Plant Physiol. Illumina
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Plant Physiology 79:1077-1079 (1985)
© 1985 American Society of Plant Biologists

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Articles

Effect of Foliar Applications of Urea on Accelerated Senescence of Maize Induced by Ear Removal 1

Frederick E. Below, Steven J. Crafts-Brandner2 and Richard H. Hageman

Department of Agronomy, University of Illinois, Urbana, Illinois 61801

Field grown maize (Zea mays L. cv B73 x Mo17) plants, with and without ears, were sprayed with urea solutions to determine whether foliar application of N could prevent or delay the accelerated loss of reduced N from the leaf and leaf senescence induced by ear removal. Urea sprays were applied at 7, 14, and 21 days after anthesis in three separate and equal applications that provided a total of 67 kilograms N per hectare or 1 gram N per plant. Treatments were arranged in a 2 x 2 factorial in a randomized complete block with five replicates. Appropriate plant and leaf samplings and assays were made.

In response to spray treatments, net increases of reduced N were detected in the whole shoot and plant parts, especially the stalk of the earless plants and grain of the eared plants. There was no effect of urea spray treatment on the normal loss of N from the leaves or rate of senescence of the eared plants or on the accelerated loss of N from the leaves or rate of senescence induced by ear removal. Grain and stover yields were unaffected by the spray treatment.

Apparently the plants were unable to utilize the urea N applied to the vegetation (primarily leaves) after anthesis to enhance or extend the accumulation of dry weight by either eared or earless plants.

2 Present address: United States Department of Agriculture, Agricultural Research Service, Agronomy Department, University of Kentucky, Lexington, KY 40546.

1 Supported by the Illinois Agriculture Experimental Station Project 371, Hatch Funds, and a gift from Pioneer Hi-Bred International, Inc.






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1985 by the American Society of Plant Biologists