Masters Theses

Boyd E. Brown

Date of Award

8-1968

Degree Type

Thesis

Degree Name

Master of Science

Major

Agronomy

Major Professor

Henry Andrews

Committee Members

L.N. Skold, Homer Swingle

Abstract

A study was made to (1) determine whether soybeans (Glycine max. (L) Merrill) could be grown successfully on chemically killed sod, (2) to evaluate a new experimental herbicide for use in growing corn (Zea mays L.) on sod, (3) to test different rates and combinations of recommended herbicides, and (4) to determine the effect of herbicide residues on the germination and growth of six fall seeded crops following sod planted corn.

It was found that v/eed control was fair to excellent in all treatments in both corn and soybeans.

In the soybean experiments, sod control was insufficient for good soybean growth in any of the treatments except the conventionally prepared seedbed at Knoxville. Yield data were not obtained in the soybean experiments.

Sod control in the corn experiments was good enough for high yields. At Springfield, the only location where yield data were taken, the best sod control and highest yields were obtained from the treatment using two pounds 2-chloro-4-ethylamino-6-isopropyl-amino-s-triazine (atrazine) plus one-quarter pound of 1, 1'-dimethyl-4,4'-bipyridinium salt (paraquat). The poorest sod control was in the treatment with two pounds of atrazine plus four pounds of cis-2,3,5,5,5-pentachloro-4- ketopentenoic acid (AP20). This treatment also resulted in the lowest corn yields.

Rye (Secale cereale L.) at Springfield was the only fall seeded crop that became established. There was no apparent herbicide injury to the rye as a result of herbicide residues.

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