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Comparison of the Impact of Production Factors on the Ecological and Economic Efficiency of the Potato Land-Use Type in Vietnam and Russia Based on the Cobb-Douglas Production Function

Giang Pham Quy, Huong Vu Thi Thu

Journal of Ecological Engineering

2023

Vol. 24, nr 9

272--281

This study aimed to identify and compare the impact of production factors on the total ecological and economic efficiency of the potato land-use type in the two regions Primorsky Kray, Russia and Red River Delta, Vietnam using the Cobb-Douglas production function. The result of data analysis for the period of 2016–2019 showed that the contribution coefficient of factors such as initial investment, labor cost, expenses of machinery and equipment, and amounts of pesticides and fertilizers used for potato farming per hectare to the total ecological and economic efficiency of the potato land-use type in Primorsky was higher than in the Red River Delta. The results also show that the amounts of pesticides and fertilizers in the Red River Delta were used more than in Primorsky; therefore, they present a higher influence on the total ecological and economic efficiency. On the basis of the analysis of the impact of each factor, this study has proposed the solutions to enhance the influence of the factors that have a proportional effect and minimize the influence of factors that have an inversely proportional effect on the economic-environmental efficiency of potato land use in each study area.

Riverbank Filtration – A Potential Water Source Exploitation for the Red River Delta Region

Nguyen Trung Hieu, Doan Thu Ha, Hoang Van Duy, Tong Thanh Tung

Inżynieria Mineralna

2021

no. 2

53--64

Riverbank filtration technology has been widely applied worldwide because of its high-capacity collection and good water quality throughout natural purification processes. Infiltration water can be extracted from Holocene (qh) layer or the Pleistocene deep layer (qp), replenished with water from the river through hydrogeological windows. Hydrodynamic and isotopic signatures were employed to determine water seepage capacity. The results show that infiltrated water is found in the sand layers along the rivers. However, the seepage rate shows a heterogeneously spatial variation ranging from 30 m3 /d in the Dinh Dao river to 33,600 m3 /d. Km along the shoreline in the Red River (RRD). Also, the exploitation capacity of seepage water differs widely in order of large (> 3,000 m3 /d), medium (1,000-3,000 m3 /d), small (500-1,000 m3 /d), and very small capacity (200-500 m3 /d). This study indicated that RRD could apply riverbank filtration techniques to overcome freshwater scarcity in the delta due to increasing surface pollution and discharge reduction.