The persistence of spray droplets above two vegetation canopies
作者:
Philip M. Symmons,
Andreas Dubs,
期刊:
Pesticide Science
(WILEY Available online 1984)
卷期:
Volume 15,
issue 1
页码: 18-24
ISSN:0031-613X
年代: 1984
DOI:10.1002/ps.2780150104
出版商: John Wiley&Sons, Ltd
数据来源: WILEY
摘要:
AbstractDroplets were released from an ‘instantaneous line source’ perpendicular to the wind at heights of 4 and 7 m above the ground. Droplets were collected by rotating samplers at three heights; sets of samplers were positioned in a line parallel to the wind, downwind of the line source. Trials were carried out in moderately unstable conditions during the day, and under stable conditions shortly after dark, both over short rough stubble and over mature cotton. A substantial proportion of the small droplets were found to travel as far as 500 m over cotton; over grass, few of even the smallest droplets were collected 250 and 500 m downwind of the line source. Collection at the distant samplers was on average slightly, but not significantly, more when the spray was released at the greater hei
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