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Selecting Best Double Sigmoid Function to Describe Growth and Growth Rate of Rapeseed Under Water Stress

International Journal of Plant Production, 2018, Vol.12(4), pp.225-241 [Peer Reviewed Journal]

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  • Title:
    Selecting Best Double Sigmoid Function to Describe Growth and Growth Rate of Rapeseed Under Water Stress
  • Author: Shabani, Ali ; Sepaskhah, Ali ; Kamgar-Haghighi, Ali
  • Found In: International Journal of Plant Production, 2018, Vol.12(4), pp.225-241 [Peer Reviewed Journal]
  • Subjects: Double sigmoid function ; Winter rapeseed ; Water stress
  • Language: English
  • Description: Dry matter accumulation pattern of winter cereals and rapeseed is similar to double sigmoid growth curve and can be described by sum of two different or similar singular sigmoid (S-shape) functions (e.g., Richards, Von Bertalanffy, and other functions) that they have overlap on one point. In this study, accuracy of 49 different function compositions of double sigmoid function for describing the rapeseed dry matter based on days after planting (DAP) and growing degree days (GDD) were tested. Results of this study showed that the Beta–Richards and Richards–Gompertz functions were fitted to the measured dry matter during growing season very accurately based on DAP and GDD, respectively. Sum of two Von Bertalanffy or Weibull functions can not describe the winter rapeseed growth. Results of this investigation can be used to estimate dry matter of rapeseed during growing season and analysis of plant growth rate variation under different irrigation treatments.
  • Identifier: ISSN: 1735-8043 ; E-ISSN: 1735-6814 ; DOI: 10.1007/s42106-018-0019-x

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