Resumo

CARDONA, William Andrés; BOLANOS BENAVIDES, Martha Marina  e  CHAVARRIAGA MONTOYA, William. Effect of chemical and organic fertilizers on the aggregation of a soil grown with Musa acuminata AA. Acta Agron. [online]. 2016, vol.65, n.2, pp.144-148. ISSN 0120-2812.  https://doi.org/10.15446/acag.v65n2.44493.

Aggregate stability is defined as the persistence of its particles, against destructive forces (climatic factors and anthropogenic activity). The aim of this research was to analyze the effect of fertilization on the structural stability of a soil grown with baby banana (Musa acuminata AA). This research was carried out in Manila and Asobaicotol farms (Icononzo, Tolima Department, Colombia); a randomized complete block design with four replications and eight treatments were performed; including compost, mycorrhiza, mineral fertilizers, fertilizer 17-6-18-2 (60 to 100g) and an absolute control (without fertilization). These soils performed medium aggregation (aggregated> 0.55mm) with values about 38.8%, percentage of aggregates extremes, among 40 - 50% and an aggregate stability about 80%; which allows classifying as very stable soils. The soil samples that received complete fertilization, compost + mycorrhiza and 60g of fertilizer 17-6-18-2; presented structural stability, class 3. MWD (Medium Weighted Diameter) higher values were obtained using only compost and mixed with mycorrhiza; in contrast, soils receiving mineral and chemicals fertilizers, showed poor structuring (MWD <0.5mm). Using the GMD (Geometrical Medium Diameter) more uniform values are observed than with the MWD. Finally, under all treatments, aggregates with diameter >0.75 mm did not exceed 50% and conversely, soil samples showed 20 - 30% of aggregates with diameter <0.25 mm. The results obtained allow show the positive effect of the application of compost and mycorrhiza on soil aggregation under study

Palavras-chave : Compost; mycorrhiza; aggregates; soil organic matter; exchangeable bases.

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