Utilization of the cropgro-soybean model to estimate yield loss caused by Asian rust in cultivars with different cycle
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2012
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In recent years, crop models have increasingly been used to simulate agricultural features. The DSSAT (Decision Support System
for Agrotechnology Transfer) is an important tool in modeling growth; however, one of its limitations is related to the unac-
counted-for effect of diseases. Therefore, the goals of this study were to calibrate and validate the CSM CROPGRO-Soybean for
the soybean cultivars M-SOY 6101 and MG/BR 46 (Conquista), analyze the performance and the effect of Asian soybean rust
on these cultivars under the environmental conditions of Viçosa, Minas Gerais, Brazil. The experimental data for the evaluation,
testing, and adjustment of the genetic coefficients for the cultivars, M-SOY 6101 and MG/BR 46 (Conquista), were obtained
during the 2006/2007, 2007/2008 and 2009/2010 growing seasons. GLUE (Generalized Likelihood Uncertainty Estimation)
was used for the estimation of the genetic coefficients, and pedotransfer functions have been utilized to estimate the physical
characteristics of the soil. For all of the sowing dates, the early season cultivar, M-SOY 6101, exhibited a lower variance in yield,
which represents more stability with regard to the interannual climate variability, i.e., the farmers who use this cultivar will have
in 50% of the crop years analyzed, a higher yield than a late-season cultivar. The MG/BR 46 (Conquista) cultivar demonstrated
a greater probability of obtaining higher yield in years with favorable weather conditions. However, in the presence of the Asian
soybean rust, yield is heavily affected. The early cultivar, M-SOY 6101, showed a lower risk of being affected by the rust and
consequently exhibited less yield loss considering the scenario D90 (condensation on the leaf surface occurs when the relative
humidity is greater than or equal to 90%), for a sowing date of November 14.
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DSSAT, Validation, Calibration, Modeling, Rust epidemics, DSSAT, Calibração, Modelagem, Epidemia de ferrugem, Validação
Citação
RODRIGUES, Rafael de Ávila; PEDRINI, João Eduardo; FRAISSE, Clyde William; FERNANDES, José Maurício Cunha; JUSTINO, Flávio Barbosa; HEINEMANN, Alexandre Bryan; COSTA, Luiz Cláudio; VALE, Francisco Xavier Ribeiro do. Utilization of the cropgro-soybean model to estimate yield loss caused by Asian rust in cultivars with different cycle. Bragantia, Campinas, v. 71, n. 2, p. 308-317, 2012.