Author(s): MONTEIRO, J. E. B. de A.; AZEVEDO, L. da C.; ASSAD, E. D.; SENTELHAS, P. C.

Summary: The objective of this work was to evaluate an estimation system for rice yield in Brazil, based on simple agrometeorological models and on the technological level of production systems. This estimation system incorporates the conceptual basis proposed by Doorenbos & Kassam for potential and attainable yields with empirical adjusts for maximum yield and crop sensitivity to water deficit, considering five categories of rice yield. Rice yield was estimated from 2000/2001 to 2007/2008, and compared to IBGE yield data. Regression analyses between model estimates and data from IBGE surveys resulted in significant coefficients of determination, with less dispersion in the South than in the North and Northeast regions of the country. Index of model efficiency (E1') ranged from 0.01 in the lower yield classes to 0.45 in higher ones, and mean absolute error ranged from 58 to 250 kg ha-1, respectively.

Publication year: 2013

Types of publication: Journal article

Unit: Embrapa Grape & Wine

Keywords: Arroz, Clima, Crop simulaton model, Crop yield forecast, Deficiência hídrica, Eficiência do modelo, Eficiência do moldelo, Meteorologia, Model efficiency, Modelo agroecológico, Modelo de simulação, Modelo de simulação de cultura, Previsão de safra, Water deficit