Premium
Physico‐chemical studies on agricultural sprays. IV. —The retention of spray liquids on leaf surfaces
Author(s) -
Furmidge C. G. L.
Publication year - 1962
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740130213
Subject(s) - wetting , retention time , water retention , surface tension , chemistry , materials science , spray drying , chromatography , composite material , thermodynamics , environmental science , soil science , soil water , physics
Abstract The retention of spray liquids has been measured on the surface of leaves of various plants. Various spray liquids, having a range of wetting abilities, were used and the retention was measured both by spraying the surface up to the point of spray run‐off, thus giving a measure of the maximum retention, and by spraying the surface to beyond run‐off conditions. For any given surface, the maximum retention was related to the theoretical retention factor, which was calculated from the values of the dynamic advancing and receding contact angles of the spray liquid on the solid surface and from the surface tension of the spray liquid. After spraying beyond run‐off, the theoretical retention factor will predict the relative levels of retention with reasonable accuracy. This agreement between measured and theoretical retention has enabled the retention theory to be used to study the importance of many of the variables that govern spray retention in practice. These variables are discussed.