Open AccessLower formulation pH does not enhance bentazone uptake into plant foliage
Author(s) -
Z.Q. Liu
Publication year - 2002
Publication title -
proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference
Language(s) - English
Resource type - Journals
eISSN - 0370-2804
pISSN - 0370-0968
DOI - 10.30843/nzpp.2002.55.3887
Subject(s) - vicia faba , sinapis , biology , lipophilicity , pulmonary surfactant , solubility , brassica , vicia , diffusion , agronomy , plant cell , phytotoxicity , botany , chemistry , biochemistry , physics , organic chemistry , thermodynamics , gene
Lower pH generally favours the diffusion of weak acid compounds in vitro into plant cells Such a rule may not be applicable to the uptake of formulated weak acid herbicides applied to plant foliage in vivo In this study the effect of spray formulation pH (5 7 and 9) on the foliar uptake of a weak acid herbicide bentazone which is used as a formulated salt was investigated using three plant species mustard (Sinapis alba) wheat (Triticum aestivum) and bean (Vicia faba) Greater uptake of the herbicide occurred at pH 9 and pH 7 than at pH 5 on mustard and wheat leaves Uptake of bentazone into bean was slow (< 20 after 24 h) regardless of carrier pH However in the presence of a surfactant faster uptake was achieved with higher pH The results are discussed in relation to the lipophilicity and the solubility of weak acid chemicals as influenced by pH