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Modeling seed dormancy release and germination for predicting Avena fatua L. field emergence: A genetic algorithm approach

Author

Listed:
  • Blanco, Aníbal M.
  • Chantre, Guillermo R.
  • Lodovichi, Mariela V.
  • Bandoni, J. Alberto
  • López, Ricardo L.
  • Vigna, Mario R.
  • Gigón, Ramón
  • Sabbatini, Mario R.

Abstract

Avena fatua is a cosmopolite weed species which produces severe yield losses in small-grain production systems in temperate and semiarid climates. In the semiarid region of Argentina, A. fatua field emergence patterns show great year-to-year variability mainly due to the effect of highly unpredictable precipitation regimes as well as a complex seedbank dormancy behavior regulated by both, genetic and environmental factors. Previously developed models for the same agroecological system based on Non-Linear Regression techniques (NLR) and Artificial Neural Networks (ANN) were either unable to accurately predict field emergence or lacked explanatory power. The main objective of the present work is to develop a simple (i.e. parsimonious) model for A. fatua field emergence prediction for the semiarid region of Argentina based on the disaggregation of the dormancy release phase from the germination/pre-emergence growth processes, using easy accessible soil microclimate derived indices as input variables and observed cumulative field emergence data as output variable. The parsimony and predictive capability of the newly developed model were compared with NLR and ANN approaches developed by the same authors for the same agroecological system. Specifically, dormancy release was modeled as a logistic function of an after-ripening thermal-time index while germination/pre-emergence growth was represented by a logistic distribution of hydrothermal-time accumulation. A total of 528 input/output data pairs corresponding to 11 years of data collection were used in this study. Due to its implementation simplicity and good convergence features, a Genetic Algorithm (GA) was adopted to solve the resulting optimization problem consisting on the minimization of the Mean Square Error (MSE) between training data and experimentally obtained field emergence data. The newly developed GA based approach resulted in a significantly more parsimonious model (BIC=−1.54) compared to ANN (BIC=−1.36) and NLR (BIC=−1.32) models. Model evaluation with independent data also showed a better predictive capacity of the GA approach (RMSE=0.07) compared to NLR (RMSE=0.19) and ANN (RMSE=0.11) alternatives. These outcomes suggest the potential applicability of the proposed predictive tool in weed management decision support systems design.

Suggested Citation

  • Blanco, Aníbal M. & Chantre, Guillermo R. & Lodovichi, Mariela V. & Bandoni, J. Alberto & López, Ricardo L. & Vigna, Mario R. & Gigón, Ramón & Sabbatini, Mario R., 2014. "Modeling seed dormancy release and germination for predicting Avena fatua L. field emergence: A genetic algorithm approach," Ecological Modelling, Elsevier, vol. 272(C), pages 293-300.
    • Handle: RePEc:eee:ecomod:v:272:y:2014:i:c:p:293-300
    DOI: 10.1016/j.ecolmodel.2013.10.013
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    References listed on IDEAS

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    1. repec:bla:ecorec:v:69:y:1993:i:206:p:233-38 is not listed on IDEAS
    2. Gardarin, Antoine & Dürr, Carolyne & Colbach, Nathalie, 2012. "Modeling the dynamics and emergence of a multispecies weed seed bank with species traits," Ecological Modelling, Elsevier, vol. 240(C), pages 123-138.
    3. De Gooijer, Jan G. & Kumar, Kuldeep, 1992. "Some recent developments in non-linear time series modelling, testing, and forecasting," International Journal of Forecasting, Elsevier, vol. 8(2), pages 135-156, October.
    4. Lodovichi, Mariela V. & Blanco, Aníbal M. & Chantre, Guillermo R. & Bandoni, J. Alberto & Sabbatini, Mario R. & Vigna, Mario & López, Ricardo & Gigón, Ramón, 2013. "Operational planning of herbicide-based weed management," Agricultural Systems, Elsevier, vol. 121(C), pages 117-129.
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