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ARS Home » Southeast Area » Tifton, Georgia » Crop Protection and Management Research » Research » Publications at this Location » Publication #200617
Title: Residual herbicide dissipation for bare soil versus soil under low density polyethylene mulch

Author
item GREY, T - UNIV. OF GA, TIFTON,GA
item CULPEPPER, A - UNIV. OF GA, TIFTON,GA
item Webster, Theodore

Submitted to: International Conference on Methyl Bromide Alternatives and Emissions Reductions
Publication Type: Abstract Only
Publication Acceptance Date: 9/17/2006
Publication Date: 11/6/2006
Citation: Grey, T.L., Culpepper, A.S., Webster, T.M. 2006. Residual herbicide dissipation for bare soil versus soil under low density polyethylene mulch [abstract]. In: Proceedings of the Annual International Conference on Methyl Bromide Alternatives and Emissions Reductions, November 6-9, 2006, Orlando, FL. p. 127.1-127.2.

Interpretive Summary:

Technical Abstract: Yellow nutsedge and purple nutsedge are the most common and troublesome vegetable weeds in the Southern US. Herbicides in low density polyethylene (LDPE) mulch systems are potential methyl bromide alternatives for nutsedge control. Halosulfuron-methyl, sulfentrazone, and s-metolachlor all have nutsedge activity. However, dissipation of these compounds under LDPE mulch has not been characterized. Halosulfuron and s-metolachlor dissipation was more rapid in bare-soil than under LDPE mulch. Sulfentrazone dissipation for bare soil was equal to soil under LDPE mulch in 2003. However, sulfentrazone dissipation in 2004 was more rapid in soil under LDPE mulch than in bare-soil. The time required for 50% dissipation (DT50) in bare-soil for s-metolachlor, halosulfuron, and sulfentrazone was 2, 7, and 16 days, respectively. Under LDPE mulch, DT50 for S-metolachlor, halosulfuron, and sulfentrazone was 4, 10, and 13 days, respectively. Correlation between herbicide dissipation and bioassay in 2004 indicated that assay species root dry weights were negatively correlated to herbicide concentration. Data indicated that s-metolachlor and sulfentrazone bioassays, using oat and cotton respectively, could be utilized to assess the level of herbicide dissipation. Sulfentrazone dissipation was slower than halosulfuron or s-metolachlor. This indicates that sulfentrazone could provide nutsedge control when PRE applied to vegetables, but could also have the propensity for residual activity to rotational crops.