Abstract
Core Ideas A dual‐release boron (B) fertilizer can reduce the risks of seedling toxicity and leaching. Muriate of potash (MOP) was co‐compacted with slow‐ and fast‐release B sources. MOP+B resulted in a more uniform B spatial distribution compared to traditional bulk‐blends. Incorporation of colemanite in the formulation slowed the release of B from the MOP+B fertilizers. This novel B fertilizer may improve the synchrony between nutrient availability and crop demand. Boron (B) supply to crops is a challenging fertilization practice, due to its high mobility in soil, its narrow window between deficiency and toxicity and the necessity to evenly apply this micronutrient to the soil. We aimed to increase B fertilizer efficacy through the use of slow‐ and fast‐release borate compounds in a macronutrient carrier fertilizer. Borax, ulexite, and colemanite (alone or combined) were compacted with muriate of potash (MOP) to produce B‐enriched fertilizers varying in proportion of water‐soluble B. One such fertilizer was assessed for spatial B distribution compared with a bulk blend equivalent in a soil tray, while others were assessed for nutrient release in a soil column, and canola ( Brassica napus L.) growth in a leached and non‐leached pot trial. The compacted MOP+B fertilizer improved B distribution in soil compared to a simulated bulk blend. The release of B was fastest for borax (>93% released within 2.5 pore volumes [PV]) and slowest for colemanite (<20% released after 20 PV). The combination of slow‐ and fast‐release B sources resulted in initial fast‐release of B followed by a constant slower B release. In leached soil, the higher B losses (up to 80% of applied B) resulted in lower canola B uptake with increasing borax and decreasing colemanite in the formulation. In non‐leached soils, there was no difference in B uptake among fertilizer treatments. The use of dual release B sources in MOP+B fertilizer formulations effectively addresses the risk of B loss, and better matches crop B demands during growth.
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Claims 9
Claim · model-written summary
The compacted MOP+B fertilizer improved B distribution in soil compared with a simulated bulk blend.
- Taxon
- canola
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Brassica napus var. napuse0 - Treatment
- compacted MOP+B fertilizere1
- Outcome
- B distribution in soile1
- Direction
- improvede1
- Comparator
- simulated bulk blende1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“canola ( Brassica napus L.) growth”
e1“The compacted MOP+B fertilizer improved B distribution in soil compared to a simulated bulk blend”
Claim · model-written summary
Borax released B fastest, with over 93% released within 2.5 pore volumes.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- boraxe2
- Outcome
- release of Be2
- Direction
- fasteste2
- Value
- >93% released within 2.5 pore volumese2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“canola ( Brassica napus L.) growth”
e2“The release of B was fastest for borax (>93% released within 2.5 pore volumes [PV])”
Claim · model-written summary
Colemanite released B slowest, with under 20% released after 20 pore volumes.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- colemanitee3
- Outcome
- release of Be2
- Direction
- sloweste3
- Value
- <20% released after 20 PVe3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“canola ( Brassica napus L.) growth”
e2“The release of B was fastest for borax (>93% released within 2.5 pore volumes [PV])”
e3“slowest for colemanite (<20% released after 20 PV)”
Claim · model-written summary
The combination of slow- and fast-release B sources gave initial fast release of B followed by a slower, constant release.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- The combination of slow‐ and fast‐release B sourcese4
- Outcome
- release of Be4
- Qualifier
- initial fast‐release of B followed by a constant slower B releasee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“canola ( Brassica napus L.) growth”
e4“The combination of slow‐ and fast‐release B sources resulted in initial fast‐release of B followed by a constant slower B release”
Claim · model-written summary
Incorporating colemanite into the formulation slowed the release of B from MOP+B fertilizers.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- Incorporation of colemanitee5
- Outcome
- release of Be5
- Direction
- slowede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“canola ( Brassica napus L.) growth”
e5“Incorporation of colemanite in the formulation slowed the release of B from the MOP+B fertilizers”
Claim · model-written summary
In leached soil, B losses reached up to 80% of applied B.
- Taxon
- canolaBrassica napus var. napuse0
- Outcome
- B lossese6
- Direction
- highere6
- Value
- up to 80% of applied Be6
- Setting
- leached soile6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“canola ( Brassica napus L.) growth”
e6“In leached soil, the higher B losses (up to 80% of applied B) resulted in lower canola B uptake with increasing borax and decreasing colemanite in the formulation”
Claim · model-written summary
In leached soil, increasing borax and decreasing colemanite in the formulation lowered canola B uptake.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- increasing borax and decreasing colemanite in the formulatione6
- Outcome
- canola B uptakee6
- Direction
- lowere6
- Setting
- leached soile6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“canola ( Brassica napus L.) growth”
e6“In leached soil, the higher B losses (up to 80% of applied B) resulted in lower canola B uptake with increasing borax and decreasing colemanite in the formulation”
Claim · model-written summary
In non-leached soils, canola B uptake did not differ among fertilizer treatments.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- fertilizer treatmentse7
- Outcome
- B uptakee7
- Direction
- no_changeinferrede7
- Setting
- non‐leached soilse7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“canola ( Brassica napus L.) growth”
e7“In non‐leached soils, there was no difference in B uptake among fertilizer treatments”
Claim · model-written summary
The authors state that dual-release B sources in MOP+B formulations effectively address the risk of B loss and better match crop B demands during growth.
Not reportedTaxon
Verbatim
e6“The use of dual release B sources in MOP+B fertilizer formulations effectively addresses the risk of B loss, and better matches crop B demands during growth”
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