ϱ dominance and Regge coupling in inclusive reactions

The ? Regge pole residues are calculated under the assumption of ? dominance of the isovector, even G parity component of inclusive reactions. The calculated residues compare well with total cross section data and allow successful predictions of the charge dependence of pion production in the central region. Serious difficulties are encountered with the assumption of P + f dominance of the isoscalar even G parity component.