Potential Use of a poultry manure digestate as a Biofertiliser: evaluation of soil properties and Lactuca sativa growth

Anaerobic digestion is a process that is widely used for the treatment of organic wastes. The digestate can be used as a soil amendment or crop fertiliser. The aims of our work were to evaluate 1) the physicochemical composition and pathogen content in a digestate from poultry manure, according to international regulations, and 2) the effect of its soil application on the major chemical and biological soil properties and on the growth of Lactuca sativa. The experiment consisted of two groups of pots (with and without crop). Treatments applied to each group were as follows: low and high doses of digestate and inorganic fertiliser, and no application (control) (low dose: 70 kg nitrogen (N) ha􀀀1 and 21 kg phosphorus (P) ha􀀀1; high dose: 210 kg N ha􀀀1 and 63 kg P ha􀀀1). Soil samples were taken 7 and 34 d (harvest) after treatment applications. Heavy metal and pathogen contents in the digestate were below the upper limit values. Despite the high pH and electrical conductivity values of the digestate, both soil parameters presented acceptable values for crop growth. Although there were no initial increases in total inorganic N and available P in soil with digestate application, an increase in the fresh weight of crop was observed with the high dose application. This is probably associated with the slow nutrient release from the digestate during the development of the crop. Changes in the microbial community were temporary and occurred at the initial sampling stage of the experiment.

Fil: Romaniuk, Romina Ingrid. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Suelos; Argentina

Fil: Cosentino, Vanina Rosa Noemi. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Suelos; Argentina.

Fil: Eiza, Maximiliano Joaquin. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Suelos; Argentina

Fil: Carfagno, Patricia. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Suelos; Argentina

Fil: Rizzo, Pedro Federico. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Microbiología y Zoología Agrícola. Laboratorio de Transformación de Residuos; Argentina

Fil: Bres, Patricia Alina. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Microbiología y Zoología Agrícola; Argentina

Fil: Riera, Nicolas Iván. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Microbiología y Zoología Agrícola; Argentina

Fil: Butti, Mariano. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Ingeniería Rural; Argentina.

Fil: Sainz, Daiana Soledad. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Suelos; Argentina

Fil: Brutti, Lucrecia Noemi. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Suelos; Argentina.

Fil: Mortola, Natalia Andrea. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Suelos; Argentina

Fil: Roba, Marcos Andrés. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Ingeniería Rural; Argentina