Effect of Efficiency Improvement on Pollution Caused by Overuse of Chemical Fertilizers of Rice Cultivation in Guilan Province

Subject Areas : Agricultural Economics Research

Seyedeh Sedigheh Ahmadzadeh ¹ , hamid amirnejad ² , seyed ali hosseini yekani ³

1 - گروه اقتصاد کشاورزی، دانشکده مهندسی زراعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران.
2 - Department of Agricultural Economics, Agricultural Engineering College, Sari Branch, Sari Agricultural Sciences and Natural Resources University, Sari, Iran.
3 - Department of Agricultural Economics, Faculty of Agricultural Engineering, Sari Agricultural Sciences and Natural Resources University, Sari, Iran

Received: 2020-02-04 Accepted : 2020-04-17 Published : 2022-07-23

Keywords: Technical efficiency, Directional Distance Function, Profit Efficiency, Rice Farmers of Guilan Province,

Abstract :

Introduction: The purpose of this study is to compare the experimental results obtained from estimating the technical and profit efficiency of rice farmers in Guilan province and determining the effect of efficiency improvement on pollution caused by overuse of chemical fertilizers in 2018-2019. Materials and Methods: For analysis of technical and profit efficiency, the directional distance function has been used. Farms were classified into three groups according to region (east, center and west). Also, the farms were divided into 5 groups based on rice varieties (Hashmi variety, Ali Kazemi variety, Shiroudi variety, Jamshidi variety and Khazar variety). R, GAMS and Excel software were used in this study. Findings: The results showed that improving the technical efficiency lead to the reduction of nutrients surplus discharged into the environment. But, the profit efficiency mostly increases the amounts of nutrients surplus discharged into the environment. Base on results, technical efficiency improvement reduces the amount of nutrients surplus discharged into the environment for Hashemi variety by 3.5 to 38.8 kg/ha, Ali Kazemi variety by 0.4 to 23.3 kg/ha, Jamshidi variety by 7.6 to 42 kg/ha, Khazar variety by 2.9 to 20.7 kg/ha and Shiroudi variety by 18 to 48.6 kg/ha. Conclusion: If the rice farmers of Gilan province become technically efficient, this will lead to the reduction of pollution in all areas.  Considering that the excessive use of chemical fertilizers leads to the discharge of nutrients surplus into the environment, therefore encouraging rice farmers to perform soil test and optimum use of chemical fertilizers can lead to reduced pollution and increased technical efficiency.

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