Claim · model-written summary
Reducing the spray volume below 10 ml. per square yard produced a progressive decrease in the magnitude of response on kidney-bean plants.
- Taxon
- kidney-bean
Phaseolus vulgarise1 - Treatment
- reduced below 10 ml. per square yarde2
- Outcome
- magnitude of responsee2
- Direction
- progressive decreasee2
Not reportedComparator
Verbatim
e1“Aqueous sprays, containing a constant threshold amount of the ammonium salt of 2,4-dichlorophenoxyacetic acid, were found to be most effective at a volume rate of 10-20 ml. per square yard when applied to young kidney-bean plants”
e2“Rates of 40-100 ml. per square yard were less effective, and there was a progressive decrease in magnitude of response as the volume was reduced below 10 ml. per square yard”
Title
Harold H. Smith Botanical Gazette 1946. doi:10.1086/335380
Other claims from this paper (10)
- Intervention effect Aqueous 2,4-D ammonium salt sprays were most effective at a volume rate of 10-20 ml. per square yard on young kidney-bean plants.
- Intervention effect Rates of 40-100 ml. per square yard were less effective than a volume rate of 10-20 ml. per square yard on kidney-bean plants.
- Intervention effect As the spray volume was reduced, a progressively larger amount of growth-inhibiting substance was required to kill young soybean plants.
- Observation Twenty mg. of compound per square yard was needed at the 8-ml. per square yard volume rate on soybean plants.
- Observation At least 60 mg. per square yard of compound was needed at the 2-ml. per square yard rate on soybean plants.
- Intervention effect Sprays of large droplet size were more effective than sprays of small droplet size on kidney-bean plants.
- Intervention effect Sprays of larger droplet size led to more solution being deposited and retained on kidney-bean plants.
- Intervention effect A higher percentage of the spray was intercepted and retained at volume rates of 10-20 ml. per square yard than at smaller or larger volumes.
- Recommendation Growth-regulating compounds should be applied in sprays devoid of finely atomized particles and in volumes of 10-20 ml. per square yard rather than at saturation levels.
- Observation Growth inhibitors can be effective when applied in very low spray volumes.