Abstract
In this study, a simple logistic model was developed for estimating total dry matter of sugar beet under different irrigation and nitrogen levels. The experiment was conducted using line source sprinkler irrigation in 2013 and furrow irrigation in 2014. Irrigation treatments were from 44% to 130% of full irrigation and applied nitrogen treatments ranged from 0 to 240 kg N ha-1. Results showed that the model was more accurate in predicting total dry matter at harvest date with the Normalized Root Mean Square Error (NRMSE) amounting to almost 10 percent. After total dry matter estimation, a model was needed for dry matter partitioning between different organs of sugar beet. To achieve this goal, another logistic model was developed and was compared with three revised models. Finally, white sugar content of root dry matter was estimated using a quadratic equation as a function of applied water and nitrogen. Validation results indicated that total and root dry matters, and white sugar yield were estimated fairly well. Results showed that excessive water had negative effects on total dry matter and root dry matter. Also, excessive nitrogen affected root dry matter negatively too, but even the excess had positive effects on total dry matter. In contrast to common belief, our results showed that drought stress reduced both ratios of root to leaf, and root to shoot dry matter.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
A logistic model predicted total dry matter at harvest with NRMSE near 10 percent.
- Taxon
- sugar beet
Beta vulgaris subsp. vulgarist0 - Outcome
- total dry matter at harvest datee0
- Direction
- more accuratee0
- Value
- almost 10 percente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the model was more accurate in predicting total dry matter at harvest date with the Normalized Root Mean Square Error (NRMSE) amounting to almost 10 percent”
t0“Sugar Beet”
Claim · model-written summary
Validation indicated fairly good estimation of total dry matter, root dry matter and white sugar yield.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Outcome
- total and root dry matters, and white sugar yielde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“total and root dry matters, and white sugar yield were estimated fairly well”
t0“Sugar Beet”
Claim · model-written summary
Excessive water reduced total dry matter.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- excessive watere0
- Outcome
- total dry mattere0
- Direction
- negative effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“excessive water had negative effects on total dry matter and root dry matter”
t0“Sugar Beet”
Claim · model-written summary
Excessive water reduced root dry matter.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- excessive watere0
- Outcome
- root dry mattere0
- Direction
- negative effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“excessive water had negative effects on total dry matter and root dry matter”
t0“Sugar Beet”
Claim · model-written summary
Excessive nitrogen negatively affected root dry matter.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- excessive nitrogene0
- Outcome
- root dry mattere0
- Direction
- negativelye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“excessive nitrogen affected root dry matter negatively too, but even the excess had positive effects on total dry matter”
t0“Sugar Beet”
Claim · model-written summary
Excessive nitrogen positively affected total dry matter.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- excessive nitrogene0
- Outcome
- total dry mattere0
- Direction
- positive effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“excessive nitrogen affected root dry matter negatively too, but even the excess had positive effects on total dry matter”
t0“Sugar Beet”
Claim · model-written summary
Drought reduced root-to-leaf dry matter ratio.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- drought stresse0
- Outcome
- ratios of root to leafe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought stress reduced both ratios of root to leaf, and root to shoot dry matter”
t0“Sugar Beet”
Claim · model-written summary
Drought reduced root-to-shoot dry matter ratio.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarist0
- Treatment
- drought stresse0
- Outcome
- root to shoot dry mattere0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought stress reduced both ratios of root to leaf, and root to shoot dry matter”
t0“Sugar Beet”
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