Avaliação da produção e composição morfológica de cultivares de megathyrsus maximus na amazônia legal.

Abstract

The objective was to evaluate the production potential of nine cultivars of Megathyrsus maximus in the Amazon biome under cut. The experimental period was from November 2020 to March 2021 and the accumulated rainfall for the period was 1589 mm, in soil classified as Yellow Dystrophic Latosol, and the region's climate as tropical Aw. The experimental area was implanted in February 2019 and corrected according to the interpretation of the soil analysis. The cultivars Tobiatã, Tanzania, Mombasa, Massai, Zuri, Tamani, Kenya, Paredão and a new hybrid material that presents the code PM175, in 3m2 plots (2 x 1.5m), in planting lines spaced 50 cm in 4 repetitions totaling 36 experimental units in a completely randomized design. The height of the residue was 20 cm for the cultivars Massai and Tamani, 30 cm for the cultivars Kenya and Tanzania, and for the others the height of 40 cm was adopted. The protocol for the evaluations had an average of 41 days of rest. For the accumulation of forage and morphological components, there was no statistical difference between cultivars, as well as for the rate of forage accumulation and leaf blade accumulation rate. There was a statistical difference for the stalk percentage for the cultivars Kenya, Massai and Zuri, with the highest values, and for leaf blade percentage these three cultivars there was a statistical difference where the same three cultivars had the lowest values. Both cultivars showed high potential to be cultivated in the Amazon biome for the practice of beef cattle grazing.