Calidad nutricional de pastos king grass y maralfalfa en sistemas pastoriles inoculados con bacterias solubilizadoras de fósforo y fijadoras de nitrógeno.

Abstract

El uso indiscriminado de fertilizantes de síntesis química ha causado la degradación de los suelos ganaderos, lo que conlleva a la disminución de la cantidad y calidad de los forrajes destinados a la nutrición bovina. Por esta razón se evaluó la calidad nutricional de praderas mixtas de Maralfalfa y King Grass, inoculadas con bacterias solubilizadoras de fósforo y fijadoras de nitrógeno. El estudio se llevó a cabo en la vereda Barcelona, Villavicencio-Meta. En un diseño de bloques completos al azar con tres repeticiones y siete tratamientos, se estableció el ensayo con pasturas mixtas con y sin inoculación bacteriana. Se realizó un análisis bromatológico mediante el uso de la espectrometría NIRS de las praderas mixtas, evaluando la producción de materia seca (MS), proteína cruda (PC), fibra detergente neutro (FDN), fibra detergente acido (FDA), extracto etéreo (EE), ceniza (C) y lignina (L). Se realizaron cortes de homogeneización y toma de muestra a los 45 y 90 días.

The indiscriminate use of chemical synthesis fertilizers has caused the degradation of livestock soils, leading to a decrease in the quantity and quality of forage for bovine nutrition. For this reason, the nutritional status of mixed Maralfalfa and King Grass meadows, inoculated with phosphorus-solubilizing and nitrogen-fixing bacteria, was evaluated. The study was carried out in the village of Barcelona, Villavicencio-Meta. In a randomized complete block design with three replicates and seven treatments, the trial with mixed pastures with and without bacterial inoculation was established. A bromatological analysis was performed using the NIRS spectrometry of the mixed meadows, evaluating the production of dry matter (MS), crude protein (PC), neutral detergent fiber (FDN), acid detergent fiber (FDA), ethereal extract (EE), ash (C) and lignin (L). Homogenization cuts and sampling were made at 45 and 90 days. The results showed that the dry matter (DM) yield was reduced with a longer cutting time, obtaining its highest percentage 30.40% at 45 days of age, as well as, crude protein (PC) 21.79% in the inoculated treatment + 75% chemical fertilization. The FDA acid detergent fiber obtained values in the absolute control of 29.99 and 33.74 in the 45 and 90 cut-off days