Claim · model-written summary
A quadratic model explained lettuce yield response to N fertilizer rate regardless of cultivar and N source.
- Taxon
- lettuce
Lactuca sativat0 - Treatment
- N fertilizer ratee1
- Outcome
- yield response to N fertilizer ratee1
- Qualifier
- regardless of cultivar and N sourcee1
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingDirectionValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“lettuce yield”
e1“Quadratic model explained lettuce yield response to N fertilizer rate, regardless of cultivar and N source”
Title
Influence of nitrogen source and rate on lettuce yield and quality
Omid R. Zandvakili; Allen V. Barker; Masoud Hashemi; et al. Agronomy Journal 2021. doi:10.1002/agj2.20966
Other claims from this paper (13)
- Intervention effect DCM gave a lower fresh lettuce yield (24.0 Mg ha –1) than URE (30.1 Mg ha –1).
- Intervention effect DCM gave a lower fresh lettuce yield (24.0 Mg ha –1) than DSM (30.7 Mg ha –1).
- Intervention effect DCM gave a lower fresh lettuce yield (24.0 Mg ha –1) than BLM (28.7 Mg ha –1).
- Intervention effect DCM gave the least total N, nitrate-N and ammonium-N of all N sources.
- Observation Lettuce N requirement at maximum yield was 157.7 kg ha–1 for BLM.
- Observation Lettuce N requirement at maximum yield was 171.4 kg ha–1 for DSM.
- Observation Lettuce N requirement at maximum yield was 112.5 kg ha–1 for DCM.
- Observation Lettuce N requirement at maximum yield was 191.7 kg ha–1 for URE.
- Intervention effect An increase in N application rate increased total N, nitrate-N and ammonium-N in lettuce.
- Intervention effect An increase in N application rate decreased agronomic efficiency and apparent N recovery in lettuce.
- Observation Incidence of lettuce tipburn and head decay was specific to cultivar.
- Intervention effect N source did not influence incidence of lettuce tipburn and head decay.
- Recommendation The authors conclude that DSM could be used as an organic fertilizer source for lettuce that provides N similar to URE.