Abstract
Abstract Potato ( Solanum tuberosum L.) production on sandy soils requires added N. Only 40–60% of the applied N is acquired by the crop. Increased N use efficiency (NUE) and its components, N utilization efficiency (NUtE) and N uptake efficiency (NUpE), could reduce fertilizer rates and environmental losses. We compared N efficiency in fresh‐market red potato varieties, in terms of yield and quality traits, and examined potential mechanisms for that efficiency including uptake, utilization, and increased root growth. We grew selections from a red potato breeding population and commercial varieties under two N rates: 101 and 202 kg N ha −1 . We compared NUE, NUpE, and NUtE in low and high N. We compared root phenotypes at tuber initiation and yield and skin quality metrics at harvest. Values for NUtE correlated with NUE and yield in low N and NUpE correlated with NUE and yield in high N. Low‐N conditions produced smaller tubers, while high N resulted primarily in medium tubers. Nitrogen did not affect skinning and redness but low N did result in slightly lighter skin color. Total root mass 45 d after planting (DAP) correlated with final yield and NUE but did not correlate with measures of N uptake across treatments. Larger roots correlated with NUpE only in the high‐N treatment. Selection under low N may reveal NUE and expose more stable representations of the genetic components of skin quality phenotypes. While skinning and skin color were more variable among varieties in low N, within variety they exhibited year‐to‐year consistency.
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Claims 10
Claim · model-written summary
Nitrogen utilization efficiency correlated with nitrogen use efficiency and yield under low nitrogen.
- Taxon
- Potato
Solanum tuberosume1 - Outcome
- NUtEe0
- Direction
- correlatede0
- Qualifier
- low Ne0
- Comparator
- NUE and yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Values for NUtE correlated with NUE and yield in low N”
e1“Potato ( Solanum tuberosum L.)”
Claim · model-written summary
Nitrogen uptake efficiency correlated with nitrogen use efficiency and yield under high nitrogen.
- Taxon
- PotatoSolanum tuberosume1
- Outcome
- NUpEe0
- Direction
- correlatede0
- Qualifier
- high Ne0
- Comparator
- NUE and yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NUpE correlated with NUE and yield in high N”
e1“Potato ( Solanum tuberosum L.)”
Claim · model-written summary
Low nitrogen produced smaller tubers.
- Taxon
- PotatoSolanum tuberosume1
- Treatment
- Low‐N conditionse0
- Outcome
- tuberse0
- Direction
- smallere0
- Comparator
- high Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low‐N conditions produced smaller tubers, while high N resulted primarily in medium tubers.”
e1“Potato ( Solanum tuberosum L.)”
Claim · model-written summary
High nitrogen produced primarily medium tubers.
- Taxon
- PotatoSolanum tuberosume1
- Treatment
- high Ne0
- Outcome
- tuberse0
- Direction
- mediume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high N resulted primarily in medium tubers”
e1“Potato ( Solanum tuberosum L.)”
Claim · model-written summary
Nitrogen did not affect skinning or redness.
- Taxon
- PotatoSolanum tuberosume1
- Treatment
- Nitrogene0
- Outcome
- skinning and rednesse0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen did not affect skinning and redness”
e1“Potato ( Solanum tuberosum L.)”
Claim · model-written summary
Low nitrogen produced slightly lighter skin color.
- Taxon
- PotatoSolanum tuberosume1
- Treatment
- low Ne0
- Outcome
- skin colore0
- Direction
- lightere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low N did result in slightly lighter skin color”
e1“Potato ( Solanum tuberosum L.)”
Claim · model-written summary
Root mass at 45 days correlated with final yield and nitrogen use efficiency.
- Taxon
- PotatoSolanum tuberosume1
- Outcome
- Total root masse0
- Direction
- correlatede0
- Qualifier
- 45 d after planting (DAP)e0
- Comparator
- final yield and NUEe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total root mass 45 d after planting (DAP) correlated with final yield and NUE”
e1“Potato ( Solanum tuberosum L.)”
Claim · model-written summary
Root mass did not correlate with nitrogen uptake measures.
- Taxon
- PotatoSolanum tuberosume1
- Outcome
- Total root masse0
- Direction
- did not correlatee0
- Comparator
- measures of N uptakee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total root mass 45 d after planting (DAP) correlated with final yield and NUE but did not correlate with measures of N uptake across treatments.”
e1“Potato ( Solanum tuberosum L.)”
Claim · model-written summary
Larger roots correlated with uptake efficiency only at high nitrogen.
- Taxon
- PotatoSolanum tuberosume1
- Outcome
- Larger rootse0
- Direction
- correlatede0
- Qualifier
- only in the high‐N treatmente0
- Comparator
- NUpEe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Larger roots correlated with NUpE only in the high‐N treatment.”
e1“Potato ( Solanum tuberosum L.)”
Claim · model-written summary
Skinning and skin color varied more among varieties at low nitrogen but were consistent within varieties across years.
- Taxon
- PotatoSolanum tuberosume1
- Outcome
- skinning and skin colore0
- Direction
- more variablee0
- Qualifier
- among varieties in low Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“skinning and skin color were more variable among varieties in low N, within variety they exhibited year‐to‐year consistency.”
e1“Potato ( Solanum tuberosum L.)”
The same questions in other papers
nitrogen · yield · Solanum tuberosum (potato)Results differ
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