Genetic and Environmental Responses of Harvest Index and Other Agronomic Traits in Winter Wheat (Triticum Aestivum L.) and Spring Oats (Avena Sativa L.)

Two experiments conducted with winter wheat and spring oats investigated the potential of several agronomic traits, especially harvest index, total dry matter production, and growth rate, for improving grain yield. The effect of four nitrogen fertilizer treatments on harvest index, grain yield, grain protein percentage, grain protein yield, and total dry matter yield of wheat was evaluated for nine soft and three hard red winter wheat cultivars in 1979 and 1980. Nitrogen harvest index, straw protein percentage, and the total, reduced, and nitrate nitrogen concentrations of the foliage at anthesis were also examined. Application of supplemental nitrogen increased grain, grain protein, and dry matter yields in 1980 but had no positive effect in 1979 due to a severe drought condition. Nitrogen harvest index and harvest index were not increased in either year by supplemental nitrogen while increases for straw and grain protein percentage, and for the three anthesis nitrogen concentrations were found in both years. Responses of individual cultivars to individual nitrogen treatments were inconsistent due to a sharp year x nitrogen treatment interaction.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Agronomy

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2014

Author dc:creator

• Howey, Arden Eugene

• Agriculture, Agronomy

Identifier

(UMI)AAI8218487

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/71574