Date of Award:

5-1952

Document Type:

Thesis

Degree Name:

Master of Science (MS)

Department:

Plants, Soils, and Climate

Department name when degree awarded

Agronomy

Committee Chair(s)

D. C. Tingey

Committee

D. C. Tingey

Abstract

Pheasant eye (Adonis annua L.), a native of Europe, is commonly cultivated as an ornamental, but occasionally escapes into fields and waste places. It is prevalent in certain areas in the United States, especially southward, on heavy soils that are inadequately drained (20). This plant is one of a number of early maturing winter annual weeds that infests dryland wheat in northern Utah, and it has become a problem in certain lowland areas.

This weed cannot be controlled by usual cultural practices because it makes most of its growth during the time of the year when the soil is too wet to be tilled. It appears likely, therefore, that the use of herbicides may offer the most effective means of controlling pheasant eye and other weeds of similar growth habit.

This investigation was conducted to determine the most effective method of controlling pheasant eye, and the effects of such control on the yield of wheat and other related factors as affected by the elimination of the weed by 2,4-D, the addition of nitrogen fertilizer, and a combination of these two factors. Introduction of nitrogen fertilizer into the experiment permitted a study of the effect of 2,4-D on the yield of wheat in two environments. An attempt was made to determine if this weed actually produced sufficient competition with the wheat to reduce yields.

The tests reported herein were conducted on Trenton clay soil in the Benson area in Cache County, Utah during the 1950-51 growing season.

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