Resumo

PERALTA-VERAN, Liliana; JUSCAMAITA-MORALES, Juan  e  MEZA-CONTRERAS, Víctor. Obtaining and characterising an organic liquid fertilizer due to the treatment of dairy farm cattle manure using a lactic acid microbial consortium. Ecol. apl. [online]. 2016, vol.15, n.1, pp.1-10. ISSN 1726-2216.

Animal production systems generate large amounts of excreta that cause negative environmental impacts. However, these are a source of nutrients for the production of organic fertilizers. The following research had the objective of proposing a rapid biological system (5 days) devised to obtain an agronomic organic fertilizer. Thus, 25 treatments (ET) were applied to initially pretreated fresh cattle manure in proportions up to 100% of molasses of sugar cane and lactic acid inoculum (B-lac) in ratios of 0, 5, 10, 15 and 20% (v/w) respectively. A Random Complete Design with factorial arrangement 5x5 was used and mean differences were established with Tukey and Least Square Means for the effect of molasses and B-lac. Treatments were evaluated for a period of 21 days and the results showed that T20 treatment (20 % molasses, 15 % B-lac and 65 %-lac ET) resulted in the best treatment which fulfilled elevated requirements of lower pH 4.02, higher acidity in shortest time of 2.06 % lactic acid. T20 was free of pathogens and had good agronomic properties of 4 200 mg L^-1 of nitrogen, 744 mg L^-1 of phosphorus and 17 200 mg L^-1 of potassium, 181 g L^-1 of organic material and a high content of micronutrients. The biotechnological treatment used enabled to provide a higher value to the excreta, transforming them into a stable, pathogen free agronomic organic fertilizer.

Palavras-chave : biol; manure treated; microbial consortium; lactic acid.

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