Aiming to evaluate effects of doses and timing of Chlormequat chloride (CCC) application in wheat, a field experiment was conducted in a distrophic red yellow podzolic soil located at Federal University of Santa Maria, RS, in 1989. Five doses were used, zero, 100, 200, 300 e 400g/ha of CCC applied at stages 4 (tillering), 7 (second visible node) and 10 (booting) and in parceled doses, using as source the commercial product Tuval (10% i.a). Increasing CCC rates increased harvest index and grain yield. The product was more effective when applied at growth stages 4 and 7. Parceling doses did not significantly affect plant characteristics or grain yield.
wheat; bio-regulator; Chlormequat chloride; CCC; Tuval
