Calibration and evaluation of new irrigated rice cultivars in the SimulArroz model¹

Calibração e avaliação de novas cultivares de arroz irrigado no modelo SimulArroz

ABSTRACT

Given genetical coefficients need to be calibrated for the most important cultivars on the market, new cultivars must be added to models such as SimulArroz. Thus, the aim of this study was to calibrate and evaluate the SimulArroz model for two new irrigated rice cultivars. The experiments were conducted in the municipality of Goianira in Goiás state during four growing seasons (2014/15, 2015/16, 2016/17, 2017/18) and in Rio Grande do Sul state in the municipalities of Alegrete (2015/16), Cachoeirinha (2015/ 16), Capão do Leão (2016/17, 2017/18), Santa Vitória do Palmar (2017/18) and Uruguaiana (2014/15, 2015/16). A randomized block design was used, with four replicates in Rio Grande do Sul and sowing plots in Goianira. The BRS Catiana and BRS Pampa cultivars were used and the Haun stage (HS), phenology, shoot dry matter biomass and yield were evaluated. The root mean square error (RMSE) for above-ground dry matter ranged from 51.7 to 577 g m^-2, and for yield, the normalized root mean square error (NRMSE) ranged from 24 to 32% and 22 to 35% for the potential and high technological levels, respectively. The SimulArroz model was able to satisfactorily predict the growth, development, and yield of the BRS Catiana and BRS Pampa cultivars, increasing their area of application, including the tropical region of Brazil.

Key words:
Oryza sativa L.; modeling; new cultivars; phenology

HIGHLIGHTS:

Adding irrigated rice cultivars to the SimulArroz model is vital to improve the robustness of new genetics and environments.

Calibrations predicted adequate growth, development, and yield for the ‘BRS Catiana’ and ‘BRS Pampa’ cultivars.

The SimulArroz model can also estimate phenological stages and grain yield in tropical conditions in Brazil.