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Acidification of composts from agricultural wastes to prepare nursery potting mixtures

Publicado en:Acta Horticulturae. 779 (779): 333-+ - 2008-01-01 779(779), DOI: 10.17660/ActaHortic.2008.779.41

Autores: Carrión, C; Abad, M; Fornes, F; Noguera, V; Puchades, R; Maquieira, A; Botella, S; García, R

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The effects of powdered elemental sulfur (S-0) and ferrous sulfate (FeSO4 center dot 7H(2)O) on the pH of three alkaline composts prepared with residual vegetable crop biomass (melon, Cl; pepper, C2 and zucchini, C3) were investigated. Composts reacted differently to the application of the amendments, the acidification efficiency averaging 43%, 50% and 36% for Cl, C2 and C3, respectively. S-0 was more efficient than FeSO4 center dot 7H(2)O for lowering the pH, and a saturation-like effect was found within the range of amendment rates studied. The pH decrease ranged-from 0.24 to 3.03 units. This pH reduction was paralleled by an increase in compost salinity, especially with S-0. pH declined slowly and gradually with S-0, whereas FeSO4 center dot 7H(2)O decreased pH soon after its application, followed by a progressive increase and subsequent stabilization. When S-0 was added to the compost, the sulfur-oxidizing bacteria population increased from 10(7) to 10(10) CFU/g during the first 50 days of incubation, followed by a significant decrease. This initial increase in bacterial population paralleled the pH decrease observed.

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