Abstract
Since the early 1990s canola (oilseed rape, Brassica napus L.) has become a major crop species grown on the predominantly sandy soils of southwestern Australia. Numerous studies have been undertaken to determine the fertilizer requirements of the crop in the region. This paper reports results of a field experiment conducted at three sites on typical acidified (pH [Ca] ∼4.6) sandy gravel soils to identify if molybdenum (Mo), manganese (Mn) or boron (B) were deficient for canola grain production. Different levels of each element, separately or as mixtures, were applied as foliar sprays at mid-flowering. Maximum grain yield responses of ∼11–20% to applied Mo, as sodium molybdate (39% Mo), were obtained when 40 g Mo/ha was applied. Maximum grain yield responses of ∼13–28% to applied Mn were achieved by applying 1000 g ha−1 Mn, as manganese sulfate (24% Mn). A mixture of 40 g Mo ha−1 and 1000 g Mn ha−1 increased grain yields by ∼15–38%. Boron, applied as borax (11% B), sprayed individually or in combination with Mo or/and Mn, had no effect on grain yields. None of the foliar spray treatments had any effect on oil concentration in canola grain. The sprays did not cause any visible damage to foliage. Soil acidification has been shown to induce Mo deficiency for cereal crops in the region and both soil acidification and induced Mo deficiency are alleviated by applying sufficient lime to raise pH of top 10 cm soil to 5.5 or greater, and this strategy should also apply to canola. Further research is required to determine the fertilizer Mn requirements for canola grain production in the region.
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Claims 7
Claim · model-written summary
Foliar Mo at 40 g Mo/ha produced maximum canola grain yield responses of about 11–20%.
- Taxon
- canola
.jpg?width=60)
Brassica napus var. napuse1 - Treatment
- 40 g Mo/hae0
- Outcome
- grain yield responsese0
- Direction
- Maximume0
- Value
- ∼11–20%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Maximum grain yield responses of ∼11–20% to applied Mo, as sodium molybdate (39% Mo), were obtained when 40 g Mo/ha was applied.”
e1“canola (oilseed rape, Brassica napus L.)”
Claim · model-written summary
Foliar Mn at 1000 g ha−1 gave maximum grain yield responses of about 13–28%.
- Taxon
- canolaBrassica napus var. napuse1
- Treatment
- 1000 g ha−1 Mne0
- Outcome
- grain yield responsese0
- Direction
- Maximume0
- Value
- ∼13–28%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum grain yield responses of ∼13–28% to applied Mn were achieved by applying 1000 g ha−1 Mn, as manganese sulfate (24% Mn).”
e1“canola (oilseed rape, Brassica napus L.)”
Claim · model-written summary
Combined foliar Mo and Mn increased canola grain yields by about 15–38%.
- Taxon
- canolaBrassica napus var. napuse1
- Treatment
- A mixture of 40 g Mo ha−1 and 1000 g Mn ha−1e0
- Outcome
- grain yieldse0
- Direction
- increasede0
- Value
- ∼15–38%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A mixture of 40 g Mo ha−1 and 1000 g Mn ha−1 increased grain yields by ∼15–38%.”
e1“canola (oilseed rape, Brassica napus L.)”
Claim · model-written summary
Foliar boron alone or with Mo or Mn had no effect on canola grain yield.
- Taxon
- canolaBrassica napus var. napuse1
- Treatment
- Boron, applied as borax (11% B)e0
- Outcome
- grain yieldse0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Boron, applied as borax (11% B), sprayed individually or in combination with Mo or/and Mn, had no effect on grain yields.”
e1“canola (oilseed rape, Brassica napus L.)”
Claim · model-written summary
Foliar spray treatments did not affect canola grain oil concentration.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- foliar spray treatmentse0
- Outcome
- oil concentration in canola graine0
- Direction
- had any effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“None of the foliar spray treatments had any effect on oil concentration in canola grain.”
Claim · model-written summary
Foliar sprays caused no visible foliage damage.
- Taxon
- canolaBrassica napus var. napuse1
- Outcome
- did not cause any visible damage to foliagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The sprays did not cause any visible damage to foliage.”
e1“canola (oilseed rape, Brassica napus L.)”
Claim · model-written summary
The authors recommend liming acidified soil to topsoil pH 5.5 or greater for canola.
- Taxon
- canolaBrassica napus var. napuse0
- Outcome
- applying sufficient lime to raise pH of top 10 cm soil to 5.5 or greatere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this strategy should also apply to canola.”
e1“applying sufficient lime to raise pH of top 10 cm soil to 5.5 or greater”
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