Lombricomposta y composta de estiércol de ganado vacuno lechero como fertilizantes y mejoradores de suelo

the untreated manure of dairy cattle constitutes an important reservoir of pollutants, as it is among the main sources of pollution of the water table and soils. the objective of this study was to evaluate the use of compost and worm compost obtained from dairy cattle manure after a period of storage, on the assimilation of nutrients by lettuce (lactuca sativa l.). a second objective was to quantify changes in the physicochemical characteristics of the soil in order to reduce the use of chemical fertilisers and improve soil characteristics. six treatments were established: fertilisation with worm compost, compost, urea, urea + worm compost, urea + compost, and the control. the content of macro and micronutrients was assessed both in leaf tissue of lettuce and in the soil, including the analysis of mo, ph and da. a linear model was adjusted for the statistical analyses. an analysis of variance was carried out using proc glm, sas version 9.1, and the means were compared using the dunnett test. results showed that the nutritional content of leaf n in lettuce plants treated with compost and worn compost was similar to the equivalent contribution of inorganic nitrogen fertiliser. differences were observed in the leaf content of ca, mg, zn and mn with the different fertilisation techniques. the best conditions of mo and of macronutrient concentrations were obtained in the soils that were fertilised with worm compost and compost.