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ARS Home » Midwest Area » West Lafayette, Indiana » National Soil Erosion Research Laboratory » Research » Publications at this Location » Publication #85785
Title: SOIL AMENDMENT-HERBICIDE INTERACTIONS

Author
item Hickman, Michael
item HE, BINGHUI - CHONGQING, CHINA
item SELLERS, BRENT - PURDUE UNIV., W.LAF., IN

Submitted to: North Central Weed Science Society US Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 1/15/1998
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Several amendments have been tested to stabilize the soil surface against water erosion. There include gypsum (Calcium Sulfate) and PAM (polyacrylamide), among others. Studies were undertaken to examine the impact of soil amendments on the runoff and leaching of selected soil applied herbicides. Laboratory trials using rainfall simulation and a uniformly packed sandy clay loam soil were conducted at the National Soil Erosion Research Laboratory, West Lafayette, IN, in 1996. The packed soil boxes were treated with amendments including gypsum, PAM, gypsum plus PAM, ammonium laureth sulfate and ammonium lauryl sulfate. These amendments were applied to the soil surface followed by the spray application of herbicides atrazine and metolachlor. The treated soils were allowed to stand for one hour and then were placed at a 5 percent slope and subject to 120 minutes of rainfall at a rate of 60 mm per hour. Periodic runoff water and sediment samples were collected for analysis. The soils stood for 24 hours and were subjected to rainfall at 30 mm per hour for an additional 60 minutes. Soil core samples were collected and stratified to 2 cm layers for analysis of herbicide leaching. Gypsum and PAM were shown to be effective in reducing soil loss and in improving water infiltration. Mixing gypsum and PAM did not result in substantial improvement over the additives alone. Ammonium laureth sulfate and ammonium lauryl sulfate were not effective in improving infiltration or reducing soil loss in these trials. None of the amendment treatment resulted in significantly increased herbicide leaching.