Abstract
Abstract Field experiments were conducted on organic soil for 3 years using relatively high rates of N to evaluate the influence of N on the growth and maturity of onions. In 2 years with low rainfall, maturity was not influenced, but yields declined with increasing rates of N. The decline in yield was originally attributed to ammonium toxicity, but observations with 3 sources of N indicated that high concn of fertilizer salts also could have caused injury to the plants. With high rainfall, yields increased with each increase in N, and as much as 240 lb. of N/acre was required for normal growth and maturation, while those onions receiving less than 120 lb. of N/acre were deficient in N and failed to mature properly. Utilizing different methods of incorporating N in the soil to evaluate the toxic response to N was unsuccessful in the wet season. Some indication of injury to the young seedlings occurred with the highest rates of N banded beneath the row, but these symptoms disappeared during subsequent periods of high rainfall.
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Claims 8
Claim · model-written summary
Under low rainfall, increasing nitrogen did not affect onion maturity.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 2 years with low rainfall, maturity was not influenced”
t0“onions”
Claim · model-written summary
Under low rainfall, onion yields declined with increasing nitrogen rates.
- Taxon
- onions
Allium cepat0 - Treatment
- increasing rates of Ne0
- Outcome
- yieldse0
- Direction
- declinede0
- Setting
- low rainfalle0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 2 years with low rainfall, maturity was not influenced, but yields declined with increasing rates of N”
t0“onions”
Claim · model-written summary
Observations with three nitrogen sources suggested that high fertilizer salt concentrations could cause onion injury.
- Taxon
- onionsAllium cepat0
- Outcome
- injury to the plantse0
- Qualifier
- high concn of fertilizer saltse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“observations with 3 sources of N indicated that high concn of fertilizer salts also could have caused injury to the plants”
t0“onions”
Claim · model-written summary
With high rainfall, onion yields increased at each increase in nitrogen.
- Taxon
- onionsAllium cepat0
- Treatment
- each increase in Ne0
- Outcome
- yieldse0
- Direction
- increasede0
- Setting
- high rainfalle0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With high rainfall, yields increased with each increase in N”
t0“onions”
Claim · model-written summary
With high rainfall, up to 240 lb. of nitrogen per acre was required for normal onion growth and maturation.
- Taxon
- onionsAllium cepat0
- Outcome
- normal growth and maturatione0
- Value
- 240 lb. of N/acree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“as much as 240 lb. of N/acre was required for normal growth and maturation”
t0“onions”
Claim · model-written summary
With high rainfall, onions receiving less than 120 lb. nitrogen per acre were deficient in nitrogen and failed to mature properly.
- Taxon
- onionsAllium cepae0
- Treatment
- less than 120 lb. of N/acree0
- Outcome
- deficient in N and failed to mature properlye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“those onions receiving less than 120 lb. of N/acre were deficient in N and failed to mature properly”
Claim · model-written summary
The highest nitrogen rates banded beneath the row caused indications of injury in young onion seedlings.
- Taxon
- onionsAllium cepat0
- Organ / stage
- young seedlingse0
- Treatment
- highest rates of N banded beneath the rowe0
- Outcome
- injury to the young seedlingse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Some indication of injury to the young seedlings occurred with the highest rates of N banded beneath the row”
t0“onions”
Claim · model-written summary
The onion seedling injury symptoms disappeared during subsequent high rainfall.
- Taxon
- onionsAllium cepat0
- Outcome
- symptoms disappearede0
- Setting
- high rainfalle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these symptoms disappeared during subsequent periods of high rainfall”
t0“onions”
The same questions in other papers
nitrogen · phenology · Allium cepa (onion)Positive and negative results
3 papers in the same direction as this paper · 8 in the opposite direction
- positive
- positive
- positive
8 papers more in this group
See all 12 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.