Abstract
The in-season trend of onion biomass and its yield depend on the dynamics of nitrogen (N) and sulfur (S) uptake. This hypothesis was verified based on a three-year (2009, 2010, 2011) field study (Poznan University of Life Sciences). The experimental factors consisted of N: 0, 60, 120 and S: 0, 30, 60 kg ha−1. The dynamics of onion total dry weight (TDW), total N uptake (TNU), and total S uptake (TSU) were determined at 10-day intervals. The in-season course of TDW and TNU was best described by the expolinear and TSU by the quadratic growth model. Sulfur uptake increased in onion at day after emergence (DAE) 40, independent of its rate with respect to SN control, resulting in increased N by 50%, and consequently higher yield. The maximum absolute S uptake rate (SCm), a factor defining yield, increased progressively with the N rate, but only in the absence of S application. Plants fertilized simultaneously with S and N showed a more complicated impact on SCm. The N rate of 120 kg ha−1 resulted in SCm reduction, leading to a yield drop. The expolinear model indicated an onion growth disturbance, revealed under unfavorable growth conditions, leading to yield depression.
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Claims 9
Claim · model-written summary
The in-season course of onion total dry weight and total N uptake was best described by the expolinear model, and total S uptake by the quadratic model.
- Taxon
- onion
Allium cepae0 - Outcome
- in-season course of TDW and TNUe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The in-season trend of onion biomass”
e1“The in-season course of TDW and TNU was best described by the expolinear and TSU by the quadratic growth model”
Claim · model-written summary
Sulfur uptake in onion increased at day after emergence 40, independent of S rate relative to the SN control.
- Taxon
- onionAllium cepae1
- Outcome
- Sulfur uptakee1
- Direction
- increasede1
- Qualifier
- day after emergence (DAE) 40e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Sulfur uptake increased in onion at day after emergence (DAE) 40, independent of its rate with respect to SN control, resulting in increased N by 50%, and consequently higher yield”
Claim · model-written summary
Onion N increased by 50% with increased sulfur uptake at day after emergence 40.
- Taxon
- onionAllium cepae1
- Outcome
- Ne1
- Direction
- increasede1
- Value
- 50%e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Sulfur uptake increased in onion at day after emergence (DAE) 40, independent of its rate with respect to SN control, resulting in increased N by 50%, and consequently higher yield”
Claim · model-written summary
Onion yield was higher in association with sulfur uptake relative to the SN control.
- Taxon
- onionAllium cepae1
- Outcome
- yielde1
- Direction
- highere1
- Comparator
- SN controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Sulfur uptake increased in onion at day after emergence (DAE) 40, independent of its rate with respect to SN control, resulting in increased N by 50%, and consequently higher yield”
Claim · model-written summary
The maximum absolute S uptake rate increased progressively with N rate, but only in the absence of S application.
- Taxon
- onionAllium cepae0
- Treatment
- N ratee3
- Outcome
- maximum absolute S uptake rate (SCm)e3
- Direction
- increasede3
- Qualifier
- but only in the absence of S applicatione3
- Comparator
- absence of S applicatione3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The in-season trend of onion biomass”
e3“The maximum absolute S uptake rate (SCm), a factor defining yield, increased progressively with the N rate, but only in the absence of S application”
Claim · model-written summary
An N rate of 120 kg ha−1 reduced the maximum absolute S uptake rate in onion.
- Taxon
- onionAllium cepae0
- Treatment
- N rate of 120 kg ha−1e4
- Outcome
- SCme4
- Direction
- reductione4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The in-season trend of onion biomass”
e4“The N rate of 120 kg ha−1 resulted in SCm reduction, leading to a yield drop”
Claim · model-written summary
An N rate of 120 kg ha−1 led to a yield drop in onion.
- Taxon
- onionAllium cepae0
- Treatment
- N rate of 120 kg ha−1e4
- Outcome
- yielde4
- Direction
- drope4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The in-season trend of onion biomass”
e4“The N rate of 120 kg ha−1 resulted in SCm reduction, leading to a yield drop”
Claim · model-written summary
Onion plants fertilized simultaneously with S and N showed a more complicated impact on the maximum absolute S uptake rate.
- Taxon
- onionAllium cepae0
- Treatment
- fertilized simultaneously with S and Ne5
- Outcome
- SCme5
- Qualifier
- more complicated impacte5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The in-season trend of onion biomass”
e5“Plants fertilized simultaneously with S and N showed a more complicated impact on SCm”
Claim · model-written summary
The expolinear model indicated an onion growth disturbance, leading to yield depression under unfavorable growth conditions (authors interpretation).
- Taxon
- onionAllium cepae6
- Outcome
- yield depressione6
- Qualifier
- growth disturbance, revealed under unfavorable growth conditionse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“The expolinear model indicated an onion growth disturbance, revealed under unfavorable growth conditions, leading to yield depression”
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See all 184 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.