Iranian Journal of Field Crop Science

Iranian Journal of Field Crop Science

Prediction of emergence of Flixweed (Descurainia sophia) and Wild Oat (Avena fatua) using thermal time models in Winter Rapeseed (Brassica napus)

Document Type : Research Paper

Authors
Mohammad Ali Aboutalebian 1
Shahram Nazari 2
Farid Golzardi 3
1 Assistant Professor, Department of Agronomy and Plant Breeding, Faculty of Agriculture, Bu Ali Sina University, Hamedan, Iran
2 Ph. D. Candidate, Department of Agronomy and Plant Breeding, Faculty of Agriculture, Bu Ali Sina University, Hamedan, Iran
3 Assistant Professor, Seed and Plant Improvement Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran
10.22059/ijfcs.2017.63653
Abstract
A thermal time (TT) model was developed to simulate field emergence of two weed species (flixweed and wild oat) in winter rapeseed. Practical predictive weed emergence models can provide information about timing of weed emergence. Non-linear regression models are usually able to accurately predict field emergence under specific environmental conditions. In the present study, cumulative seedling emergence in response to TT was described by the Weibull, Logistic, Gompertz, Sigmoid and Chapman functions. Some criteria were used to describe the goodness of fit of the models. These criteria includ coefficient of determination (r2adj), root mean square of error (RMSE) and Akaike index (AIC). In both species (Descurainia sophia: RMSE= 3.65, r2adj=0.97, AIC=88.87; Avena fatua: RMSE= 2.59, r2adj=0.99, AIC=45.83) the seedling emergence flushes were well described with the Weibull four-parameter function. To start emergence after sowing and to reach maximum emergence, lower TT requirements were observed in A. fatua than in D. sophia. Seedling emergence increased steadily and reached from 50% to 90% of total emergence at 315 and 543 TT, respectively for D. sophia and 70 and 286 TT, respectively for A. fatua.
Keywords
Avena fatua
Descurania sophia
Soil temperature
Weibull model
Subjects
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Iranian Journal of Field Crop Science
Volume 48, Special Issue
Autumn 2017
Pages 55-65

  • Receive Date 06 April 2016
  • Revise Date 18 July 2016
  • Accept Date 21 November 2016
  • Publish Date 23 September 2017