Abstract
Abstract: The objective of this work was to calibrate and validate the AquaCrop model for the wheat (Triticum aestivum) crop in the Campos Gerais region, in Southern Brazil. Five cultivars were evaluated in the harvests from 2007 to 2017. The input data for AquaCrop - related to climate, crop, soil, and soil management -, collected in the field, were obtained from the database of Fundação ABC and from the literature. From 35 to 43% of total harvests were selected for calibration, and the remaining, for validation. Calibration was performed for the parameters most sensitive to crop potential yield penalty. The simulated yields were compared with those observed in the field through simple linear regression analysis, root mean square error (RMSE), Pearson’s correlation coefficient (r), the index of agreement (d), and the performance index (c). Calibration showed good results (RMSE ≤ 609.78 kg ha-1; r ≥ 0.72; d ≥ 0.80) for all assessed cultivars and locations, but validation did not have the same performance (c ≤ 0.46). The attempted adjustment, considering the range of calibrated parameters in the harvests, indicated “very good” and “excellent” performances (Supera and Quartzo, respectively) for the cultivars in Castro and “tolerable” to “excellent” in Ponta Grossa.
Highlights
Wheat (Triticum aestivum L.) is widely cultivated worldwide (FAO, 2018a)
The study was carried out using climate and wheat crop data obtained in the municipalities of Castro and Ponta Grossa, located in the Campos Gerais region, in the state of Paraná, in the subtropical zone of Southern Brazil, from 2007 to 2017
According to Köppen’s climate classification for Brazil (Alvares et al, 2013), Castro is classified as Cfa, a humid subtropical, oceanic climate without dry season and with a hot summer; and Ponta Grossa is classified as Cfb, a humid subtropical, oceanic climate without dry season and with a temperate summer
Summary
In Brazil, the use of wheat cultivars with a high potential productivity, combined with the country’s soil and climatic conditions, promotes high yields and crop expansion (Silva et al, 2014). The Campos Gerais region stands out in the state due to its agricultural potential, which is above the national average (Shimandeiro et al, 2008). Campos Gerais is located in the Southeastern and Southern regions of Brazil. It presents a territory band of 11,761.41 km with a northwest convexity (Melo et al, 2014). The region is characterized by agriculture focused mainly on grain production in the no-tillage system (Melo et al, 2014)
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