Effect of management factors on tiller dynamics in tall fescue: Tiller mortality

Abstract

The effect of plant density (row spacing / seeding rate), cultivar choice, nitrogen (N) fertilization and close-down date on tiller mortality in a dual purpose (forage and seed) tall fescue (Festuca arundinacea Schreb.) sward was examined over a two-year period. Cajun had a consistently lower (P<0.01) tiller mortality than Roa in both seasons. An increase in row spacing or a decrease in seeding rate reduced (P<0.01) tiller mortality. Tiller mortality increased with increased levels of N-fertilization. A relation between tiller age (time of origin) and mortality was identified. The youngest or least developed tillers were found to be less tolerant of stressful conditions than the older or better developed tillers. Tiller mortality was also shown to increase dramatically in spring, irrespective of the type of management applied.