Abstract
Single fertilizer nitrogen rate of 146 kg N ha −1 for sugarbeet is outdated. Sugarbeet–fertilizer nitrogen recommendation should consider soil characteristics. Sugarbeet yield and sugar content was optimized at 112 kg N ha −1 . In‐season soil nitrogen and red‐edge normalized difference vegetative index can predict yield response to nitrogen. Economic optimum nitrogen rate varies from 0 to 405 kg N ha −1 . Fertilizer N application is critical to optimize sugarbeet ( Beta vulgaris L.) yield and sugar concentration. Regardless of observed yields, current fertilizer recommendations in North Dakota and Minnesota suggest a single application rate of 146 kg N ha −1 (considering both fertilizer N residual soil N of 120 cm depth) for the Red River Valley (RRV) irrespective of soil type and organic matter content. Field experiments were conducted at three sites to determine sugarbeet response to N application rates, 0, 112, 146, 179, and 213 kg N ha −1 and optimal N rate during 2015 and 2016 growing seasons. Year and site had a significant effect on yield and sugar concentration. In 2015, fertilizer‐N significantly increased yield for all three sites, but in 2016, only one site responded to N. The highest N rate (213 kg N ha −1 ) reduced sugar concentration in 2016. In‐season soil available N (of 0–120 cm) significantly correlated with yield ( R 2 = 0.35) and economic return ( R 2 = 0.28). In season, red edge normalized difference vegetative index (RENDVI) based on the handheld optical sensor was significantly ( P < 0.05) related to fertilizer‐N application rate. Economic optimum N rate for three sites varied from 0 to 405 kg N ha −1 depending on year and site characteristics. Our results suggest a revision of current sugarbeet fertilizer N recommendation to replace the single rate with N rates based on site characteristics and profitability to N applications.
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Claims 9
Claim · model-written summary
Sugarbeet yield and sugar concentration differed significantly by year and site.
- Taxon
- Sugarbeet
Beta vulgaris subsp. vulgarist0 - Outcome
- yield and sugar concentratione0
- Setting
- sitee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Year and site had a significant effect on yield and sugar concentration.”
t0“Sugarbeet”
Claim · model-written summary
Nitrogen fertilizer significantly raised sugarbeet yield at all three sites in 2015.
- Taxon
- SugarbeetBeta vulgaris subsp. vulgarist0
- Treatment
- fertilizer‐Ne0
- Outcome
- yielde0
- Direction
- increasede0
- Setting
- all three sitese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 2015, fertilizer‐N significantly increased yield for all three sites”
t0“Sugarbeet”
Claim · model-written summary
Only one sugarbeet site responded to nitrogen in 2016.
- Taxon
- SugarbeetBeta vulgaris subsp. vulgarist0
- Outcome
- only one site responded to Ne0
- Setting
- one sitee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but in 2016, only one site responded to N”
t0“Sugarbeet”
Claim · model-written summary
The highest nitrogen rate reduced sugar concentration in 2016.
- Taxon
- SugarbeetBeta vulgaris subsp. vulgarist0
- Treatment
- 213 kg N ha −1e0
- Outcome
- sugar concentratione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest N rate (213 kg N ha −1 ) reduced sugar concentration in 2016.”
t0“Sugarbeet”
Claim · model-written summary
In-season soil available nitrogen correlated significantly with yield, R² = 0.35.
- Taxon
- SugarbeetBeta vulgaris subsp. vulgarist0
- Treatment
- soil available Ne0
- Outcome
- yielde0
- Value
- R 2 = 0.35e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In‐season soil available N (of 0–120 cm) significantly correlated with yield ( R 2 = 0.35) and economic return ( R 2 = 0.28).”
t0“Sugarbeet”
Claim · model-written summary
In-season soil available nitrogen correlated significantly with economic return, R² = 0.28.
- Taxon
- SugarbeetBeta vulgaris subsp. vulgarist0
- Treatment
- soil available Ne0
- Outcome
- economic returne0
- Value
- R 2 = 0.28e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In‐season soil available N (of 0–120 cm) significantly correlated with yield ( R 2 = 0.35) and economic return ( R 2 = 0.28).”
t0“Sugarbeet”
Claim · model-written summary
Sensor RENDVI was significantly related to nitrogen application rate.
- Taxon
- SugarbeetBeta vulgaris subsp. vulgarist0
- Treatment
- fertilizer‐N application ratee0
- Outcome
- red edge normalized difference vegetative index (RENDVI)e0
- Value
- P < 0.05e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“red edge normalized difference vegetative index (RENDVI) based on the handheld optical sensor was significantly ( P < 0.05) related to fertilizer‐N application rate”
t0“Sugarbeet”
Claim · model-written summary
Economic optimum nitrogen rates ranged from 0 to 405 kg N per hectare across sites and years.
- Taxon
- SugarbeetBeta vulgaris subsp. vulgarist0
- Outcome
- Economic optimum N ratee0
- Value
- 0 to 405 kg N ha −1e0
- Setting
- three sitese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Economic optimum N rate for three sites varied from 0 to 405 kg N ha −1 depending on year and site characteristics.”
t0“Sugarbeet”
Claim · model-written summary
The authors recommend site-specific nitrogen rates based on site characteristics and profitability.
- Taxon
- sugarbeetBeta vulgaris subsp. vulgarist0
- Outcome
- N rates based on site characteristics and profitabilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“replace the single rate with N rates based on site characteristics and profitability to N applications”
t0“sugarbeet”
The same questions in other papers
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See all 267 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.