Premium
Bromacil in Lakeland Soil Ground Water
Author(s) -
Hebb Edwin A.,
Wheeler Willis B.
Publication year - 1978
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1978.00472425000700040026x
Subject(s) - environmental science , groundwater , leaching (pedology) , environmental chemistry , organic matter , water table , residue (chemistry) , surface water , hydrology (agriculture) , soil water , chemistry , agronomy , soil science , environmental engineering , geology , biology , biochemistry , geotechnical engineering , organic chemistry
The objective of this study was to evaluate the probable magnitude of the problem of the leaching of pesticides into ground water under extreme conditions: a sandy soil low in organic matter, a persistent and mobile herbicide applied at a high rate, plentiful rainfall, and a water table within 6 m. Bromacil (5‐bromo‐3‐ sec ‐butyl‐6‐methyluracil) was applied at the rate of 22 kg/ha to a Lakeland sand bearing scrub vegetation of small oaks and poor grasses. Ground water (at depths ranging from 4.5 to 6 m) was sampled from bromacil residue at weekly intervals for 2 years. Residue was first found in the ground water 3 mo after application and was highest (1.25 ppm) 1 month later. Thereafter the amount declined to <0.1 ppm in about a year and <0.001 ppm in 2 years. Peaks in residues generally followed periods of increased rainfall by about 2 weeks. Residues (0.24 ppm) were still detected in the surface soil 2 years after application.