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Pastos y Forrajes

Print version ISSN 0864-0394

Abstract

MACHADO, R. Performance of 19 Panicum maximum Jacq. accessions under grazing conditions on a moderate fertility soil . Pastos y Forrajes [online]. 2013, vol.36, n.2, pp.202-208. ISSN 0864-0394.

The objective of this work was to determine the performance of 19 Panicum maximum accessions on moderate fertility soils. A randomized block design was used with three repetitions and 20 m2 plots. The rotations (simulated rational grazing) were made between 60 and 70 days (dry season) and between 32 and 40 days (rainy season). An acceptable variability was detected among treatments (70,7 %). The most variable indicators were: availability, utilization percentage, leaf percentage and plant height. A cluster analysis was applied and two groups were formed: giant types (group 1) and medium types (group 2). The treatments of group 1 reached a mean availability of 5,0 t DM/ha/rotation and exceeded in 0,7 t DM/ha/rotation those of group 2. However, the latter showed lower symptoms of chlorosis (34,0 %), were more tolerant to pathogen microorganisms (25,0 %) and were less affected by drought (42,0 %) and showed higher vigor (3,8) as mean of the three years. It is concluded that availability, height, leaf percentage and utilization percentage had a main role in variability. The other indicators were relatively little variable, but they also allowed to judge the performance of these materials. The medium types CIH-6, SIH-810 and CIH-22 are recommended as pre-commercial varieties for similar conditions as the ones in this work, as well as to include the giant type SIH-759 in trials in which cutting or grazing is used with higher intensity

Keywords : Panicum maximum; grazing; soil.

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