Abstract
Optimum K fertilizer placement for no‐till soybean [ Glycine max (L.) Merr.] yield and quality in wide‐row production systems may not be appropriate for narrow‐row systems. Potassium fertilizer placement and row width effects on no‐till soybean were evaluated from 1998 through 2000 on a continuous no‐till soil with low, but stratified, soil‐test K. Four K fertilizer placements of surface broadcast, 76‐cm band width, 38‐cm band width, and zero K were compared at a single rate of 100 kg K ha −1 for soybean planted in 76‐, 38‐, and 19‐cm row widths. Broadcast K application significantly increased leaf K concentrations in all 3 yr. Band placement increased soybean leaf K more than surface broadcast in 2 of 3 yr. Band placement increased yield 10 to 15% in 76‐ and 38‐cm rows, compared with zero K, while seed yield was not significantly improved by surface broadcasting in any row‐width system. Within the 19‐ and 38‐cm row width systems, soybean rows positioned midway between the K fertilizer bands had lower K uptake and productivity than soybean rows seeded above the K bands. Banded K also increased seed K concentrations and accumulation more than broadcast application in 76‐ and 38‐cm row widths. Seed oil concentrations were increased by band placement, and were often positively correlated with leaf K, seed K, and seed yield. Potassium banding was superior to surface broadcasting for plant K nutrition, yield, and seed oil concentrations in both wide and intermediate row‐width systems, but not in narrow‐row soybean production, on low soil‐test K fields.
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Claims 8
Claim · model-written summary
Broadcast K increased leaf K in all three years.
- Taxon
- soybean
Glycine maxt0 - Treatment
- Broadcast K applicatione0
- Outcome
- leaf K concentrationse0
- Direction
- increasede0
- Qualifier
- all 3 yre0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Broadcast K application significantly increased leaf K concentrations in all 3 yr.”
t0“no‐till soybean”
Claim · model-written summary
Band placement raised leaf K more than broadcast in two years.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Band placemente0
- Outcome
- soybean leaf Ke0
- Direction
- increasede0
- Qualifier
- 2 of 3 yre0
- Comparator
- surface broadcaste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Band placement increased soybean leaf K more than surface broadcast in 2 of 3 yr.”
Claim · model-written summary
Band placement raised yield 10 to 15% in 76 and 38 cm rows against zero K.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Band placemente0
- Outcome
- yielde0
- Direction
- increasede0
- Value
- 10 to 15%e0
- Qualifier
- 76‐ and 38‐cm rowse0
- Comparator
- zero Ke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Band placement increased yield 10 to 15% in 76‐ and 38‐cm rows, compared with zero K”
t0“no‐till soybean”
Claim · model-written summary
Surface broadcast did not significantly improve seed yield.
- Taxon
- soybeanGlycine maxt0
- Treatment
- surface broadcastinge0
- Outcome
- seed yielde0
- Direction
- not significantly improvede0
- Qualifier
- any row‐width systeme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed yield was not significantly improved by surface broadcasting in any row‐width system”
t0“no‐till soybean”
Claim · model-written summary
Rows midway between bands had lower K uptake and productivity than rows over bands.
- Taxon
- soybeanGlycine maxe0
- Treatment
- rows positioned midway between the K fertilizer bandse0
- Outcome
- K uptake and productivitye0
- Direction
- lowere0
- Qualifier
- 19‐ and 38‐cm row width systemse0
- Comparator
- soybean rows seeded above the K bandse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Within the 19‐ and 38‐cm row width systems, soybean rows positioned midway between the K fertilizer bands had lower K uptake and productivity than soybean rows seeded above the K bands.”
Claim · model-written summary
Banded K raised seed K concentration and accumulation more than broadcast.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Banded Ke0
- Outcome
- seed K concentrations and accumulatione0
- Direction
- increasede0
- Qualifier
- 76‐ and 38‐cm row widthse0
- Comparator
- broadcast applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Banded K also increased seed K concentrations and accumulation more than broadcast application in 76‐ and 38‐cm row widths.”
t0“no‐till soybean”
Claim · model-written summary
Band placement raised seed oil concentrations.
- Taxon
- soybeanGlycine maxt0
- Treatment
- band placemente0
- Outcome
- Seed oil concentrationse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed oil concentrations were increased by band placement”
t0“no‐till soybean”
Claim · model-written summary
Seed oil was often positively correlated with leaf K, seed K and seed yield.
- Taxon
- soybeanGlycine maxt0
- Compound
- leaf K, seed K, and seed yielde0
- Outcome
- Seed oil concentrationse0
- Direction
- positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed oil concentrations were increased by band placement, and were often positively correlated with leaf K, seed K, and seed yield”
t0“Seed Composition of No‐Till Soybean”
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