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Heat Units as a Method of Measuring Maturity in Corn 1
Author(s) -
Gilmore E. C.,
Rogers J. S.
Publication year - 1958
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/agronj1958.00021962005000100014x
Subject(s) - sowing , hybrid , maturity (psychological) , agronomy , mathematics , growing degree day , degree (music) , biology , zoology , physics , psychology , developmental psychology , acoustics
Synopsis Ten hybrids and 10 inbreds were planted on 5 different dates in 1956 and their maturities, based on silking dates, were calculated in heat units by 15 different methods. The present method of calculating degree days, daily mean minus 50° F., was improved by correcting for temperatures below the minimum for growth, 50° F., and above the optimum for growth, 86° F. The number of heat units required for silking, designated as effective degrees, remained relatively constant for crops with different planting dates, while calendar days varied widely.