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The Relationship of Nitrogen in Corn Leaves to Yield
Author(s) -
Baird Bruce L.,
Fitts J. W.,
Mason D. D.
Publication year - 1962
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1962.03615995002600040020x
Subject(s) - human fertilization , yield (engineering) , nitrogen , nitrogen fertilizer , fertilizer , positive correlation , agronomy , negative correlation , mathematics , grain yield , zoology , chemistry , biology , organic chemistry , medicine , materials science , metallurgy
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.