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FREE ORGANIC MATTER (BAGASSE) DECOMPOSITION IN SOILS OF TWO CONTRASTED TROPICAL AREAS (GUADELOUPE, FRENCH WEST INDIES) Kinetic of dry matter (d.m.) disappearance of one year old bagasse, (C/N = 57) buried at 20 cm, in porous double packing was studied in two culture areas with very different rainfall of insular tropical climate : calcareous vertisol of Grande-Terre (G.T.), provided un Ν, Ρ and Ca ; acid ferralsol of Basse-Terre (B.T.), with low Ν content and deficient in Ρ and K. 30 samplings were carried out, with a cumulated rainfall in B.T. (2360 mm) twice that read in G.T. (1140 mm). The kinetics of d.m. disappearing showed the same general pattern. After 231 days 5 percent of d.m. bagasse in B.T. and 30 percent in G.T. were left. Disappearance curve fitted well with an exponential fonction according to time and to cumulated rainfall. Half-lives differed significantly and were shorter in B.T. (54 days) than in G.T. (141 days). Cumulated precipitations were regularly distributed amongst the 8 months of the experiment. So, parameters of the exponential adjustment were the same for both stations. According to this model 50 per cent d.m. bagasse was left with 600 mm rainfall.

DECOMPOSITION DE LA MATIERE ORGANIQUE LIBRE (BAGASSE) DANS LES SOLS DE DEUX ZONES TROPICALES CONTRASTEES (GUADELOUPE, ANTILLES FRANÇAISES)