Establishment and verification of prediction models for evaluating the physical and chemical properties of soilless substrates

Binbin Gong, Ning Wang, Tiejun Zhang, Shao Li, Xiaolei Wu, Jing Tian, Jingrui Li, Guiyun Lyu, Hongbo Gao

Abstract


In soilless culture, a suitable mixed substrate that provides a balanced and stable rhizosphere environment is vital for promoting plant growth. The present study was undertaken to establish seven prediction models of physical and chemical properties, including bulk density (DB), total porosity (TP), water-holding porosity (WHP), air porosity (AP), WHP/AP, electrical conductivity (EC) and cation exchange capacity (CEC) of mixed substrate based on regression equations of measured values from 76 substrate combinations. These seven models were verified using the measured values of 12 mixed substrates, and the average relative prediction errors (REs) were all less than 10%. A comprehensive property prediction model was established by weighted summation of the seven models of physical and chemical properties. According to the set values of DB, TP, WHP, AP, WHP/AP, EC and CEC, the comprehensive property model predicted the six mixture proportions of mixed-substrate, as verified using the measured values. This study is the first to establish prediction models for the physical and chemical properties of mixed substrates. The comprehensive property model could be used to evaluate the physical and chemical properties of commercial mixed substrates, and to provide the optimal mixture substrate formulations according to the setting property value of production requirement.
Keywords: prediction model, mixed substrate, physical and chemical properties, multiple regressions, genetic algorithm
DOI: 10.25165/j.ijabe.20211402.5815

Citation: Gong B B, Wang N, Zhang T J, Li S, Wu X L, Tian J, et al. Establishment and verification of prediction models for evaluating the physical and chemical properties of soilless substrates. Int J Agric & Biol Eng, 2021; 14(2): 9–18.

Keywords


prediction model, mixed substrate, physical and chemical properties, multiple regressions, genetic algorithm

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References


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