Claim · model-written summary
Differences in growth rates and nutrient availability were associated with between-quadrat variation.
- Taxon
- rice
Oryza sativat0 - Outcome
- Variation between quadratse0
- Qualifier
- spatial distribution of inherent soil nutrient availability and fertilizer nutrient supplye0
- Setting
- within a fielde0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorDirectionValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Variation between quadrats within a field was due to varying growth rates between tillering and panicle initiation (PI) and was related to the spatial distribution of inherent soil nutrient availability and fertilizer nutrient supply”
t0“Rice”
Title
Spatial and Temporal Variability of Transplanted Rice at the Field Scale
Achim Dobermann; Mirasol F. Pampolino; Heinz‐Ulrich Neue Agronomy Journal 1995. doi:10.2134/agronj1995.00021962008700040018x
Other claims from this paper (13)
- Observation Rice plant height had low spatial variation at all growth stages.
- Observation Tiller number showed greater variation, particularly at tillering.
- Observation Most crop variables had intermediate variation at harvest.
- Observation Unfertilized rice grain yield ranged from 2.41 to 5.88 t ha −1.
- Observation Fertilized rice grain yield ranged from 4.54 to 8.82 t ha −1.
- Observation Transplanting errors introduced among-hill variation.
- Intervention effect Uneven topdressed nitrogen produced local variation in crop stands.
- Method / resource Two samples of three hills sufficed for rice plant-height measurement at every growth stage.
- Method / resource Increasing sample count improved tiller estimates more than enlarging the sampling unit.
- Recommendation Rice tiller sampling between tillering and panicle initiation should use five-hill units from 12 to 19 quadrats.
- Recommendation Seven samples suffice for flowering-stage measurement.
- Recommendation Harvest estimates should use 8 to 12 quadrats with 10-hill units.
- Recommendation Use stratified random sampling with samples more than 3 m apart.