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5255599 
Journal Article 
Expression et prédiction du pouvoir tampon des amendements et des engrais organiques 
Masso, C; Khiari, L 
2013 
Yes 
Canadian Journal of Plant Science
ISSN: 0008-4220 
Agricultural Institute of Canada 
Canadian journal of plant science 
93 
5 
595-606 
is also published as 2288242 Computation and prediction of the buffering capacity of organic amendments and fertilisers
Masso, C. and Khiari, L. 2013. Computation and prediction of the buffering capacity of organic amendments and fertilisers. Can. J. Soil Sci. 93: 595-606. The buffering capacity (BC) of organic substrates used in agriculture as soil amendments or organic fertilizers are of high interest to prevent adverse effects of mineral fertilizers in the application band near seeds or juvenile seedlings. This is the effect of ammonia, nitrous or aluminum toxicity caused by the sudden and temporary pH flux due to the application of these fertilizers. However, to our knowledge there is no standard method for computing of the BC of organic substrates. In this study, a method by integral calculation, called BCI, was developed and tested on 30 organic amendments and fertilizers (OAF) commonly used in agriculture in Québec. These OAF were titrated with variable rates of diluted H(2)SO₄ or NaOH. A linear and a punctual methods found in the literature were compared to BCI. The integral method was found more appropriate to OAF titration curves, particularly for determining the global BC, integrating the curves obtained during both the acid and alkaline treatments, which was not possible with the other two methods found in the literature. On average, the potential alkalinity of the 30 OAF was higher than the total exchangeable acidity. The globol BCI could be predicted with total Ca, exchangeable Ca, and total Al (r²=0.79). Likewise, the BCI to acidity could be predicted using total Ca, exchangeable Ca, and pHCₐC‚—(2) (r²=0.78). 
article; Acidity; alkalinity; buffering capacity; Organic amendments and fertilizers; adverse effects; alkali treatment; aluminum; ammonia; calcium; exchangeable calcium; fertilizer application; juveniles; mineral fertilizers; organic fertilizers; prediction; seedlings; sodium hydroxide; soil amendments; sulfuric acid; titration; toxicity