Abstract
Research on the boron (B) fertility and B fertilizer practices in the Canadian prairie soils is very limited. Soil testing methodologies, associated criteria and fertilizer practices developed in other parts of the world have been adopted. Use of hot-water-extractable (HW) B as an extraction of available B in western Canadian soils is thought to be a good, simple and efficient technique. A project was carried out in the three Prairie Provinces that included a number of aspects of B fertility. Hence, soils that according to established HW B criteria were deemed to be either deficient or marginal in B were selected, and a series of 22 trials in seven separate experiments was carried out. The effects of method of placement (broadcast and incorporation and seed-placement) and associated rates (0 to 5.1 kg B ha -1 ) as well as foliar application of common granular and liquid B products on the seed yield, plant tissue levels of young canola plants and oil content of canola seed were evaluated. There was no significant yield increase in canola seed yield in any of the 22 experiments, although levels of HW B as low as 0.15 mg kg -1 were encountered. There was a significant correlation between B in canola tissue at growth stage BBCH 30–39 and the rate of applied B; however, tissue levels were not significantly correlated to HW B levels in soil samples taken at the time of tissue sampling. Thus, soil properties, especially soil organic matter, play an important role in determining the fate of applied B in the soil-plant system. We were not able to calibrate the HW B soil levels against the relative yield of canola from 18 strip trials carried out in a preliminary survey and the 22 replicated trials. Thus, it is concluded that hot-water extractable B is not an effective diagnostic tool for determining the B status of western Canadian prairie soils. Key words: Hot-water-extractable B, plant tissue B, oil content, critical level, seed yield
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Claims 7
Claim · model-written summary
Boron application produced no significant increase in canola seed yield in any of the 22 experiments.
- Taxon
- canola
.jpg?width=60)
Brassica napus var. napuse0 - Treatment
- boront1
- Outcome
- canola seed yielde0
- Direction
- no significant yield increasee0
- Qualifier
- any of the 22 experimentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“Canola”
t1“boron”
e0“There was no significant yield increase in canola seed yield in any of the 22 experiments”
Claim · model-written summary
Hot-water-extractable soil B levels as low as 0.15 mg kg -1 were encountered in the trials.
- Taxon
- CanolaBrassica napus var. napust0
- Outcome
- levels of HW Be0
- Direction
- as low ase0
- Value
- 0.15 mg kg -1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Canola”
e0“levels of HW B as low as 0.15 mg kg -1 were encountered”
Claim · model-written summary
B concentration in canola tissue at growth stage BBCH 30–39 was significantly correlated with the rate of applied B.
- Taxon
- canolaBrassica napus var. napuse0
- Organ / stage
- growth stage BBCH 30–39e0
- Treatment
- rate of applied Be0
- Outcome
- B in canola tissuee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a significant correlation between B in canola tissue at growth stage BBCH 30–39 and the rate of applied B”
Claim · model-written summary
Canola tissue B levels were not significantly correlated with hot-water-extractable B levels in soil samples taken at tissue sampling.
- Taxon
- CanolaBrassica napus var. napust0
- Outcome
- tissue levelse0
- Direction
- not significantly correlatede0
- Comparator
- HW B levels in soil samplese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Canola”
e0“tissue levels were not significantly correlated to HW B levels in soil samples taken at the time of tissue sampling”
Claim · model-written summary
Soil properties, especially soil organic matter, play an important role in determining the fate of applied B in the soil-plant system.
- Taxon
- CanolaBrassica napus var. napust0
- Outcome
- fate of applied B in the soil-plant systeme0
- Qualifier
- soil organic mattere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil properties, especially soil organic matter, play an important role in determining the fate of applied B in the soil-plant system”
t0“Canola”
Claim · model-written summary
Hot-water-extractable B soil levels could not be calibrated against relative canola yield in 18 strip trials and 22 replicated trials.
- Taxon
- canolaBrassica napus var. napuse0
- Outcome
- relative yield of canolae0
- Qualifier
- not able to calibrate the HW B soil levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Canola”
e0“We were not able to calibrate the HW B soil levels against the relative yield of canola from 18 strip trials carried out in a preliminary survey and the 22 replicated trials”
Claim · model-written summary
Hot-water-extractable B is not an effective diagnostic tool for determining the B status of western Canadian prairie soils.
- Taxon
- CanolaBrassica napus var. napust0
- Outcome
- not an effective diagnostic toole0
- Setting
- western Canadian prairie soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Canola”
e0“hot-water extractable B is not an effective diagnostic tool for determining the B status of western Canadian prairie soils”
The same questions in other papers
boron atom · yield · Brassica napus (oilseed rape)Results differ
8 papers in the same direction as this paper · 46 in the opposite direction
- positive
- positive
- no effect
51 papers more in this group
See all 55 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.