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Mathematical Modeling and Optimization of Physical Properties of Paddy as Influenced by Drying

Mathematical Modeling and Optimization of Physical Properties of Paddy as Influenced by Drying

Shakeel Ahmed Soomro1,2, Sikandar Almani3, Lal Bux4, Khalil Ahmed Ibupoto2, Muhammad Sohail Memon2, Farman Ali Chandio2, Shakeel Hussain Chattha2, Zaheer Ahmed Khan2, Zubair Ahmed Soomro5,Babar Mustafa Ansari6 and Kunjie Chen1*

1College of Engineering, Nanjing Agricultural University, Nanjing 210031, China; 2Faculty of Agricultural Engineering, Sindh Agriculture University, Tandojam 70060, Pakistan; 3Department of Chemical Engineering, Mehran University of Engineering and Technology, Jamshoro 76020, Pakistan; 4Shaheed Benazir Bhutto University, Shaheed Benazirabad 67450, Pakistan; 5Faculty of Animal Husbandry and Veterinary Sciences, Sindh Agriculture University, Tandojam 70060, Pakistan; 6Khairpur College of Agricultural Engineering and Technology, Khairpur, Pakistan.

*Correspondence | Kunjie Chen, College of Engineering, Nanjing Agricultural University, Nanjing 210031, China; Email: 


Present study was conducted to assess the effect of drying on physical properties of Nanjing 9108 paddy variety using response surface methodology. A mathematical model was used predicting the effects of indicators i.e. temperature (40.86, 45, 55, 65 and 69.14 ºC) and time (4.11, 30, 92.5, 155 and 180 min) each with five levels on observed parameters. The suitability of quadratic model for present study was described by the responses having acceptable R2 and Adj. R2 values, non-significance of lack of fit which compares residual to pure error and significance of analysis of variance which is essential for testing the applicability of the model. Predicted optimum temperature and time were 63 ºC and 142.5 min respectively and predicted length, width, thickness, TKW, bulk density, true density, porosity and hardness under these conditions were 6.72mm, 3.32mm, 2.27mm, 27.38 g, 716.78 kg m-3, 1459.14 kg m-3, 51.24% and 45.26 N respectively. The results further revealed that the effect of temperature and time on paddy decreased with process except porosity and hardness, which increased as affected by these conditions. The results showed that the model work was valid for predicting the responses being affected by the indicators, and optimizing the physical properties of paddy. Central composite design of response surface methodology was successfully used studying the dependence of physical properties of paddy. The valuable results of this study can be utilised by the rice processing industries. 

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Pakistan Journal of Zoology


Vol. 53, Iss. 3, Pages 801-1200


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