Abstract
The large variation in the response of sunflower to nitrogen fertilization indicates the need for studies to better adjust the optimum levels of this nutrient for production conditions. Our objectives were to analyze the agronomic yield of sunflower cultivars as a function of nitrogen fertilization; indicate the cultivar with high nitrogen use efficiency; and measure the adequate N dose for sunflower through nutritional efficiency. The completely randomized block design with split plots was used to conduct the experiments. The treatments included five nitrogen rates being allocated in the plots and the four sunflower cultivars. To estimate the nutrient use efficiency in the sunflower, we measured agronomic efficiency (AE), physiological efficiency (PE), agrophysiological efficiency (APE), apparent recovery efficiency (ARE), and utilization efficiency (UE). The results indicate that all cultivars had a reduction in AE due to the increase in N doses in the first crop. For PE, the highest values were observed for Altis 99 during the 2016 harvest. In that same harvest, Altis 99 had the highest APE. The dose of 30 kg ha−1 provided greater ARE for all cultivars in both crops, with greater emphasis on BRS 122 and Altis 99. The cultivation of cultivars Altis 99 and Multissol at a dose of 30 kg ha−1 in is recommended semiarid regions.
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Claims 6
Claim · model-written summary
All sunflower cultivars had reduced agronomic efficiency with increasing N dose in the first crop.
- Taxon
- sunflower
Helianthus annuuse0 - Treatment
- increase in N dosese1
- Outcome
- AEe1
- Direction
- reductione1
- Qualifier
- in the first crope1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“response of sunflower to nitrogen fertilization”
e1“all cultivars had a reduction in AE due to the increase in N doses in the first crop”
Claim · model-written summary
Altis 99 had the highest physiological efficiency (PE) during the 2016 harvest.
- Taxon
- sunflowerHelianthus annuuse0
- Material
- Altis 99e2
- Outcome
- PEe2
- Direction
- highest valuese2
- Setting
- 2016 harveste2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“response of sunflower to nitrogen fertilization”
e2“For PE, the highest values were observed for Altis 99 during the 2016 harvest”
Claim · model-written summary
Altis 99 had the highest agrophysiological efficiency (APE) in the same 2016 harvest.
- Taxon
- sunflowerHelianthus annuuse0
- Material
- Altis 99e3
- Outcome
- APEe3
- Direction
- higheste3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“response of sunflower to nitrogen fertilization”
e3“In that same harvest, Altis 99 had the highest APE”
Claim · model-written summary
A dose of 30 kg ha−1 gave greater apparent recovery efficiency (ARE) for all cultivars in both crops.
- Taxon
- sunflowerHelianthus annuuse0
- Treatment
- 30 kg ha−1e4
- Outcome
- AREe4
- Direction
- greatere4
- Qualifier
- in both cropse4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“response of sunflower to nitrogen fertilization”
e4“The dose of 30 kg ha−1 provided greater ARE for all cultivars in both crops, with greater emphasis on BRS 122 and Altis 99”
Claim · model-written summary
BRS 122 and Altis 99 showed greater emphasis on ARE at 30 kg ha−1.
- Taxon
- sunflowerHelianthus annuuse0
- Material
- BRS 122 and Altis 99e4
- Outcome
- AREe4
- Direction
- greater emphasise4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“response of sunflower to nitrogen fertilization”
e4“The dose of 30 kg ha−1 provided greater ARE for all cultivars in both crops, with greater emphasis on BRS 122 and Altis 99”
Claim · model-written summary
Altis 99 and Multissol at 30 kg ha−1 are recommended for semiarid regions.
- Taxon
- sunflowerHelianthus annuuse0
- Material
- Altis 99 and Multissole6
- Treatment
- a dose of 30 kg ha−1e6
- Outcome
- cultivation of cultivars Altis 99 and Multissole6
- Setting
- semiarid regionse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“response of sunflower to nitrogen fertilization”
e6“The cultivation of cultivars Altis 99 and Multissol at a dose of 30 kg ha−1 in is recommended semiarid regions”
The same questions in other papers
nitrogen · nutrient: efficiency · Helianthus annuus (common sunflower)Positive and negative results
1 paper in the same direction as this paper · 7 in the opposite direction
- positive
- positive
- positive
5 papers more in this group
See all 9 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.