Claim · model-written summary
Crops took up 26–51 kg S/ha at maturity with 40 kg S/ha added.
- Taxon
- winter oilseed rape
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Outcome
- 26–51 kg S/hae0
- Value
- 26–51 kg S/hae0
- Qualifier
- 40 kg S/hae0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
t0“winter oilseed rape (Brassica napus)”
e0“26–51 kg S/ha when 40 kg S/ha was applied”
Title
S. P. McGrath; F. J. Zhao The Journal of Agricultural Science 1996. doi:10.1017/s0021859600088808
Other claims from this paper (15)
- Intervention effect Sulphur at 40 kg/ha raised seed yield by 0·7 to 1·6 t/ha at the two higher nitrogen rates.
- Intervention effect Most seed-yield benefit came from the first 10 kg S/ha.
- Observation Further yield increases were unlikely beyond 40 kg S/ha.
- Intervention effect Raising nitrogen from 180 to 230 kg/ha decreased seed yield without sulphur in two seasons.
- Intervention effect Sulphur did not increase seed yield with zero or low nitrogen rates.
- Association Nitrogen and sulphur interactions on seed yield were significant in 1990/91 but not the other seasons.
- Intervention effect Sulphur increased seed oil content in the severely deficient 1993/94 season.
- Observation Crops took up 5–22 kg S/ha at maturity with 230 kg N/ha and no added sulphur.
- Observation Fertilizer sulphur utilization efficiency ranged from 50 to 73%.
- Intervention effect Sulphur treatment largely did not affect total plant nitrogen concentration.
- Observation Large amounts of nitrate nitrogen accumulated in leaves of sulphur-deficient plants in 1993/94.
- Mechanism The authors interpreted nitrate accumulation as evidence of disrupted nitrogen metabolism under sulphur deficiency.
- Observation Sulphur concentration and nitrogen:sulphur ratios varied considerably with time across tissues.
- Method / resource Leaf sulphur concentration at early flowering best predicted yield-related sulphur deficiency, with a critical value of 3·8 mg/g.
- Method / resource The leaf nitrogen:sulphur ratio was a poorer predictor of deficiency than leaf sulphur concentration.