Claim · model-written summary
SPAD was poorly related to yield increase from nitrogen topdressing.
- Taxon
- rice
Oryza sativae0 - Treatment
- N topdressing applicatione0
- Outcome
- rice yield increasee0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingDirectionValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the relationship between SPAD value and the rice yield increase from N topdressing application was not very good.”
Title
Effects of preflood nitrogen rate and midseason nitrogen timing on flooded rice
R. CARRERES; J. SENDRA; R. BALLESTEROS; et al. The Journal of Agricultural Science 2000. doi:10.1017/s0021859699007868
Other claims from this paper (10)
- Intervention effect Grain yield increased with preflood nitrogen up to 100 kg N/ha.
- Observation The main yield component response was panicle number per ground area.
- Association Yield components and grain yield depended on timing of extra nitrogen.
- Intervention effect Split nitrogen applications did not improve agronomic efficiency.
- Intervention effect Split nitrogen applications reduced days to maturity and lodging.
- Intervention effect Split nitrogen applications increased harvest index.
- Intervention effect Split nitrogen at 150 kg/ha total with the second dose at panicle initiation increased grain yield.
- Association Nitrogen content and SPAD chlorophyll content were significantly but weakly related.
- Method / resource The SPAD regression equation differed significantly by growth stage.
- Method / resource SPAD may indicate the need for nitrogen topdressing at mid-tillering but not panicle initiation.