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Pig Slurry Amendment and Herbicide Coapplication Effects on s‐Triazine Mobility in Soil: An Adsorption‐Desorption Study
Author(s) -
Businelli Daniela
Publication year - 1997
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/jeq1997.00472425002600010016x
Subject(s) - atrazine , terbuthylazine , chemistry , desorption , sorption , loam , environmental chemistry , slurry , adsorption , amendment , pesticide , environmental science , agronomy , environmental engineering , soil water , soil science , organic chemistry , political science , law , biology
Amendments with pig slurry containing dissolved organic matter (PSDOM) and herbicide coapplication are agronomical practices that can influence the mobility of herbicides through the soil profile, thus enhancing the risk of groundwater pollution. Batch equilibrium experiments were conducted on a clay loam soil to quantify the influence of these practices on the sorption and desorption of three s‐triazine herbicides: atrazine (2‐chloro‐4‐ethylamino‐6‐isopropylamino‐l,3,5‐triazine), prometryn (2,4‐bis (isopropylamino)‐6‐methylthio‐1,3,5‐triazine), and terbuthylazine (2‐tert‐butylamino‐4‐chloro‐6‐ethylamino‐ 1,3,5‐triazine). Soil adsorption and desorption capability for atrazine was reduced when it was applied with the other two s‐triazines in the batch experiment solution. The PSDOM treatment immediately after atrazine application had a greater enhancing effect on its desorption than treatment with a 0.01 M CaCl 2 solution alone. No enhanced desorption effect was observed on any of the three s‐triazines when PSDOM treatment was carried out after repeated 0.01 M CaCl 2 treatments. Soil treatment with PSDOM before atrazine application enhanced soil adsorption capability for the herbicide. On calculating the balance between the adsorbed and desorbed atrazine in the PSDOMtreated soil, a fourfold increase of the atrazine retained was observed. Therefore, to reduce the risk of groundwater s‐triazine pollution, pig slurry should be applied to the soil before herbicide treatment.