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Nitrogen and Phosphorus Composition of Corn Leaves and Corn Yields in Relation to Critical Levels and Nutrient Balance
Author(s) -
Dumenil Lloyd
Publication year - 1961
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/sssaj1961.03615995002500040019x
Subject(s) - nutrient , phosphorus , nitrogen , yield (engineering) , agronomy , fertilizer , composition (language) , zea mays , chemistry , zoology , biology , linguistics , materials science , philosophy , organic chemistry , metallurgy
The relationship between corn yields and the N and P contents of corn leaves was determined in 93 fertilizer experiments by multiple curvilinear regression. The objective was to investigate critical levels and nutrient balance. Equal yields occurred at varying concentrations of N and P in the corn leaf within certain limits. The N or P content in the corn leaf at 95% of maximum yield varied with the concentration of the other nutrient because of their significant interaction on yield. Hence, the critical N or P level is not a point nor narrow range of values but includes a wide range of values depending on how it is defined and on the level of the other nutrient in the leaf. The N‐P nutrient balance appeared to be critical only at or near the maximum yield. Nutrient unbalance may occur when the leaf N or P content extends beyond a certain limit in relation to the other one.