| Sumari: | In Mexico the commercial substrates more utilized for the forest seedlings production are Peat Moss, agrolite and vermiculite, however, their costs are high which makes the utility margins decrease; therefore, alternative substrates capable of promoting good quality seedlings are sought. The residues from the production of Shiitake mushroom (Lentinula edodes) have not yet been characterized for their utilization in forestry-related uses. In the present research, a physical-chemical and bacteriological characterization of the compost obtained from the residues of Shiitake mushroom production was performed to evaluate seedling nursery production of Pinus pseudostrobus. Compost showed a N content of 1.14 mg kg-1 (1.14 ppm), 0.80 mg kg-1 (0.80 ppm) of K, P 0.18 mg kg-1 (0.18 ppm), 93.60% of MO and an electrical conductivity of 3.82 mS / cm. Additionally, it presented 3.6x104 of CFU/g, being Pseudomonas and Klebsiella the most abundant genus, with 1.08 × 104, representing 60% of the total bacterial load. The Dickson quality index for treatment 3 (Shiitake residue compost 50%+ vermiculite 33% + 33% perlite) was 0.27, exceeding the control treatment (0.24). According to the obtained data, compost made from residues of Shiitake mushroom production, can contribute to the forestry sector for the production of quality seedlings of Pinus pseudostrobus in nursery.
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