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Influence of Intact Tillers and Height of Cut on Regrowth and Carbohydrate Reserves of Dallisgrass (Paspalum dilatatum Poir.)¹

Vegetatively propagated dallisgrass (Paspalum dilatatum Poir.) plants of a single clone were grown in the greenhouse and cut to a stubble height of 2.5- or 7.5-cm in a factorial combination of leaving 0, 10, 20, or 30% intact tillers. Higher daily and total regrowth yields resulted from decreasing the height of cut or leaving intact tillers. Total available carbohydrates increased as height of cut and percent intact tillers increased. Translocation of carbohydrates from intact tillers to new growth was demonstrated by treating the uncut tillers with C¹⁴ sucrose, glucose, and fructose, and following their movement at various time intervals with autoradiographs. Apparently 10% more intact tillers are sufficient for dallisgrass survival and growth under intensities of defoliation used in these studies.

Key Words: Total available carbohydrates • C¹¹ sugars • Autoradiographs

² Assistant Professor and Professor of Agronomy, Mississippi State University, State College.

Received for publication November 7, 1969.