Uso de parâmetros luminosos e altura de dossel para o manejo de precisão em cultivares de Urochloa

Abstract

The objective of this work was to use the luminosity parameters to have a precise management for the Urochloa hybrids, namely: Mavuno, Ipyporã, in addition to the genetic materials of Urochloa brizantha cv. Marandu and Urochloa ruziziensis cv. Ruziziensis. For this purpose, measurements of canopy height, light interception and leaf area index were performed. The work was carried out in the experimental area of the Agrostological Field of the Federal University of Grande Dourados (UFGD). During the present work, weekly measurements of canopy height and light interception (LI) and leaf area index (LAI) were performed. With these evaluations it is possible to correlate the different canopy heights with the light interception and the leaf area index of the new hybrids available in the market. Different heights of entry were observed for the cultivars depending on the period (water and drought), in addition, the LAI is directly related to the days of post-harvest (DPC), as the regrowth via photosynthesis has greater efficiency and speed when compared to the use the energy reserves of the plant. The light parameters evaluated in this study proved to be valuable tools for pasture management, especially for cutting management in Urochloa pastures. The performance of more precise cutting management through light parameters, associated with the adoption of specific strategies for different times and situations, can guarantee greater forage and food autonomy of the production chain of cattle or other ruminants on pasture.