Calibração e validação do modelo AquaCrap para as culturas de gliricídia e canafistula cultivadas no semiárido do Nordeste do Brasil.

Abstract

This study aimed to verify the efficacy of AquaCrop in estimating the modeling stages for gliricidia and canafistula cultures in the semi-arid northeast of Brazil. The experiment was carried out at the National Institute of the Semiarid - INSA in Campina Grande-PB, where two experiments took place, one for the rainy season and the other in the dry season, both in 2019, and the treatments were used the spacings T1 (1.0m x 1.0m), T2 (1.0m x 0.5m) and T3 (1.0m x 1.5m). There was also an evaluation of the characteristics of the plant seeking to understand its behavior and growth. The results were determined to simulate total biomass for both crops through AquaCrop, which generated different results for each treatment that was calibrated and validated by climate, soil, crop and management variables. Among the results found in this study, it was observed that the variables such as plant weight and canopy area showed significant differences between the two crops. The dry matter content was also evaluated: with a higher percentage for Canafistula, in relation to crude protein, Gliricidia presented higher values. The T1 treatment for Canafístula and Gliricidia showed a higher estimate of total biomass among the three treatments. Moreover, the simulation of the AquaCrop model was satisfactory because it presented excellent results in the simulation for the biomass of the studied crops.