Abstract
Abstract In a study to evaluate the deposit distribution from aerial sprays on cotton in the Sudan Gezira, a combination of subjective visual assessment and quantitative chemical analysis was used. Spray deposits on leaf discs, made visible in ultraviolet light by the addition of a fluorescent pigment, were subjectively grouped into classes according to a series of standards. The mean chemical deposit on the discs in each class was measured by the gas‐liquid chromatographic determination of the profenofos content. The 810 leaves needed to define the deposit distribution with good confidence could be examined economically within the required period by this combination of quick subjective assessment and subsequent quantitative chemical calibration. Results showed that the vertical profile of the deposit distribution within the canopy followed the classical exponential decay curve. The rate of decrease depended mainly on the foliage density. The foliage effectively dampened the wind turbulence so much that the penetration of visible droplets within the lower two‐thirds of the canopy was predominantly by gravity. Suggestions for the use of the deposit distribution probability to predict the likely biological effectiveness in the field are discussed.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 4
Claim · model-written summary
In cotton, the vertical profile of spray deposit distribution within the canopy followed an exponential decay curve.
- Taxon
- cotton
Gossypium hirsutumt0 - Outcome
- vertical profile of the deposit distribution within the canopye0
- Qualifier
- classical exponential decay curvee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“spray deposits within a cotton canopy”
e0“Results showed that the vertical profile of the deposit distribution within the canopy followed the classical exponential decay curve”
Claim · model-written summary
In cotton, the rate of decrease of spray deposits within the canopy depended mainly on foliage density.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- rate of decreasee1
- Qualifier
- foliage densitye1
- Setting
- cotton canopyt0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“spray deposits within a cotton canopy”
e1“The rate of decrease depended mainly on the foliage density”
Claim · model-written summary
Foliage dampened wind turbulence so that visible droplets penetrated the cotton canopy mainly by gravity.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- penetration of visible dropletse2
- Qualifier
- dampened the wind turbulencee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“spray deposits within a cotton canopy”
e2“The foliage effectively dampened the wind turbulence so much that the penetration of visible droplets”
e3“was predominantly by gravity”
Claim · model-written summary
Combining quick visual classing with chemical calibration let 810 leaves be examined economically within the required period.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- could be examined economicallye4
- Value
- 810 leavese4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“spray deposits within a cotton canopy”
e4“The 810 leaves needed to define the deposit distribution with good confidence could be examined economically within the required period”