Abstract
Abstract Potato ( Solanum tuberosum L.) is a N intensive crop, and meeting its requirements with N fertilization is the primary practice to improve N recovery and achieve suitable tuber yield. A 3‐site‐year (SY) study was conducted to assess soil plant analysis development (SPAD)‐502 chlorophyll meter efficacy for providing potato leaf real‐time N status to adjust N timing and rate using nitrogen sufficiency index (NSI) thresholds of 90 or 95%. We evaluated effects of in‐season SPAD‐based N managements, as well as a reference with non‐limiting N application, a fixed‐timing (planting and hilling) conventional N fertilization, and a zero‐N control on crop N uptake, tuber yield, and N‐use efficiency of potato cultivar Agata grown in tropical clay soils. Tuber yields were similar in both SPAD‐based managements. Under no intensive rainfall events after N applications, SPAD‐based managements reduced N applications by 38–63% and resulted in comparable tuber set, bulking, and yield relative to conventional N fertilization. Additionally, SPAD‐based management at a NSI threshold of 90% resulted in greater potato N‐uptake efficiency and tuber yield per unit of N applied. SPAD‐502 sensor was efficient for detecting plant N status when environmental conditions were more conducive for potato production and optimized N management by reducing application rates. However, with less favorable temperature and solar radiation for potato cultivation, and with intensive rainfall events following N application, SPAD readings did not guide to a proper N fertilization and resulted in reduced tuber yield. Therefore, under such conditions, a more accurate method for detecting plant N status should be used.
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Claims 10
Claim · model-written summary
Tuber yields were similar under the two SPAD nitrogen managements.
- Taxon
- Potato
Solanum tuberosumt0 - Outcome
- Tuber yieldse0
- Direction
- similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tuber yields were similar in both SPAD‐based managements”
t0“potato”
Claim · model-written summary
Under favorable rainfall, SPAD management reduced nitrogen applications by 38–63%.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- SPAD‐based managementse0
- Outcome
- N applicationse0
- Direction
- reducede0
- Value
- 38–63%e0
- Qualifier
- Under no intensive rainfall events after N applicationse0
- Comparator
- conventional N fertilizatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under no intensive rainfall events after N applications, SPAD‐based managements reduced N applications by 38–63% and resulted in comparable tuber set, bulking, and yield relative to conventional N fertilization”
t0“potato”
Claim · model-written summary
Under favorable rainfall, SPAD management gave comparable tuber set, bulking, and yield.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- SPAD‐based managementse0
- Outcome
- tuber set, bulking, and yielde0
- Direction
- comparablee0
- Qualifier
- Under no intensive rainfall events after N applicationse0
- Comparator
- conventional N fertilizatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under no intensive rainfall events after N applications, SPAD‐based managements reduced N applications by 38–63% and resulted in comparable tuber set, bulking, and yield relative to conventional N fertilization”
t0“potato”
Claim · model-written summary
At the 90% NSI threshold, SPAD management improved potato nitrogen-uptake efficiency.
- Taxon
- PotatoSolanum tuberosume0
- Treatment
- SPAD‐based management at a NSI threshold of 90%e0
- Outcome
- N‐uptake efficiencye0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SPAD‐based management at a NSI threshold of 90% resulted in greater potato N‐uptake efficiency and tuber yield per unit of N applied”
Claim · model-written summary
At the 90% NSI threshold, SPAD management improved tuber yield per unit nitrogen.
- Taxon
- PotatoSolanum tuberosume0
- Treatment
- SPAD‐based management at a NSI threshold of 90%e0
- Outcome
- tuber yield per unit of N appliede0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SPAD‐based management at a NSI threshold of 90% resulted in greater potato N‐uptake efficiency and tuber yield per unit of N applied”
Claim · model-written summary
SPAD-502 detected plant nitrogen status under conducive conditions.
- Taxon
- PotatoSolanum tuberosume0
- Outcome
- detecting plant N statuse0
- Qualifier
- when environmental conditions were more conducive for potato productione0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SPAD‐502 sensor was efficient for detecting plant N status when environmental conditions were more conducive for potato production”
Claim · model-written summary
SPAD management reduced application rates under conducive conditions.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- SPAD‐502 sensore0
- Outcome
- application ratese0
- Direction
- reducinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SPAD‐502 sensor was efficient for detecting plant N status when environmental conditions were more conducive for potato production and optimized N management by reducing application rates”
t0“potato”
Claim · model-written summary
With unfavorable weather, SPAD readings failed to guide proper nitrogen fertilization.
- Taxon
- PotatoSolanum tuberosumt0
- Outcome
- proper N fertilizatione0
- Direction
- did not guidee0
- Qualifier
- less favorable temperature and solar radiatione0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with less favorable temperature and solar radiation for potato cultivation, and with intensive rainfall events following N application, SPAD readings did not guide to a proper N fertilization and resulted in reduced tuber yield”
t0“potato”
Claim · model-written summary
Under unfavorable weather and rainfall, SPAD management reduced tuber yield.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- SPAD readingse0
- Outcome
- tuber yielde0
- Direction
- reducede0
- Qualifier
- intensive rainfall events following N applicatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with less favorable temperature and solar radiation for potato cultivation, and with intensive rainfall events following N application, SPAD readings did not guide to a proper N fertilization and resulted in reduced tuber yield”
t0“potato”
Claim · model-written summary
Authors recommend a more accurate nitrogen-status method under unfavorable conditions.
- Taxon
- PotatoSolanum tuberosumt0
- Outcome
- a more accurate method for detecting plant N status should be usede0
- Qualifier
- under such conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under such conditions, a more accurate method for detecting plant N status should be used”
t0“potato”
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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.