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Character Associations Among Grain Yield, Biological Yield and Harvest Index
Author(s) -
Hühn M.
Publication year - 1991
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1111/j.1439-037x.1991.tb00920.x
Subject(s) - yield (engineering) , index (typography) , mathematics , grain yield , rapeseed , character (mathematics) , agronomy , correlation , statistics , biology , computer science , geometry , physics , thermodynamics , world wide web
The harvest index Z is defined, for example for cereals, as the ratio between grain yield X and biological yield Y: Z = X/Y. In this paper the character associations among biological yield, grain yield and harvest index have been investigated theoretically by calculating the covariances and correlation coefficients between harvest index and grain yield and, additionally, between harvest index and biological yield. Explicit formulae are derived for these covariances and correlation coefficients and conclusions are derived and discussed. Many facts and relations among these characters which are well‐known and frequently established by many experimental studies with quite different crops can be obtained and characterized by these theoretical investigations as necessary implications of the underlying statistical relationships. Finally, all the theoretical studies and results are demonstrated and applied to a numerical example of winter‐rapeseed data.