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- [30] DERIVATION OF A MODEL FUNCTION FOR THE DESCRIPTION OF THE INFLUENCE OF EAR NUMBER PER SQUARE METER AND NITROGEN-FERTILIZER RATE ON THE GRAIN NUMBER PER EAR IN WINTER-WHEAT ARCHIV FUR ACKER UND PFLANZENBAU UND BODENKUNDE-ARCHIVES OF AGRONOMY AND SOIL SCIENCE, 1987, 31 (05): : 335 - 341