Estimation of the Primary Net Production above Ground through Remote Sensing in a Pastoral System of the Colombian Altillanura.

The primary net production above ground (ANPP) represents the main forage resource that supports the bovine production systems and its valuation is essential to help in the decision making on the management of the pastures. The ANPP has been estimated by periodic biomass courtesy, but with the use of the remote sensor integrated into the efficiency model formulated by Monteih (1972), it has been possible to estimate this biophysical parameter more efficiently at different scales and at low cost. The objective of this study was to estimate the PPNA based on a model of efficiency in the use of light for pastoral coverage in the Colombian Altillanura. The work is in the Carimagua Research Center of the Colombian Agricultural Research Corporation –AGROSAVIA– located in the municipality of Puerto Gaitán - Meta, Colombia. The pasture was monitored through forage supply gaps, in 14 paddocks with an approximate area of 2.6 ha each, established with Urochloa humidicola CIAT 6133 c.v Llanero under grazing of cattle with rest periods of 28 to 30 days. The spectral information was obtained from the on-board Sentinel 2 sensor and the global radiation data was obtained from a field weather station. A PPNA observed in the field and estimated by the efficiency model of 603.79 ±189kgDM/ha ± 188 and de 589.22 ±104 kgDM/ha was found, with a coefficient of determination R2 (0.79) and a significant correlation p \u3c 0.01 of 0.89. This methodology would quantify the supply of fodder on a larger scale under the same type of pastures