This study evaluates the balance of species 2 mo after sowing, its effects on seasonal and annual dry matter accumulation of
Plantago lanceolata
L. 'Ceres Tonic' sown in pure stands, in binary mixtures with three grasses, and different initial growth
rates: annual ryegrass (
Lolium multiflorum
Lam.), tall fescue (
Festuca arundinacea
Schreb.), and orchard grass (
Dactylis
glomerata
L.). Plantain monocultures were sown at three densities (4, 8, and 12 kg seed ha
-1), while halved densities were
used in the mixtures. Each grass was sown at the density that is typical for the region (annual ryegrass = 30, tall fescue =
15, and orchard grass = 6 kg seed ha
-1). The trial was carried out in Balcarce (37°45' S, 58°18' W; 130 m a.s.l.), Argentina
in 1.4 × 5 m plots sown in April 2005 with a randomized complete block design, a factorial arrangement of pasture type
and plantain sowing density, and seasons as a measurement repeated over time. Plant density 2 mo after sowing was not a
good estimator of the balance between species for all pasture types at the end of the first year. Total forage accumulation
throughout the experimental period was affected by pasture type (p = 0.08) and plantain sowing density (p < 0.05), but not
by their interaction (p > 0.05). The plantain and annual ryegrass mixture accumulated 28% more biomass than the mean
biomass of all the other pastures (7948 ± 647 vs. 6204 ± 502 kg DM ha
-1) mainly because of its higher yield in fall and
winter. Total precipitation during the year under study was 15% lower than the historic average so that higher accumulations
could be expected in years with higher precipitation.
