Abstract
The critical nitrogen (N) dilution curve is widely used to diagnose crop N status, but no such model has been developed for sugar beet. This study evaluated the effects of irrigation amount and N rate on sugar yield, N use efficiency, and soil nitrate-N (NO3-N) residue of drip-fertigated sugar beet in the arid southern Xinjiang of China. A reliable N nutrition index (NNI) for sugar yield was also established based on a critical N dilution curve derived from the dry matter of sugar beet. A three-year field experiment was established with six N rates (25–480 kg N ha−1) and three irrigation levels based on crop evapotranspiration (ETc) (0.6, 0.8, and 1.0 ETc in 2019 and 2020, and 0.4, 0.6, and 0.8 ETc in 2021). Results showed that sugar yield and N uptake increased and then generally stabilized with increasing N rate, while N use efficiency decreased. Most soil NO3-N was mainly distributed in the 0–60 cm soil layer, but increasing irrigation amount reduced residual NO3-N in the 0–80 cm soil layer. Additionally, the established critical N dilution curve of sugar beet was considered stable (Normalized RMSE = 16.6%), and can be used to calculate plant N requirements and further N rates during sugar beet growth. The results indicated that the optimal NNI was 0.97 under 0.6 ETc for sugar yield production of sugar beet in this study. This study provides a basis for efficient water and N management in sugar beet production in arid and semi-arid regions globally.
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 7
Claim · model-written summary
Sugar yield increased then generally stabilized as N rate rose.
- Taxon
- sugar beet
Beta vulgaris subsp. vulgarise1 - Treatment
- increasing N ratee0
- Outcome
- sugar yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results showed that sugar yield and N uptake increased and then generally stabilized with increasing N rate, while N use efficiency decreased.”
e1“dry matter of sugar beet”
Claim · model-written summary
N uptake increased then generally stabilized as N rate rose.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarise1
- Treatment
- increasing N ratee0
- Outcome
- N uptakee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results showed that sugar yield and N uptake increased and then generally stabilized with increasing N rate, while N use efficiency decreased.”
e1“dry matter of sugar beet”
Claim · model-written summary
N use efficiency decreased as N rate rose.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarise1
- Treatment
- increasing N ratee0
- Outcome
- N use efficiencye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results showed that sugar yield and N uptake increased and then generally stabilized with increasing N rate, while N use efficiency decreased.”
e1“dry matter of sugar beet”
Claim · model-written summary
Most soil nitrate nitrogen was in the 0–60 cm layer.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarise1
- Outcome
- soil NO3-Ne0
- Direction
- mainly distributede0
Not reportedOrgan / stage
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Most soil NO3-N was mainly distributed in the 0–60 cm soil layer, but increasing irrigation amount reduced residual NO3-N in the 0–80 cm soil layer.”
e1“dry matter of sugar beet”
Claim · model-written summary
Increased irrigation reduced residual soil nitrate nitrogen in the 0–80 cm layer.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarise1
- Treatment
- increasing irrigation amounte0
- Outcome
- residual NO3-Ne0
- Direction
- reducede0
- Qualifier
- 0–80 cm soil layere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Most soil NO3-N was mainly distributed in the 0–60 cm soil layer, but increasing irrigation amount reduced residual NO3-N in the 0–80 cm soil layer.”
e1“dry matter of sugar beet”
Claim · model-written summary
The sugar beet critical N dilution curve was considered stable, with normalized RMSE 16.6%.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarise0
- Outcome
- critical N dilution curvee0
- Value
- 16.6%e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Additionally, the established critical N dilution curve of sugar beet was considered stable (Normalized RMSE = 16.6%), and can be used to calculate plant N requirements and further N rates during sugar beet growth.”
Claim · model-written summary
The optimal NNI for sugar yield was 0.97 under 0.6 ETc.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarise0
- Treatment
- 0.6 ETce0
- Outcome
- optimal NNIe0
- Value
- 0.97e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results indicated that the optimal NNI was 0.97 under 0.6 ETc for sugar yield production of sugar beet in this study.”
The same questions in other papers
nitrogen · quality: sugar starch · Beta vulgaris (beet)Results differ
65 papers in the same direction as this paper · 36 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- negative
99 papers more in this group
See all 103 papers →nitrogen · nutrient: efficiency · Beta vulgaris (beet)Positive and negative results
5 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
3 papers more in this group
See all 7 papers →nitrogen · nutrient: content · Beta vulgaris (beet)Positive and negative results
22 papers in the same direction as this paper · 8 in the opposite direction
- no effect
- negative
- negative
27 papers more in this group
See all 31 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.