Date of Award:


Document Type:


Degree Name:

Master of Science (MS)


Plants, Soils, and Climate

Department name when degree awarded

Plant Science

Committee Chair(s)

John O. Evans


John O. Evans


R. Lynn


P. Christiansen


Six days following the application of 1.5 and 3.0 lb/A of 2- methoxy-4-sec.-butylamino-6-ethylamino-s-triazine (GS-14254) to established plots of alfalfa, water samples were collected at several distances from the plots and analyzed for herbicide residues with a Beckman DB-G grating spectrophotometer. The data indicate that GS-14254 is transported in small amounts but that the concentrations in the runoff water decline rapidly with increased distance from the treated areas and time.

S-14254 produced no visual injury symptoms of leaf chlorosis or plant stunting on alfalfa at the two rates used. However, some initial injury has been reported by other workers.

This study indicates that oats are very sensitive to GS-14254 and that they would be a good bioassay for detecting different concentrations of this chemical in soil.

The data indicate that the green alga, Chlorella, is a very sensitive test organism. However, all herbicide concentrations and incubation periods examined were found to be algistatic.

Indications are that concentrations of this chemical transported in irrigation or precipitation runoff water when used at recommended rates, would likely not be hazardous to plant and animal life.