Abstract
This study evaluated the impacts of crop rotations and nitrogen (N) fertilizer management on potato yield and greenhouse gas (GHG: N 2 O, CO 2 , and CH 4 ) emissions during the potato ( Solanum tuberosum L.) phase. Three rotation systems were compared: (i) barley ( Hordeum vulgare L.) underseeded with a forage legume–forage legume–potatoes (B–FL–P); (ii) corn ( Zea mays L.)–sorghum Sudan grass ( Sorghum bicolor × sorghum bicolor var. Sudanese)–potatoes (C–SS–P); and (iii) soybean ( Glycine max)–brown mustard ( Brassica juncea L.)–potatoes (S–BM–P). An experimental design established at two adjacent sites in 2015 was used. In 2024 at site A, during the potato phase, the main plot was split into two to compare urea at 160 kg N ha −1 with 120 kg N ha −1 as super urea (Super U), whereas urea at 160 kg N ha −1 was compared with reduced urea at 120 kg N ha −1 at site B. At both sites, reducing N rates by 25% did not impact potato marketable yield. At site A, B–FL–P had significantly higher N 2 O emissions than other rotations. Super U at a reduced rate had 5.7 times lower total N 2 O emissions than urea at the recommended rate. At site B, S–BM–P had 66% lower total N 2 O emissions than B–FL–P and 50% lower than C–SS–P. Current N recommendations could be reduced without impacting potato yields with Super U being more effective in mitigating N 2 O than urea. Correlations between GHG with soil moisture and temperature and with mineral N are discussed.
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Claims 6
Claim · model-written summary
Reducing N rates by 25% did not affect marketable potato yield relative to urea at 160 kg N ha −1.
- Taxon
- Solanum tuberosum L.
Solanum tuberosume0 - Treatment
- reducing N rates by 25%e1
- Outcome
- potato marketable yielde1
- Direction
- did not impacte1
- Comparator
- urea at 160 kg N ha −1e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“potato ( Solanum tuberosum L.) phase”
e1“reducing N rates by 25% did not impact potato marketable yield”
e2“compare urea at 160 kg N ha −1 with 120 kg N ha −1 as super urea (Super U)”
Claim · model-written summary
At site A, the B–FL–P rotation had higher N2O emissions than other rotations.
- Taxon
- Solanum tuberosum L.Solanum tuberosume0
- Treatment
- B–FL–Pe3
- Outcome
- N 2 O emissionse3
- Direction
- highere3
- Comparator
- other rotationse3
- Setting
- site Ae3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“potato ( Solanum tuberosum L.) phase”
e3“At site A, B–FL–P had significantly higher N 2 O emissions than other rotations”
Claim · model-written summary
Super U at a reduced rate had 5.7 times lower total N2O emissions than urea at the recommended rate.
- Taxon
- Solanum tuberosum L.Solanum tuberosume0
- Treatment
- Super U at a reduced ratee4
- Outcome
- total N 2 O emissionse4
- Direction
- lowere4
- Value
- 5.7 timese4
- Comparator
- urea at the recommended ratee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“potato ( Solanum tuberosum L.) phase”
e4“Super U at a reduced rate had 5.7 times lower total N 2 O emissions than urea at the recommended rate”
Claim · model-written summary
At site B, the S–BM–P rotation had 66% lower total N2O emissions than B–FL–P.
- Taxon
- Solanum tuberosum L.Solanum tuberosume0
- Treatment
- S–BM–Pe5
- Outcome
- total N 2 O emissionse5
- Direction
- lowere5
- Value
- 66%e5
- Comparator
- B–FL–Pe5
- Setting
- site Be5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“potato ( Solanum tuberosum L.) phase”
e5“At site B, S–BM–P had 66% lower total N 2 O emissions than B–FL–P and 50% lower than C–SS–P”
Claim · model-written summary
At site B, the S–BM–P rotation had 50% lower total N2O emissions than C–SS–P.
- Taxon
- Solanum tuberosum L.Solanum tuberosume0
- Treatment
- S–BM–Pe5
- Outcome
- total N 2 O emissionse5
- Direction
- lowere5
- Value
- 50%e5
- Comparator
- C–SS–Pe5
- Setting
- site Be5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“potato ( Solanum tuberosum L.) phase”
e5“At site B, S–BM–P had 66% lower total N 2 O emissions than B–FL–P and 50% lower than C–SS–P”
Claim · model-written summary
Current N recommendations for potato could be reduced without impacting potato yields.
- Taxon
- potatoSolanum tuberosume6
- Outcome
- Current N recommendations could be reducede6
- Qualifier
- without impacting potato yieldse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Current N recommendations could be reduced without impacting potato yields”
The same questions in other papers
nitrogen · quality: postharvest · Solanum tuberosum (potato)Positive and negative results
4 papers in the same direction as this paper · 23 reporting no difference from an alternative
- positive
- positive
- positive
24 papers more in this group
See all 28 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.