Effect of Foliar Applications of Urea on the Physiology and Productivity of Maize

Maize hybrids were sprayed at various stages of development with a mixture of urea and minerals (NPKS) or urea solutions in 1981 and 1982 to determine the effect of foliar fertilization on the physiology and productivity of maize. In 1981, five maize hybrids (P3382, B73xMo17, B84xMo17, B73xB77, FS854) were sprayed with an NPKS solution at 7 days before or 12 days after anthesis to provide a total of 11.7, 3.7, 3.7, 0.5 kg ha('-1) of N, P, K and S, respectively. In 1982, three maize hybrids (P3382, B73xMo17, FS854) were sprayed with urea solutions (two separate but equal applications) at 12 and 6 days before anthesis, 9 and 15 days after anthesis, and 25 and 32 days after anthesis to provide a total of 67 kg N ha('-1). At weekly intervals plants were harvested and subdivided into leaves, stalks (including sheaths), cobs and kernels, and assayed for dry weight, reduced-N, nitrate, and total nonstructural carbohydrates. Grain yields were determined from selected plants and from a center row reserved for final yield determinations.

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

• Below, Frederick Earl, Jr.

• Biology, Plant Physiology

Identifier

(UMI)AAI8409860

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/71590