Abstract
Proper N management is essential to prevent N losses and ensure high potato ( Solanum tuberosum L.) yield and quality. Controlled‐release urea (CRU) could increase nitrogen use efficiency (NUE) by matching the release of N with potato N uptake. This 3‐yr study conducted in Quebec, Canada, compared four treatments, namely an unfertilized control (0 N), calcium ammonium nitrate (CAN) application at rates of 150 kg N ha −1 (150CAN) and 200 kg N ha −1 (200CAN), and CRU application at a rate of 150 kg N ha −1 (150CRU). The effects of treatments were assessed on potato yield, specific gravity, NUE, and chlorophyll meter readings (CMR) for two cultivars (Goldrush and Chieftain) along with soil nitrate adsorbed on anion exchange membranes (NO 3AEMs ). Marketable yield and the yield of jumbo and medium size classes significantly increased with N fertilization up to 150 kg N ha −1 , and yields were higher with 150CRU than with 150CAN or 200CAN. Nitrogen fertilization increased CMR, but had no effect on specific gravity. The CRU continually released more nitrate during the growing season as indicated by higher NO 3AEMs values, and had higher NUE compared with other treatments. Relative yield (RY) was significantly related by linear‐plateau functions to CMR and NO 3AEMs measured 40 to 50 d after planting, hence providing the critical values of 41.9 for CMR and 15 μg cm −2 d −1 for NO 3AEMs , above which the probability of a yield response to additional N is low. Controlled‐release urea is a promising N source for increasing the yield and NUE of potatoes produced in eastern Canada.
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Claims 10
Claim · model-written summary
Marketable yield and the yield of jumbo and medium size classes significantly increased with N fertilization up to 150 kg N/ha in potato.
- Taxon
- potato
Solanum tuberosume0 - Material
- Goldrush and Chieftaine3
- Treatment
- N fertilization up to 150 kg N ha −1e1
- Outcome
- Marketable yield and the yield of jumbo and medium size classese1
- Direction
- increasede1
- Comparator
- unfertilized control (0 N)e2
- Setting
- Quebec, Canadae4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Proper N management is essential to prevent N losses and ensure high potato ( Solanum tuberosum L.) yield and quality”
e1“Marketable yield and the yield of jumbo and medium size classes significantly increased with N fertilization up to 150 kg N ha −1”
e2“compared four treatments, namely an unfertilized control (0 N)”
e3“for two cultivars (Goldrush and Chieftain)”
e4“study conducted in Quebec, Canada”
Claim · model-written summary
Yields were higher with CRU at 150 kg N/ha than with CAN at 150 or 200 kg N/ha in potato.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- CRU application at a rate of 150 kg N ha −1e5
- Outcome
- yieldse6
- Direction
- highere6
- Comparator
- 150CAN or 200CANe6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Proper N management is essential to prevent N losses and ensure high potato ( Solanum tuberosum L.) yield and quality”
e5“CRU application at a rate of 150 kg N ha −1 (150CRU)”
e6“yields were higher with 150CRU than with 150CAN or 200CAN”
Claim · model-written summary
Nitrogen fertilization increased chlorophyll meter readings (CMR) in potato relative to the unfertilized control.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- Nitrogen fertilizatione7
- Outcome
- CMRe7
- Direction
- increasede7
- Comparator
- unfertilized control (0 N)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Proper N management is essential to prevent N losses and ensure high potato ( Solanum tuberosum L.) yield and quality”
e7“Nitrogen fertilization increased CMR, but had no effect on specific gravity”
e2“compared four treatments, namely an unfertilized control (0 N)”
Claim · model-written summary
Nitrogen fertilization had no effect on the specific gravity of potato tubers relative to the unfertilized control.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- Nitrogen fertilizatione7
- Outcome
- specific gravitye7
- Direction
- no effecte7
- Comparator
- unfertilized control (0 N)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Proper N management is essential to prevent N losses and ensure high potato ( Solanum tuberosum L.) yield and quality”
e7“Nitrogen fertilization increased CMR, but had no effect on specific gravity”
e2“compared four treatments, namely an unfertilized control (0 N)”
Claim · model-written summary
The CRU released more nitrate during the growing season in potato, as indicated by higher soil nitrate adsorbed on anion exchange membranes.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- CRUe1
- Outcome
- nitrate during the growing seasone1
- Direction
- moree1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Proper N management is essential to prevent N losses and ensure high potato ( Solanum tuberosum L.) yield and quality”
e1“The CRU continually released more nitrate during the growing season”
Claim · model-written summary
CRU had higher nitrogen use efficiency (NUE) than the other treatments in potato.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- CRUe1
- Outcome
- NUEe2
- Direction
- highere2
- Comparator
- other treatmentse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Proper N management is essential to prevent N losses and ensure high potato ( Solanum tuberosum L.) yield and quality”
e1“The CRU continually released more nitrate during the growing season”
e2“had higher NUE compared with other treatments”
Claim · model-written summary
Relative yield of potato was significantly related to CMR and soil nitrate, measured 40 to 50 days after planting, by linear-plateau functions.
- Taxon
- potatoSolanum tuberosume0
- Compound
- soil nitratee2
- Outcome
- Relative yielde1
- Qualifier
- measured 40 to 50 d after plantinge1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Proper N management is essential to prevent N losses and ensure high potato ( Solanum tuberosum L.) yield and quality”
e1“Relative yield (RY) was significantly related by linear‐plateau functions to CMR and NO 3AEMs measured 40 to 50 d after planting”
e2“soil nitrate adsorbed on anion exchange membranes”
Claim · model-written summary
A CMR value of 41.9 is the critical value above which the probability of a potato yield response to additional N is low.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- critical valuese1
- Value
- 41.9e1
- Qualifier
- above which the probability of a yield response to additional N is lowe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Proper N management is essential to prevent N losses and ensure high potato ( Solanum tuberosum L.) yield and quality”
e1“critical values of 41.9 for CMR”
e2“above which the probability of a yield response to additional N is low”
Claim · model-written summary
A NO3AEMs value of 15 μg cm −2 d −1 is the critical value above which the probability of a potato yield response to additional N is low.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- critical valuese3
- Value
- 15 μg cm −2 d −1e3
- Qualifier
- above which the probability of a yield response to additional N is lowe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Proper N management is essential to prevent N losses and ensure high potato ( Solanum tuberosum L.) yield and quality”
e3“critical values of 41.9 for CMR and 15 μg cm −2 d −1 for NO3AEMs”
e2“above which the probability of a yield response to additional N is low”
Claim · model-written summary
Controlled-release urea is a promising N source for increasing the yield and NUE of potatoes produced in eastern Canada.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- promising N source for increasing the yield and NUE of potatoese1
- Setting
- eastern Canadae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Proper N management is essential to prevent N losses and ensure high potato ( Solanum tuberosum L.) yield and quality”
e1“is a promising N source for increasing the yield and NUE of potatoes produced in eastern Canada”
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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.