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Thesis (M.S.)--University of Nebraska--Lincoln, 1954. Department of Agronomy.


Copyright 1954, the author. Used by permission.


Case histories of livestock losses in Nebraska and other states have suggested that 2,4-D may affect ordinary harmless plants in such a way as to make them toxic to livestock. The frequency of livestock losses reportedly due to “chemical” poisoning as a result of weeds in pastures sprayed with 2,4-D, despite the known fact that 2,4-D itself is non-poisonous, is somewhat contradictory. This investigation was initiated to determine the effect of foliage applications of 2,4-D on the nitrate content of the plants.

An investigation of the influence of 2,4-dichlorophenoxyacetic acid and nitrogen fertilizer applications (in the form of ammonium nitrate) on the total nitrogen content and the nitrate fraction of pigweed (Amaranthus sp.), wild mustard (Brassica arvensis Ktze), velvetleaf (Abutilon theophrasti Medic.), crabgrass (Digitaria sp.) and sudan grass (Sorghum vulgare) was conducted in 1951. Nitrogen was applied at rates of 0, 60 and 120 pounds per acre. 2,4-D was applied to the plants at an early stage of growth at 0, 1/8, 1/4, and 1/2 pound per acre. All treatments were replicated four times.

Advisor: F. D. Keim.