Simulating maize phenology as a function of air temperature with a linear and a nonlinear model

Pesquisa Agropecuária Brasileira

Nereu Augusto Streck¹  Isabel Lago¹  Luana Fernandes Gabriel¹  Flavia Kaufmann Samboranha¹ 

[1],Universidade Federal de Santa Maria Centro de Ciências Rurais Departamento de FitotecniaSanta Maria RS

关键词: Zea mays;    degree days;    development;    modeling;    thermal time;    Zea mays;    graus-dia;    desenvolvimento;    modelagem;    soma térmica;   

DOI  :  10.1590/S0100-204X2008000400002

来源: SciELO

【 摘 要 】

The objective of this study was to adapt a nonlinear model (Wang and Engel - WE) for simulating the phenology of maize (Zea mays L.), and to evaluate this model and a linear one (thermal time), in order to predict developmental stages of a field-grown maize variety. A field experiment, during 2005/2006 and 2006/2007 was conducted in Santa Maria, RS, Brazil, in two growing seasons, with seven sowing dates each. Dates of emergence, silking, and physiological maturity of the maize variety BRS Missões were recorded in six replications in each sowing date. Data collected in 2005/2006 growing season were used to estimate the coefficients of the two models, and data collected in the 2006/2007 growing season were used as independent data set for model evaluations. The nonlinear WE model accurately predicted the date of silking and physiological maturity, and had a lower root mean square error (RMSE) than the linear (thermal time) model. The overall RMSE for silking and physiological maturity was 2.7 and 4.8 days with WE model, and 5.6 and 8.3 days with thermal time model, respectively.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License