EFFECT OF MOUNTAIN MICROORGANISMS ON DECOMPOSITION AND NUTRIENT RELEASE IN TWO GREEN MANURES

The aim of this research was to evaluate the decomposition and release of nitrogen, phosphorus, and potassium in the biomass of two green manures: Canavalia ensiformis (L.) and Mucuna deeringiana (Bort) Merr. After incubation in the soil, they were treated with mountain microorganisms (MM). An experiment was proven in the experimental agricultural field of the Faculty of Agronomic Sciences of the Autonomous University of Chiapas, Mexico, in Villaflores, Chiapas. The decomposition bag technique was used, and the following treatments were evaluated: C. ensiformis+MM, C. ensiformis- MM, M. deeringiana+MM, and M. deeringiana-MM. A randomized block design with a factorial arrangement was used; each bag with 10 g of dry matter inside was buried 15 cm deep in the soil. Three bags per treatment (six samplings) were removed every two weeks from the soil. The material was recovered, and the remaining dry biomass was quantified by difference. N was determined by the Kjeldahl method, P by colorimetry and K by atomic absorption spectrophotometry. Significant differences (p < 0.05) in the evaluated variables showed a gradual decomposition and nutrient release trend. C. ensiformis+MM showed higher decomposition with 97.68% and 93.02% in C. ensiformis-MM, while M. deeringiana+MM, and M. deeringiana-MM obtained 83.94% and 82.82%. The release of N, P, and K, irrespective of treatments, showed ranges of 44.77-253.97, 8.13-44.49 and 4.75-27.35 mg/10 g green manure, respectively. The application of MM in green manures accelerated their decomposition, and release of nutrients to the soil.