Abstract
Potato has become one of the staple crops to improve food security in North Korea since the late 1990s. However, the potato yield has been stagnated around 11–12 t ha−1 for several decades, and a food shortage is still a primary issue in North Korea. Yield gap analyses were carried out using the SUBSTOR-potato model to quantify the potato yield gaps and explore the potential ways to close the yield gaps in two different cropping seasons in North Korea (early- and main-season potatoes). Yield gaps were estimated to be around 80% for both early- and main-season potatoes. Early-season potato yield was substantially determined by water or nitrogen supplies, depending on the year’s weather condition (i.e., with or without spring drought). Irrigation during the vegetative stage could effectively reduce the year-to-year variation in yield as well as the yield gap (+7.0 t ha−1, +66.1%). Meanwhile, additional nitrogen fertilizer in the early-season potatoes was less effective compared to that in the main-season potatoes. For the main-season potatoes, where precipitation was sufficient, the primary limiting factor of yield was nitrogen supply. Since heavy rainfall aggravated nitrogen leaching, additional nitrogen fertilizer is recommended as a top dressing rather than a basal dressing. Additional top dressing at 50 days after planting with the current amount of nitrogen fertilizer was expected to increase the main-season potato yield by 42.0 t ha−1 (+191.4%). This study highlights that the primary limiting factor of potato yield may differ between the cropping seasons. Therefore, our findings suggest that different agronomic strategies should be applied for different cropping seasons to improve potato production in North Korea, where agronomic resources are limited.
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Claims 10
Claim · model-written summary
Potato yield gaps were about 80% in both early and main seasons.
- Taxon
- potatoes
Solanum tuberosume0 - Outcome
- Yield gapse0
- Value
- around 80%e0
- Setting
- North Koreat0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield gaps were estimated to be around 80% for both early- and main-season potatoes.”
t0“Potato Yield Gaps in North Korea”
Claim · model-written summary
Early-season potato yield was determined by water or nitrogen supply according to spring drought conditions.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- water or nitrogen suppliese0
- Outcome
- potato yielde0
- Qualifier
- with or without spring droughte0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early-season potato yield was substantially determined by water or nitrogen supplies, depending on the year’s weather condition (i.e., with or without spring drought).”
Claim · model-written summary
Vegetative-stage irrigation reduced year-to-year yield variation.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- Irrigation during the vegetative stagee0
- Outcome
- year-to-year variation in yielde0
- Direction
- reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation during the vegetative stage could effectively reduce the year-to-year variation in yield as well as the yield gap (+7.0 t ha−1, +66.1%).”
t0“Potato Yield Gaps in North Korea”
Claim · model-written summary
Vegetative-stage irrigation reduced the yield gap, corresponding to 7.0 t ha−1 and 66.1%.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- Irrigation during the vegetative stagee0
- Outcome
- yield gape0
- Direction
- reducee0
- Value
- +7.0 t ha−1, +66.1%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation during the vegetative stage could effectively reduce the year-to-year variation in yield as well as the yield gap (+7.0 t ha−1, +66.1%).”
t0“Potato Yield Gaps in North Korea”
Claim · model-written summary
Additional nitrogen fertilizer was less effective for early-season than main-season potatoes.
- Taxon
- potatoesSolanum tuberosume0
- Treatment
- additional nitrogen fertilizere0
- Outcome
- less effectivee0
- Direction
- less effectivee0
- Comparator
- main-season potatoese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“additional nitrogen fertilizer in the early-season potatoes was less effective compared to that in the main-season potatoes.”
Claim · model-written summary
Nitrogen supply was the main limiting factor for main-season potato yield.
- Taxon
- potatoesSolanum tuberosume0
- Treatment
- nitrogen supplye0
- Outcome
- yielde0
- Qualifier
- precipitation was sufficiente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For the main-season potatoes, where precipitation was sufficient, the primary limiting factor of yield was nitrogen supply.”
Claim · model-written summary
Heavy rainfall aggravated nitrogen leaching.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- heavy rainfalle0
- Outcome
- nitrogen leachinge0
- Direction
- aggravatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Since heavy rainfall aggravated nitrogen leaching, additional nitrogen fertilizer is recommended as a top dressing rather than a basal dressing.”
t0“Potato Yield Gaps in North Korea”
Claim · model-written summary
The authors recommend additional nitrogen as top dressing rather than basal dressing.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- additional nitrogen fertilizer is recommended as a top dressing rather than a basal dressinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“additional nitrogen fertilizer is recommended as a top dressing rather than a basal dressing.”
t0“Potato Yield Gaps in North Korea”
Claim · model-written summary
Additional top dressing 50 days after planting was expected to raise main-season potato yield by 42.0 t ha−1 or 191.4%.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- Additional top dressing at 50 days after planting with the current amount of nitrogen fertilizere0
- Outcome
- main-season potato yielde0
- Direction
- increasee0
- Value
- 42.0 t ha−1 (+191.4%)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Additional top dressing at 50 days after planting with the current amount of nitrogen fertilizer was expected to increase the main-season potato yield by 42.0 t ha−1 (+191.4%).”
Claim · model-written summary
The authors recommend different agronomic strategies for the two cropping seasons in North Korea.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- different agronomic strategies should be applied for different cropping seasonse0
- Setting
- North Koreae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“different agronomic strategies should be applied for different cropping seasons to improve potato production in North Korea”
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- no effect
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See all 450 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.