Abstract
The preference of potato plants for specific nitrogen (N) form changes with growth stage. Potato plants prefer nitrate N before tuber formation, while they favor ammonium N after tuber formation. However, few studies have focused on N species management in potato production. In this study, 2-year field experiments were conducted from 2020 to 2021 in Inner Mongolia, China, under drip irrigation with four N treatments: (1) CK (no N was used), (2) conventional farming practices (F) (urea was the only N source applied for potato growth), (3) nitrate N supplied before tuber formation and ammonium N with nitrification inhibitor supplied after tuber formation (N-NI), and (4) nitrate N supplied before tuber formation and frequent, low-dose ammonium N applied after tuber formation (Opt). The results demonstrated that, compared with the F, the Opt treatment facilitated potato N uptake, with a 33-40% increase in plant N accumulation, and significantly increased potato growth, which ultimately resulted in a yield increase of 12-20% and an increase of 11-22 percentage units in NUE. In addition, the Opt treatment reduced the soil N residual by ~14% after harvest. Compared with the N-NI, the Opt treatment did not result in a decrease in tuber yield or NUE. Therefore, supplying nitrate N before tuber formation and frequent, low-dose ammonium N after tuber formation can result in a better match between the supply and demand of potato plants for N forms without the use of nitrification inhibitors, improving both potato yield and NUE, which is of substantial agronomic and environmental value.
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Claims 7
Claim · model-written summary
The Opt treatment increased potato plant N accumulation by 33-40% compared with the F treatment.
- Taxon
- potato
Solanum tuberosume0 - Treatment
- nitrate N supplied before tuber formation and frequent, low-dose ammonium N applied after tuber formatione1
- Outcome
- plant N accumulatione0
- Direction
- increasee0
- Value
- 33-40%e0
- Comparator
- the Fe0
- Setting
- Inner Mongolia, Chinae2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared with the F, the Opt treatment facilitated potato N uptake, with a 33-40% increase in plant N accumulation”
e1“nitrate N supplied before tuber formation and frequent, low-dose ammonium N applied after tuber formation (Opt)”
e2“2-year field experiments were conducted from 2020 to 2021 in Inner Mongolia, China”
Claim · model-written summary
The Opt treatment significantly increased potato growth compared with the F treatment.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- nitrate N supplied before tuber formation and frequent, low-dose ammonium N applied after tuber formatione2
- Outcome
- potato growthe1
- Direction
- increasede1
- Comparator
- the Fe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared with the F, the Opt treatment facilitated potato N uptake, with a 33-40% increase in plant N accumulation”
e1“significantly increased potato growth”
e2“nitrate N supplied before tuber formation and frequent, low-dose ammonium N applied after tuber formation (Opt)”
Claim · model-written summary
The Opt treatment increased potato tuber yield by 12-20% compared with the F treatment.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- nitrate N supplied before tuber formation and frequent, low-dose ammonium N applied after tuber formatione2
- Outcome
- yielde1
- Direction
- increasee1
- Value
- 12-20%e1
- Comparator
- the Fe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared with the F, the Opt treatment facilitated potato N uptake, with a 33-40% increase in plant N accumulation”
e1“resulted in a yield increase of 12-20%”
e2“nitrate N supplied before tuber formation and frequent, low-dose ammonium N applied after tuber formation (Opt)”
Claim · model-written summary
The Opt treatment increased nitrogen use efficiency by 11-22 percentage units compared with the F treatment.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- nitrate N supplied before tuber formation and frequent, low-dose ammonium N applied after tuber formatione2
- Outcome
- NUEe1
- Direction
- increasee1
- Value
- 11-22 percentage unitse1
- Comparator
- the Fe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared with the F, the Opt treatment facilitated potato N uptake, with a 33-40% increase in plant N accumulation”
e1“an increase of 11-22 percentage units in NUE”
e2“nitrate N supplied before tuber formation and frequent, low-dose ammonium N applied after tuber formation (Opt)”
Claim · model-written summary
The Opt treatment reduced soil N residual by about 14 percent after harvest.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- nitrate N supplied before tuber formation and frequent, low-dose ammonium N applied after tuber formatione2
- Outcome
- soil N residuale1
- Direction
- reducede1
- Value
- ~14%e1
- Qualifier
- after harveste1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared with the F, the Opt treatment facilitated potato N uptake, with a 33-40% increase in plant N accumulation”
e1“the Opt treatment reduced the soil N residual by ~14% after harvest”
e2“nitrate N supplied before tuber formation and frequent, low-dose ammonium N applied after tuber formation (Opt)”
Claim · model-written summary
The Opt treatment did not decrease tuber yield or NUE compared with the N-NI treatment.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- Opt treatmente1
- Outcome
- tuber yield or NUEe1
- Direction
- did not result in a decreasee1
- Comparator
- N-NIe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared with the F, the Opt treatment facilitated potato N uptake, with a 33-40% increase in plant N accumulation”
e1“Compared with the N-NI, the Opt treatment did not result in a decrease in tuber yield or NUE”
Claim · model-written summary
Supplying nitrate N before tuber formation and frequent low-dose ammonium N after it is recommended to improve potato yield and NUE without nitrification inhibitors.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- supplying nitrate N before tuber formation and frequent, low-dose ammonium N after tuber formatione0
- Outcome
- improving both potato yield and NUEe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“supplying nitrate N before tuber formation and frequent, low-dose ammonium N after tuber formation can result in a better match between the supply and demand of potato plants for N forms without the use of nitrification inhibitors, improving both potato yield and NUE”
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