Abstract
The influences of preplant, broadcast P and K fertilizer on long-day yellow onion yield, quality, and storage characteristics were evaluated in 1995 and 1996 on a low-pH muck soil in north-central Ohio. Recommendations based on preseason soil tests indicated the crops would benefit from supplemental K, but not P, in 1995 and also in 1996. In both seasons, broadcast P rates were 0, 67, and 138 kg·ha –1 P 2 O 5 ; K rates were 0, 168 and 336 kg·ha of K 2 O. The 3 × 3 factorial of P and K treatments was replicated four times. Phosphorus rate did not significantly influence yield or quality in either 1995 or 1996. Total yield, percent marketable yield, and the concentration of K in the bulbs increased linearly with K in 1995, even though the highest K application rate exceeded the rate recommended by soil testing by more than 100 kg·ha –1 . Mean bulb size did not differ significantly among K rates. Potassium rate did not affect yield or quality in 1996, a drier year than 1995. After 5 months of commercial storage, onions from all nine treatments harvested in 1995 had similar amounts of rotten or sprouted bulbs, and weight loss. These results support the idea that P applications can be reduced or eliminated on high-P muck soils without reducing yield or quality. Onion response to applied K requires additional study before firm recommendations can be made.
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Claims 10
Claim · model-written summary
Phosphorus rate did not significantly affect onion yield or quality in either year.
- Taxon
- Onion
Allium cepat0 - Treatment
- Phosphorus ratee0
- Outcome
- yield or qualitye0
- Direction
- did not significantly influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus rate did not significantly influence yield or quality in either 1995 or 1996.”
t0“Onion”
Claim · model-written summary
Total onion yield increased linearly with K in 1995.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total yield, percent marketable yield, and the concentration of K in the bulbs increased linearly with K in 1995”
t0“Onion”
Claim · model-written summary
Percent marketable onion yield increased linearly with K in 1995.
- Taxon
- OnionAllium cepat0
- Treatment
- Ke0
- Outcome
- percent marketable yielde0
- Direction
- increased linearlye0
- Qualifier
- 1995e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total yield, percent marketable yield, and the concentration of K in the bulbs increased linearly with K in 1995”
t0“Onion”
Claim · model-written summary
Onion bulb potassium concentration increased linearly with K in 1995.
- Taxon
- OnionAllium cepat0
- Treatment
- Ke0
- Outcome
- concentration of K in the bulbse0
- Direction
- increased linearlye0
- Qualifier
- 1995e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total yield, percent marketable yield, and the concentration of K in the bulbs increased linearly with K in 1995”
t0“Onion”
Claim · model-written summary
Mean onion bulb size did not differ significantly among K rates.
- Taxon
- OnionAllium cepat0
- Treatment
- K ratese0
- Outcome
- Mean bulb sizee0
- Direction
- did not differe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mean bulb size did not differ significantly among K rates.”
t0“Onion”
Claim · model-written summary
Potassium rate did not affect onion yield or quality in the drier 1996 season.
- Taxon
- OnionAllium cepat0
- Treatment
- Potassium ratee0
- Outcome
- yield or qualitye0
- Direction
- did not affecte0
- Qualifier
- 1996, a drier year than 1995e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potassium rate did not affect yield or quality in 1996, a drier year than 1995.”
t0“Onion”
Claim · model-written summary
After five months storage, rotten or sprouted bulbs were similar across all treatments.
- Taxon
- onionsAllium cepae0
- Treatment
- all nine treatmentse0
- Outcome
- rotten or sprouted bulbse0
- Direction
- similare0
- Qualifier
- After 5 months of commercial storagee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 5 months of commercial storage, onions from all nine treatments harvested in 1995 had similar amounts of rotten or sprouted bulbs, and weight loss.”
Claim · model-written summary
After five months storage, weight loss was similar across all treatments.
- Taxon
- onionsAllium cepae0
- Treatment
- all nine treatmentse0
- Outcome
- weight losse0
- Direction
- similare0
- Qualifier
- After 5 months of commercial storagee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 5 months of commercial storage, onions from all nine treatments harvested in 1995 had similar amounts of rotten or sprouted bulbs, and weight loss.”
Claim · model-written summary
The authors conclude P application may be reduced or eliminated on high-P muck soils without reducing yield or quality.
- Taxon
- OnionAllium cepat0
- Outcome
- P applications can be reduced or eliminated on high-P muck soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P applications can be reduced or eliminated on high-P muck soils without reducing yield or quality”
t0“Onion”
Claim · model-written summary
The authors call for more study of onion response to applied K before firm recommendations.
- Taxon
- OnionAllium cepae0
- Outcome
- additional study before firm recommendations can be madee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Onion response to applied K requires additional study before firm recommendations can be made.”
The same questions in other papers
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See all 14 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.