Abstract
Canola is becoming a major source of vegetable oil with increasing demand in South Africa, yet low yields are presently experienced in production areas of the Western Cape Province. Crop response to fertiliser applications in field trials under rainfed conditions are often poor, because of a large number of growth factors that may limit growth and yield. To determine how canola responds to nitrogen (N) with no (low) and high sulphur (S) rates under ideal conditions in a controlled environment, a 5 x 2 factorial experiment, with N (0, 40, 80, 120 and 160 kg ha -1 ) and S (0 and 40 kg ha -1 ) fertilisation rates, was conducted. Plants were irrigated with a nutrient solution which contained all nutrients, but with very low N and S contents. Nitrogen application significantly increased leaf area, hence dry mass accumulation and ultimately flowering and pod formation, but high N and S application levels during early growth stages may have a negative effect on growth. Significant interaction between N and S were shown, however the positive effects of S were more pronounced in the reproductive phases. In this experiment, conducted under controlled temperature and watering conditions, but short winter daylight lengths, yield components of canola as measured by the number of flowers and pods at 91 DAP tended to reach a peak at application rates of 120 kg N ha -1 and 40 kg S ha -1 .
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Claims 6
Claim · model-written summary
Nitrogen application significantly increased canola leaf area
- Taxon
- canola (Brassica napus L.)
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Treatment
- Nitrogen applicatione1
- Outcome
- leaf areae1
- Direction
- increasede1
- Setting
- controlled environmente2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
t0“canola (Brassica napus L.)”
e1“Nitrogen application significantly increased leaf area, hence dry mass accumulation and ultimately flowering and pod formation”
e2“under ideal conditions in a controlled environment”
Claim · model-written summary
Nitrogen application significantly increased dry mass accumulation, flowering and pod formation in canola
- Taxon
- canola (Brassica napus L.)Brassica napust0
- Treatment
- Nitrogen applicatione1
- Outcome
- dry mass accumulation and ultimately flowering and pod formatione1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“canola (Brassica napus L.)”
e1“Nitrogen application significantly increased leaf area, hence dry mass accumulation and ultimately flowering and pod formation”
Claim · model-written summary
High N and S application during early growth stages may reduce canola growth
- Taxon
- canola (Brassica napus L.)Brassica napust0
- Organ / stage
- early growth stagese3
- Treatment
- high N and S application levelse3
- Outcome
- growthe3
- Qualifier
- maye3
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“canola (Brassica napus L.)”
e3“high N and S application levels during early growth stages may have a negative effect on growth”
Claim · model-written summary
Significant interaction between N and S was shown for canola growth
- Taxon
- canola (Brassica napus L.)Brassica napust0
- Treatment
- N and Se4
- Outcome
- interaction between N and Se4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“canola (Brassica napus L.)”
e4“Significant interaction between N and S were shown”
Claim · model-written summary
Positive effects of S on canola were more pronounced in reproductive phases
- Taxon
- canola (Brassica napus L.)Brassica napust0
- Organ / stage
- reproductive phasese5
- Treatment
- Se5
- Outcome
- positive effectse5
- Direction
- more pronouncede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“canola (Brassica napus L.)”
e5“the positive effects of S were more pronounced in the reproductive phases”
Claim · model-written summary
Canola flower and pod number at 91 DAP tended to peak at 120 kg N ha -1 and 40 kg S ha -1
- Taxon
- canola (Brassica napus L.)Brassica napust0
- Treatment
- 120 kg N ha -1 and 40 kg S ha -1e6
- Outcome
- number of flowers and pods at 91 DAPe6
- Direction
- reach a peake6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“canola (Brassica napus L.)”
e6“yield components of canola as measured by the number of flowers and pods at 91 DAP tended to reach a peak at application rates of 120 kg N ha -1 and 40 kg S ha -1”
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