“…Ethephon, CCC, and mepiquat chloride, alone and in mixtures, stimulated tillering and occasionally increased the number of spike‐bearing tillers (Cartwright and Waddington, 1982; Koranteg and Matthews, 1982; Waddington and Cartwright, 1986; Naylor and Saleh, 1987; Woodward and Marshall, 1987, 1988; Craufurd and Cartwright, 1989; Ramos et al, 1989; Ma and Smith, 1991; Moes and Stobbe, 1991; Peltonen and Peltonen‐Sainio, 1997). In some experiments, this resulted in higher grain yield (Cartwright and Waddington, 1982; Waddington and Cartwright, 1986; Ramos et al, 1989; Peltonen and Peltonen‐Sainio, 1997), whereas in others it did not (Woodward and Marshall, 1988; Foster et al, 1991; Ma and Smith, 1991; Moes and Stobbe, 1991). Increase in tiller formation may be due to changes in responsiveness to day length (Hutley‐Bull and Schwabe, 1982; Craufurd and Cartwright, 1989), inhibition of biosynthesis and transport of apical dominance initiating auxins (Morgan and Gausman, 1966; Lyon, 1970; Evans, 1984), or changes in assimilate and nutrient availability (Woodward and Marshall, 1987, 1988).…”