Calibração e validação do modelo AquaCrop para a cultura leucena (Leucaena leucocephala (Lam.) de Wit) cultivada no semiárido do Nordeste Brasileiro.

Abstract

Agro metrological modeling has been used in the development of agricultural production in all regions of the world, assisting in decision making. The research was carried out with the leucaena leucephala (Lam.) Culture of Wit used for the production of forages used in animal feed. The experiment was carried out at the Professor Ignácio Salcedo Experimental Station, belonging to the Instituto Nacional do Semiárido - INSA, located in the rural area of Campina Grande, state of Paraíba, located in the mesoregion of Agreste Paraibano. The objective of the research was to determine the biomass productivity (B) by applying the modeling with the free software AquaCrop 6.1 developed by the United Nations Food and Agriculture Organization (FAO), the software calibration was performed through the input the conservative and non-conservative parameters for the study region and the validation of the model's performance for biomass density and productivity was determined using statistical indicators: Willmott's concordance index (d); root of the average error; root of the normalized mean square error; efficiency coefficient of the Nash-Sutcliffe model and the predication error, treatments were used in relation to the T1 (1.0 mx 1.0 m), T2 (1.0 m x 0.50 m) and T3 (1.5 m x 1.5m) for rainy and dry periods. It was also performed the determination of the morphometric variables of development of the species for the rainy and dry periods with randomized block design with factorial (2x3) using the mathematical models in the statistical modeling of analysis of variance, means compared by the Tukey test and the correlation . Consequently, bromatological analyzes were carried out to analyze the nutritional potential of leucena in animal feed in the face of variations occurring by agro meteorological factors.