0
- Direction
- similare0
- Comparator
- ASe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effects of surface-applied ammonium thiosulphate (ATS) were similar to the effects of AS”
t0“canola”
Claim · model-written summary
Tiger 90 produced lower canola tissue sulphur concentrations than ammonium sulphate.
- Taxon
- canolaBrassica napus var. napuse0
- Organ / stage
- floweringe0
- Treatment
- Tiger 90e0
- Outcome
- S concentrations in canola tissuee0
- Direction
- lowere0
- Comparator
- ASe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tiger 90, a bentonite-elemental S formulation, generally produced lower S concentrations in canola tissue at flowering than did AS”
Claim · model-written summary
Elemental sulphur and Tiger 90 produced similar tissue sulphur levels.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- elemental Se0
- Outcome
- levelse0
- Direction
- similare0
- Comparator
- Tiger 90e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“levels were similar with elemental S and Tiger 90”
t0“canola”
Claim · model-written summary
Tissue sulphur concentration and N:S ratio were good indicators of canola sulphur sufficiency.
- Taxon
- canolaBrassica napus var. napuse0
- Outcome
- good indicators of S sufficiencye0
- Comparator
- tissue S concentration and N:S ratioe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both tissue S concentration and N:S ratio were good indicators of S sufficiency for canola.”
Claim · model-written summary
Carryover sulphate from ammonium sulphate increased tissue sulphur in the next year.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- Sulphate carryover from ASe0
- Outcome
- tissue S concentratione0
- Direction
- increasede0
- Qualifier
- year following applicatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sulphate carryover from AS increased tissue S concentration and decreased N:S ratio in the year following application.”
t0“canola”
Claim · model-written summary
Carryover sulphate from ammonium sulphate decreased tissue N:S ratio in the next year.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- Sulphate carryover from ASe0
- Outcome
- N:S ratioe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sulphate carryover from AS increased tissue S concentration and decreased N:S ratio in the year following application.”
t0“canola”
Claim · model-written summary
Tiger 90 produced smaller subsequent increases in tissue sulphur than ammonium sulphate.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- Tiger 90e0
- Outcome
- increases in tissue S concentratione0
- Direction
- lowere0
- Comparator
- ASe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increases in tissue S concentration and decreases in N:S ratio were lower with Tiger 90 than AS”
t0“canola”
Claim · model-written summary
Tiger 90 produced smaller subsequent decreases in tissue N:S ratio than ammonium sulphate.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- Tiger 90e0
- Outcome
- decreases in N:S ratioe0
- Direction
- lowere0
- Comparator
- ASe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increases in tissue S concentration and decreases in N:S ratio were lower with Tiger 90 than AS”
t0“canola”
Claim · model-written summary
Residual elemental sulphur in Tiger 90 could not reliably raise tissue sulphur above deficiency where soil sulphate was low.
- Taxon
- canolaBrassica napus var. napust0
- Treatment
- residual elemental S in Tiger 90e0
- Outcome
- tissue S concentratione0
- Direction
- increasee0
- Qualifier
- where soil sulphate levels were lowe0
- Comparator
- deficiency levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The oxidation of the residual elemental S in Tiger 90 could not be relied upon to increase tissue S concentration above deficiency levels in the year following application where soil sulphate levels were low.”
t0“canola”
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See all 8 papers →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.