Effect of organic fertilizers derived dissolved organic matter on pesticide sorption and leaching.
Incorporation of organic fertilizers/amendments has been, and continues to be, a popular strategy for golf course turfgrass management. Dissolved organic matter (DOM) derived from these organic materials may, however, facilitate organic chemical movement through soils. A batch equilibrium technique was used to evaluate the effects of organic fertilizer-derived DOM on sorption of three organic chemicals (2,4-D, naphthalene and chlorpyrifos) in USGA (United States Golf Association) sand, a mixed soil (70% USGA sand and 30% native soil) and a silt loam soil (Typic Fragiochrept). DOM was extracted from two commercial organic fertilizers. Column leaching experiments were also performed using USGA sand. Sorption experiments showed that sorption capacity was significantly reduced with increasing DOM concentration in solution for all three chemicals. Column experimental results were consistent with batch equilibrium data. These results suggest that organic fertilizer-derived DOM might lead to enhanced transport of applied chemicals in turf soils.
Li
Kun
K
Department of Plant, Soil, and Insect Sciences, Stockbridge Hall, University of Massachusetts, Amherst, MA 01003, USA.
Xing
Baoshan
B
Torello
William A
WA
D015084:2,4-Dichlorophenoxyacetic Acid / Q000737:chemistry; D004390:Chlorpyrifos / Q000737:chemistry; D005308:Fertilizers; D006540:Herbicides / Q000737:chemistry; D007306:Insecticides / Q000737:chemistry; D009281:Naphthalenes / Q000737:chemistry; D010575:Pesticides / Q000737:chemistry*; D006109:Poaceae; D012987:Soil; D012995:Solubility; D013500:Surface Tension
D005308:Fertilizers; D006540:Herbicides; D007306:Insecticides; D009281:Naphthalenes; D010575:Pesticides; D012987:Soil; C031721:naphthalene; D015084:2,4-Dichlorophenoxyacetic Acid; D004390:Chlorpyrifos