Plant density and growth of forage maize genotypes.
Keywords:Hybrids, Zea mays L., leaf area index.
A study was conducted to identify genotypes of maize with
high forage potential. The fi rst experiment (E1) was conducted
from November 2007 to February 2008, evaluating the
genotypes H-520, HE-1A17, HE-2A15, V-556AC, VS-536,
A7573 and a native variety, at three densities (50000, 62500
and 83333 plants/ha) and with four replications. In a second
experiment (E2) (January to April 2009) the hybrids HE-
1A17 and 2A15 were excluded and H-564C was added.
The treatments were the combination of genotypes and
sowing densities, in a randomized block design. Analysis of
variance for each experiment were conducted, and combined
and comparison of means, by Tukey (P≤0.05). In the fi rst
experiment, the native genotype, average of densities, had
the highest plant height (E1=247, E2=216 cm), total leaf
area (E1=5834, E2=7516 cm2) and leaf area index (E1=3.8;
E2=4.9), stem diameter (E1= 6.6; E2=7.5 cm) and forage yield
(E1=44.3 t/ha). In the second experiment, H-564C (E2=36.6
t/ha) surpassed the control. The density of 83333 plants/ha,
average of genotypes, surpassed in forage yield (E1=35.8;
E2=37.3 t/ha) the density of 62500 plants and 50000 plants/
ha. For density, the maximum yield by genotype was
established at 83333 plants/ha in the native variety, which
produced 57 t/ha of forage. On average of the densities, the
maximum leaf area index was achieved with 83333 plants/ha,
and the lowest was obtained with 50000 plants per hectare.
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