Evaluación de la producción de biomasa y concentración de nutrientes en Acacia decurrens a diferentes alturas de corte en un sistema silvopastoril intensivo en trópico alto

Abstract

The present work consisted of studying the viability of Acacia decurrens as a forage alternative for ruminants in the High Tropics, based on the analysis of nutrient concentration and biomass production, comparing three different cutting heights (60 cm, 90 cm and 120 cm). This study was carried out in lot 18 of the Agricultural Biotechnology Center of SENA in Mosquera, department of Cundinamarca. In lot 18, of 4200 m2 (square meters) that was part of (SSPi), a randomized complete block design was carried out for which 3 homogeneous plots were chosen in terms of size (360 m2) and conditions. In each plot, 2 trees were chosen that were cut to 60 cm, 2 trees that were cut to 90 cm and 2 trees that were cut to 120 cm, weighing the biomass obtained on a fresh basis on a dry basis. After each weighing after the dehydration process by the permanence of the biomass for 30 days at room temperature, the weight of the dry matter was determined. There were 4 court instances, the first in March 2019 for administrative reasons, the project had an impasse of 6 months. The second moment was in August 2019, the third in September and the fourth was in October 2019. From the biomass measurement, pools of the last 3 cutting instances were sent with samples of each cutting measure in each instance, making the bromatological studies and, from them, obtaining the nutritional characteristics of each cut. After weighing the forage both on a wet basis and on a dry basis, the analysis of variance and percentage calculations concluded that there are slight quantitative differences between the different forage cuts, expressing a greater amount of biomass in cuts at 60 cm than in cuts at 90 cm and 120 cm. From the bromatological study of the material on a dry basis, the forage cut at 90 cm resulted in a higher concentration of nutrients than the forage cut at 60 and 120 cm.