Abstract
Abstract Applying N in sprinkler H 2 O during June and July was compared with topdressing earlier at thinning for sugarbeets ( Beta vulgaris L.) grown in a split‐plot experiment with high‐frequency irrigation treatments of 50, 75, and 100% replacement of evapotranspiration (ET). Nitrogen was applied preplant at a rate of 70 kg/ha in all treatments. Sprinkling N too late in July significantly decreased sucrose content, averaged over N rates of 112, 224, and 336 kg/ha and moisture regimes, to 17.2% compared with 17.7% for topdressed N. Sugarbeet yield and percent sucrose at each combination of N rate and irrigation regime were similar with both methods of supplemental N application. Deficit irrigation (50 or 75% ET replacement) gave significantly higher sucrose percentages than full (100%) replacement, but the 50% ET‐replacement regime decreased beet yields by 10 metric tons/ha for a net loss of sugar yield. The optimum N rate was 224 kg/ha, with petiole NO 3 ‐N averaging just under 1% at the end of July and approaching 0.1% by the end of August. Results show that sugarbeet yields were only slightly lower, with two thirds of the total N at the optimum N rate applied in sprinkler H 2 O than by topdressing at thinning in early June. However, percent sucrose was significantly lower with N applications in sprinkler H 2 O, which resulted in much lower sugar yields with delayed N applications.
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Claims 12
Claim · model-written summary
Late July sprinkler nitrogen reduced sucrose content to 17.2%, versus 17.7% with topdressing.
- Taxon
- sugarbeets
Beta vulgaris subsp. vulgarist0 - Treatment
- Sprinkling N too late in Julye0
- Outcome
- sucrose contente0
- Direction
- decreasede0
- Value
- 17.2%e0
- Qualifier
- 17.7%e0
- Comparator
- topdressed Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sprinkling N too late in July significantly decreased sucrose content, averaged over N rates of 112, 224, and 336 kg/ha and moisture regimes, to 17.2% compared with 17.7% for topdressed N”
t0“for sugarbeets ( Beta vulgaris L.)”
Claim · model-written summary
Sugarbeet yield was similar between supplemental nitrogen methods at each N rate and irrigation regime.
- Taxon
- SugarbeetBeta vulgaris subsp. vulgarist0
- Treatment
- both methods of supplemental N applicatione0
- Outcome
- Sugarbeet yielde0
- Direction
- similare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sugarbeet yield and percent sucrose at each combination of N rate and irrigation regime were similar with both methods of supplemental N application”
t0“Sugarbeet”
Claim · model-written summary
Percent sucrose was similar between supplemental nitrogen methods at each N rate and irrigation regime.
- Taxon
- SugarbeetBeta vulgaris subsp. vulgarist0
- Treatment
- both methods of supplemental N applicatione0
- Outcome
- percent sucrosee0
- Direction
- similare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sugarbeet yield and percent sucrose at each combination of N rate and irrigation regime were similar with both methods of supplemental N application”
t0“Sugarbeet”
Claim · model-written summary
Deficit irrigation gave higher sucrose percentages than full ET replacement.
- Taxon
- SugarbeetBeta vulgaris subsp. vulgarist0
- Treatment
- Deficit irrigation (50 or 75% ET replacement)e0
- Outcome
- sucrose percentagese0
- Direction
- highere0
- Comparator
- full (100%) replacemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Deficit irrigation (50 or 75% ET replacement) gave significantly higher sucrose percentages than full (100%) replacement”
t0“Sugarbeet”
Claim · model-written summary
The 50% ET replacement regime reduced beet yields by 10 metric tons/ha.
- Taxon
- SugarbeetBeta vulgaris subsp. vulgarist0
- Treatment
- 50% ET‐replacement regimee0
- Outcome
- beet yieldse0
- Direction
- decreasede0
- Value
- 10 metric tons/hae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the 50% ET‐replacement regime decreased beet yields by 10 metric tons/ha for a net loss of sugar yield”
t0“Sugarbeet”
Claim · model-written summary
The 50% ET replacement regime caused a net loss of sugar yield.
- Taxon
- SugarbeetBeta vulgaris subsp. vulgarist0
- Treatment
- 50% ET‐replacement regimee0
- Outcome
- sugar yielde0
- Direction
- losse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the 50% ET‐replacement regime decreased beet yields by 10 metric tons/ha for a net loss of sugar yield”
t0“Sugarbeet”
Claim · model-written summary
The reported optimum N rate was 224 kg/ha.
- Taxon
- SugarbeetBeta vulgaris subsp. vulgarist0
- Outcome
- optimum N ratee0
- Value
- 224 kg/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The optimum N rate was 224 kg/ha”
t0“Sugarbeet”
Claim · model-written summary
At the optimum N rate, petiole nitrate N was just under 1% at July end.
- Taxon
- SugarbeetBeta vulgaris subsp. vulgarist0
- Organ / stage
- petiolee0
- Outcome
- petiole NO 3 ‐Ne0
- Value
- just under 1%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“petiole NO 3 ‐N averaging just under 1% at the end of July”
t0“Sugarbeet”
Claim · model-written summary
At the optimum N rate, petiole nitrate N approached 0.1% at August end.
- Taxon
- SugarbeetBeta vulgaris subsp. vulgarise1
- Outcome
- petiole NO 3 ‐Nt0
- Value
- 0.1%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“approaching 0.1% by the end of August”
t0“petiole NO 3 ‐N averaging just under 1% at the end of July”
e1“Sugarbeet Response”
Claim · model-written summary
Sprinkler application of two thirds of optimum N gave only slightly lower sugarbeet yields than early topdressing.
- Taxon
- sugarbeetBeta vulgaris subsp. vulgarise0
- Treatment
- two thirds of the total N at the optimum N rate applied in sprinkler H 2 Oe0
- Outcome
- sugarbeet yieldse0
- Direction
- lowere0
- Comparator
- topdressing at thinning in early Junee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sugarbeet yields were only slightly lower, with two thirds of the total N at the optimum N rate applied in sprinkler H 2 O than by topdressing at thinning in early June”
Claim · model-written summary
Sprinkler nitrogen application significantly lowered percent sucrose.
- Taxon
- SugarbeetBeta vulgaris subsp. vulgarist0
- Treatment
- N applications in sprinkler H 2 Oe0
- Outcome
- percent sucrosee0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“percent sucrose was significantly lower with N applications in sprinkler H 2 O”
t0“Sugarbeet”
Claim · model-written summary
Delayed nitrogen application produced much lower sugar yields.
- Taxon
- SugarbeetBeta vulgaris subsp. vulgarist0
- Treatment
- delayed N applicationse0
- Outcome
- sugar yieldse0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“much lower sugar yields with delayed N applications”
t0“Sugarbeet”
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