Resumo

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

Palavras-chave : Panicum maximum; grazing; soil.

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