Response of tall fescue free and infected with endophyte in pure pastures and in mixture with legumes under two frequencies of defoliation
Abstract
The objectives of the present work were to compare the effect of two defoliation frequencies on the aerial biomass accumulation of a) pure stands of two types of Schedonorus arundinaceus (tall fescue), one from seed harvested from randomly selected individual plants of a natural pasture infected with wild endophyte Epichloë coenophiala (FNE+) and another from a commercial endophyte-free cultivar (FCE-) (Experiment 1) and b) mixed stands of FCE- and FNE+ with legumes (Lotus tenuis and Trifolium repens) (Experiment 2); and c) tall fescue root biomass production in pure and mixed stands above. Two field experiments were carried out. The experiments were conducted in a completely randomized design with a factorial arrangement of two factors: type of tall fescue (FNE+ and FCE-) and frequency of defoliation (AF: high; BF: low), with three replicates. Five and 9 cuts were carried out in BF and AF treatments, respectively (cutting height 70 mm from the ground level). Immediately after the last aerial biomass harvest, tall fescue root biomass was determined in both experiments. Along the experimental period total accumulated aerial biomass production of tall fescue stands (both in pure and mixed stands) was not affected (p>0.05) by the frequency of defoliation nor the type of tall fescue. No significant effects (p>0.05) of the frequency of defoliation and type of tall fescue were detected on root biomass of tall fescue, neither in pure nor in mixed stands.
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