HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Baird, B. L. Articles by Mason, D. D. Search for Related Content PubMed Articles by Baird, B. L. Articles by Mason, D. D. Agricola Articles by Baird, B. L. Articles by Mason, D. D.

The Relationship of Nitrogen in Corn Leaves to Yield¹

ABSTRACT

The propriety of specifying rates of N fertilization by the use of the N content of the leaves of corn was evaluated.

Steep slopes of both curves relating yield and N content of corn leaves to rates of N fertilization were associated with high correlation coefficients for the former two variables. These correlation coefficients consistently decreased, often becoming negative, as the rates of N fertilization were increased.

An evaluation also was made of the percent N of corn leaves corresponding to the economic optimum yields and maximum yields of grain for the fertility experiments at 38 locations.

Even though there may be good correlation between yield and N in the leaves, N content of leaves was a poor indicator of the rate of N fertilization. This was true for both economic optimum and maximum yields. The use of the percent N in the leaf should therefore be limited to the comparison of the effect of known factor variation under research conditions and not for the prediction of rates of fertilizer application.

¹ Joint contribution from Departments of Soils and of Statistics, North Carolina Agr. Exp. Sta., Raleigh, in cooperation with the Division of Agriculture Relations, Tennessee Valley Authority. Approved as Paper No. 1245 of the Journal Series of the North Carolina Agr. Exp. Sta. Presented before Div. IV, Soil Science Society of America, at Cincinnati, Ohio, Nov. 18, 1959.

² Statistician, Thiokol Chemical Corporation, formerly Research Instructor of Soils, North Carolina State College; Professor of Soils, and Professor of Experimental Statistics, North Carolina State College, respectively.

Received for publication July 17, 1961. Accepted for publication January 26, 1962.