Abstract
Furrow‐irrigated onion ( Allium cepa L.) production, with high N fertilization rates, may be contributing NO 3 –N to ground water in southeastern Colorado. This study determined the growth and N uptake patterns of onion grown on a silty clay soil, N fertilizer use efficiency (NFUE) of onion, and recovery of residual N fertilizer by corn ( Zea mays L.) following onion in rotation. Onion was sampled biweekly from 18 May to 15 Sept. 1998 from plots receiving 0 and 224 kg N ha −1 . Nonlabeled N and labeled 15 N fertilizer were band‐applied near the onion row in split applications of 112 kg N ha −1 each on 18 May and 25 June. Onion dry matter accumulation was slow from planting to about late May, followed by a rapid increase in biomass production and N uptake. Because residual soil NO 3 –N was high, N fertilization resulted in only a small increase in bulb yield. Greatest demand for N by onion occurred during bulb development. Fertilizer N recovery by onion was 11 and 19% for May and June N applications (average 15%), respectively. Much of the fertilizer N remained in the upper 60‐cm soil profile at harvest and had moved toward the onion bed center. Fertilizer 15 N detected at 180‐cm soil depth indicated leaching losses from the root zone. The unfertilized 1999 corn crop recovered 24% of fertilizer N applied to onion for a total fertilizer N uptake by the two crops of 39%. Delaying N fertilizer application until onion bulbing begins may improve NFUE. Planting corn directly on the previous onion bed may result in greater N fertilizer recovery by corn.
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Claims 11
Claim · model-written summary
N fertilization gave only a small increase in onion bulb yield because residual soil nitrate was high.
- Taxon
- onion
Allium cepae0 - Treatment
- N fertilizatione1
- Outcome
- bulb yielde1
- Direction
- increasee1
- Qualifier
- only a smalle1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Furrow‐irrigated onion ( Allium cepa L.)”
e1“Because residual soil NO 3 –N was high, N fertilization resulted in only a small increase in bulb yield”
Claim · model-written summary
Onion dry matter accumulation was slow until about late May and then increased rapidly with biomass production and N uptake.
- Taxon
- onionAllium cepae0
- Outcome
- dry matter accumulatione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Furrow‐irrigated onion ( Allium cepa L.)”
e2“Onion dry matter accumulation was slow from planting to about late May, followed by a rapid increase in biomass production and N uptake”
Claim · model-written summary
Onion N demand was greatest during bulb development.
- Taxon
- onionAllium cepae3
- Organ / stage
- bulb developmente3
- Outcome
- demand for Ne3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Greatest demand for N by onion occurred during bulb development”
Claim · model-written summary
Onion recovered 11 and 19% of fertilizer N from the May and June applications.
- Taxon
- onionAllium cepae4
- Outcome
- Fertilizer N recoverye4
- Value
- 11 and 19%e4
- Qualifier
- May and June N applicationse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Fertilizer N recovery by onion was 11 and 19% for May and June N applications (average 15%), respectively”
Claim · model-written summary
Average onion fertilizer N recovery was 15%.
- Taxon
- onionAllium cepae4
- Outcome
- Fertilizer N recoverye4
- Value
- 15%e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Fertilizer N recovery by onion was 11 and 19% for May and June N applications (average 15%), respectively”
Claim · model-written summary
Much of the fertilizer N remained in the upper 60 cm of the soil profile at harvest and had moved toward the onion bed center.
- Taxon
- onionAllium cepae0
- Outcome
- remained in the upper 60‐cm soil profilee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Furrow‐irrigated onion ( Allium cepa L.)”
e5“Much of the fertilizer N remained in the upper 60‐cm soil profile at harvest and had moved toward the onion bed center”
Claim · model-written summary
Fertilizer 15N detected at 180 cm depth indicated leaching losses from the root zone.
- Taxon
- onionAllium cepae0
- Outcome
- Fertilizer 15 N detected at 180‐cm soil depthe6
- Qualifier
- leaching losses from the root zonee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Furrow‐irrigated onion ( Allium cepa L.)”
e6“Fertilizer 15 N detected at 180‐cm soil depth indicated leaching losses from the root zone”
Claim · model-written summary
The unfertilized 1999 corn crop recovered 24% of the fertilizer N applied to onion.
- Taxon
- corn
Zea mays subsp. mayse7 - Outcome
- recoverede7
- Value
- 24%e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“The unfertilized 1999 corn crop recovered 24% of fertilizer N applied to onion”
Claim · model-written summary
Total fertilizer N uptake by the two crops was 39%.
- Taxon
- onionAllium cepae0
- Outcome
- total fertilizer N uptakee1
- Value
- 39%e1
- Qualifier
- by the two cropse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Furrow‐irrigated onion ( Allium cepa L.)”
e1“for a total fertilizer N uptake by the two crops of 39%”
Claim · model-written summary
Delaying N fertilizer application until onion bulbing begins may improve NFUE.
- Taxon
- onionAllium cepae1
- Outcome
- NFUEe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Delaying N fertilizer application until onion bulbing begins may improve NFUE”
Claim · model-written summary
Planting corn directly on the previous onion bed may give greater N fertilizer recovery by corn.
- Taxon
- cornZea mays subsp. mayse1
- Outcome
- N fertilizer recovery by corne1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Planting corn directly on the previous onion bed may result in greater N fertilizer recovery by corn”
The same questions in other papers
fertilization · yield · Allium cepa (onion)Positive and negative results
463 papers in the same direction as this paper · 59 in the opposite direction · 7 reporting no difference from an alternative
- no effect
- no effect
- positive
526 papers more in this group
See all 530 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.