Abstract
Abstract BACKGROUND: Crop management has been implicated in tuber sugar accumulation and potato processing quality. However, reports on potato postharvest behaviour, tuber composition and processing quality in response to crop nitrogen (N) fertilisation have been sparse and inconclusive. In this study, chipping potato cv. Hermes was treated with four preplanting N rates (0, 100, 200 and 300 kg ha −1 ) to evaluate the effect of N fertilisation on sugar accumulation profiles and processing quality at harvest, after cold storage at 4.5 °C for up to 200 days and after reconditioning at 16 °C for 10–30 days. RESULTS: Preharvest leaf petiole analysis and tuber nitrate analysis at harvest confirmed crop response to N rates. At harvest, tuber specific gravity decreased marginally beyond 200 kg N ha −1 . Chip colour as well as tuber sucrose and reducing sugar (RS) content was unaffected by N fertilisation rate. During cold storage and reconditioning, tuber fresh weight loss and sprout growth were unaffected by N rate, while its effect on tuber sugar levels was either statistically or practically insignificant. Tuber sucrose and RS contents correlated highly with chip colour ( r = − 0.729, P <0.001 and r = −0.791, P <0.001 respectively). Importantly, postharvest chip colour was also unaffected by N rate, though it declined markedly with the onset of cold storage and improved significantly throughout reconditioning. Differences in chip colour between years were limited but potentially critical in meeting the commercial standard. CONCLUSION: Completion of physiological crop senescence of the spring potato crop under Mediterranean climatic conditions seems to mitigate the potential interference of preplanting N fertilisation with tuber maturation and subsequently cold storage performance, reconditioning potential and processing quality. Copyright © 2009 Society of Chemical Industry
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Claims 12
Claim · model-written summary
Petiole and tuber nitrate analyses confirmed crop response to nitrogen rates.
- Taxon
- potato
Solanum tuberosumt0 - Treatment
- N ratese0
- Outcome
- crop response to N ratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Preharvest leaf petiole analysis and tuber nitrate analysis at harvest confirmed crop response to N rates”
t0“spring potato (Solanum tuberosum L. cv. Hermes)”
Claim · model-written summary
Tuber specific gravity decreased marginally beyond 200 kg N ha −1.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- beyond 200 kg N ha −1e0
- Outcome
- tuber specific gravitye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tuber specific gravity decreased marginally beyond 200 kg N ha −1”
t0“spring potato (Solanum tuberosum L. cv. Hermes)”
Claim · model-written summary
Nitrogen rate did not affect chip colour or tuber sucrose and reducing sugar content at harvest.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- N fertilisation ratee0
- Outcome
- Chip colour as well as tuber sucrose and reducing sugar (RS) contente0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chip colour as well as tuber sucrose and reducing sugar (RS) content was unaffected by N fertilisation rate”
t0“spring potato (Solanum tuberosum L. cv. Hermes)”
Claim · model-written summary
Nitrogen rate did not affect tuber weight loss and sprout growth during storage and reconditioning.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- N ratee0
- Outcome
- tuber fresh weight loss and sprout growthe0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tuber fresh weight loss and sprout growth were unaffected by N rate”
t0“spring potato (Solanum tuberosum L. cv. Hermes)”
Claim · model-written summary
Nitrogen rate had statistically or practically insignificant effect on tuber sugar levels.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- N ratee1
- Outcome
- tuber sugar levelse0
- Direction
- insignificante0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“its effect on tuber sugar levels was either statistically or practically insignificant”
e1“During cold storage and reconditioning, tuber fresh weight loss and sprout growth were unaffected by N rate, while its effect on tuber sugar levels was either statistically or practically insignificant”
t0“spring potato (Solanum tuberosum L. cv. Hermes)”
Claim · model-written summary
Tuber sucrose content correlated negatively with chip colour.
- Taxon
- potatoSolanum tuberosumt0
- Compound
- Tuber sucrosee0
- Outcome
- chip coloure0
- Value
- r = − 0.729e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tuber sucrose and RS contents correlated highly with chip colour ( r = − 0.729, P <0.001 and r = −0.791, P <0.001 respectively)”
t0“spring potato (Solanum tuberosum L. cv. Hermes)”
Claim · model-written summary
Tuber reducing sugar content correlated negatively with chip colour.
- Taxon
- potatoSolanum tuberosumt0
- Compound
- RSe0
- Outcome
- chip coloure0
- Value
- r = −0.791e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tuber sucrose and RS contents correlated highly with chip colour ( r = − 0.729, P <0.001 and r = −0.791, P <0.001 respectively)”
t0“spring potato (Solanum tuberosum L. cv. Hermes)”
Claim · model-written summary
Postharvest chip colour was unaffected by nitrogen rate.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- N ratee0
- Outcome
- postharvest chip coloure0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“postharvest chip colour was also unaffected by N rate”
t0“spring potato (Solanum tuberosum L. cv. Hermes)”
Claim · model-written summary
Chip colour declined markedly with onset of cold storage.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- cold storagee0
- Outcome
- chip coloure1
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it declined markedly with the onset of cold storage”
e1“Importantly, postharvest chip colour was also unaffected by N rate, though it declined markedly with the onset of cold storage and improved significantly throughout reconditioning”
t0“spring potato (Solanum tuberosum L. cv. Hermes)”
Claim · model-written summary
Chip colour improved significantly throughout reconditioning.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- reconditioninge0
- Outcome
- chip coloure1
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“improved significantly throughout reconditioning”
e1“Importantly, postharvest chip colour was also unaffected by N rate, though it declined markedly with the onset of cold storage and improved significantly throughout reconditioning”
t0“spring potato (Solanum tuberosum L. cv. Hermes)”
Claim · model-written summary
Chip colour differed little between years but differences could matter for commercial standards.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- Differences in chip colour between yearse0
- Direction
- limitede0
- Qualifier
- potentially critical in meeting the commercial standarde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences in chip colour between years were limited but potentially critical in meeting the commercial standard”
t0“spring potato (Solanum tuberosum L. cv. Hermes)”
Claim · model-written summary
Crop senescence was proposed to mitigate nitrogen interference with tuber maturation and processing quality.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- preplanting N fertilisatione0
- Outcome
- tuber maturation and subsequently cold storage performance, reconditioning potential and processing qualitye0
- Qualifier
- Completion of physiological crop senescencee0
- Setting
- Mediterranean climatic conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Completion of physiological crop senescence of the spring potato crop under Mediterranean climatic conditions seems to mitigate the potential interference of preplanting N fertilisation with tuber maturation and subsequently cold storage performance, reconditioning potential and processing quality”
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