In this research, the provision of N, P, K, Ca and Mg was determined through the litterfall of Bambusa vulgaris and Guadua angustifolia planted at the Experimental Campus of the Foundation for the Agriculture Research DANAC (San Javier, Yaracuy state, Venezuela) located at 10 degrees 21’45 ” N and 68 degrees 39’00 ” W and a height of 107 m.s.n.m. The leaf-litter decomposition was studied in both species, using decomposition bags. The comparison of the total annual values indicated contributions of 149.3 +/- 14.8 vs 65 +/- 16.6 kg.ha(-1)), P (25.3 +/- 4.2 vs 14.5 +/- 3.6 kg.ha(-1)), K (63 +/- 8.7 vs 30 +/- 7.8 kg.ha(-1)) and Ca (91 +/- 10 vs 53 +/- 7 kg.ha(-1)) significantly higher for bamboo (P < 0,05), though there were not differences regarding Mg (9.1 +/- 1.2 vs 7.2 +/- 1.9 kg.ha(-1)). The dynamic of the litterleaf decomposition showed similar tendencies in both species, with a declination of 76% of the initial necromass in bamboo, and 87% in guadua within 218 days of exposure. The decomposition constants were 3.93 estimated for bamboo, and 2.00 for guadua.