Amiri, Zahra (2019) Extended exergy, emergy and economic approach as an integrated indicator of sustainability of two canola production systems in Lorestan province, Iran. Doctoral thesis, university of zabol.
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Abstract
In direction of demonstrating suitable strategies for the purpose of cultivation expansion, increasing sustainability and productivity in production systems of canola as a sterategic crop, in agricultural year 2017-2018, were done 2 traditional and commercial systems of canola with usage of thermodynamics techniques of expanded exergy analysis (EEA), in the mold of a new manner in evaluating of agricultural ecosystems, emergy and analysis in Khorram Abad-Iran. With the employed biophysics methods, was demonstrated comprehensive picture from situation of deliberated agricultural systems sustainability in this research. The EEA of these two systems showed that the exergy of the environmental remediation cost (EEE) for the traditional system was less than that of the commercial system by 2.69×104 MJ ha-1. Accordingly, the ecological sustainability of the traditional system was found to be two times higher than the commercial system. In contrast, the values of thermodynamic indicators such as the capital conversion factor of the annual monetary value of product sales ( ), the extended exergy efficiency (ŊEEA), and the cumulative degree of perfection (CDP), respectively, indicate the higher economic value, the higher thermodynamic efficiency and the greater optimality of the commercial system compared to the traditional system. The high consumption of inputs led to increased cumulative exergy consumption (CExC) in the traditional system. also The calculated values of the ESI*, %R, ELR, and ELR* indices showed the higher ecological sustainability of the traditional farming system compared to the commercial system of canola production. According to these indices, the main reason for the lower sustainability of the commercial canola production system was the large amount of soil organic matter that was lost per unit input of nonrenewable resources used. A large emergy exchange ratio in favor of the buyer, the increased environmental sustainability when the market impact is considered, the lower emergy consumption per unit of output and the higher productivity of the production factors all reflect the relative advantage of the commercial system based on the indices of EERY, EISD, UEV and total factor productivity (TFP), respectively. Hence, our findings revealed that in the commercial canola production system, the ecological sustainability can be improved drastically by employing scientific approaches for the comprehensive management of the production ecosystems, especially through the amelioration of soil organic matter and prevention of its loss. Besides improving the farmers’ technical knowledge, the integration of small lots into the production system is recommended for improving the economic sustainability of the traditional production system.
| Item Type: | Thesis (Doctoral) |
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| Uncontrolled Keywords: | Canola production, Thermodynamic indexes, Ecological sustainability, Economic productivity |
| Subjects: | S Agriculture > SB Plant culture |
| Depositing User: | Mrs najmeh khajeh |
| Date Deposited: | 11 Nov 2019 06:29 |
| Last Modified: | 11 Nov 2019 06:29 |
| URI: | http://eprints.uoz.ac.ir/id/eprint/2570 |
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