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Multi‐variable Equations Describing Fertility‐Corn Yield Response Surfaces and Their Agronomic and Economic Interpretation 1
Author(s) -
Baird Bruce L.,
Mason D. D.
Publication year - 1959
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1959.00021962005100030009x
Subject(s) - yield (engineering) , soil water , interpretation (philosophy) , fertility , agronomy , mathematics , polynomial , soil fertility , variable (mathematics) , nitrogen , environmental science , soil science , biology , physics , mathematical analysis , computer science , sociology , thermodynamics , population , demography , programming language , quantum mechanics
Synopsis Representative polynomial equations and contour lines describing yield response surfaces obtained in corn fertility studies are presented for Norfolk and Portsmouth soils. Methods of interpretation are discussed. Increases in yield were attributed to nitrogen at each of the 23 locations on the former and at 10 of the 17 on the latter soils. P or K increased yields at seven locations on the Portsmouth soils but at none on Norfolk soil.