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Effects of Sewage Sludge on Phenoxy Herbicide Adsorption and Degradation in Soils¹

ABSTRACT

The adsorption and degradation of two herbicides, 2,4,dichlorophenoxyacetic acid (2,4-D) and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T), were examined in three soils either freshly amended or preconditioned for 2 months with sewage sludge. Sludge additions generally enhanced herbicide degradation, but had no effect on 2,4-D degradation in a soil with a history of 2,4-D applications. Fresh sludge additions had little effect on herbicide adsorption by soils, while preconditioning the sludge-soil mixtures generally increased herbicide adsorption.

Key Words: 2,4-D • 2,4,5-T • pesticide persistence

¹ Journal Article no. 828, New Mexico Agric. Exp. Stn., Las Cruces, NM 88003. Funds to support this research provided in part by Regional Res. Proj. W-82.

² Associate Professor and Research Specialists, respectively, Dep. of Agronomy, New Mexico State University, Las Cruces.