scholarly journals Latent vs. Observed Variables: Analysis of Irrigation Water Efficiency Using SEM and SUR

2015 ◽  
Vol 67 (1) ◽  
pp. 173-185 ◽  
Author(s):  
Jianjun Tang ◽  
Henk Folmer
Keyword(s):  
Irrigation Water ◽  
Water Efficiency

scholarly journals Impacts of Off-Farm Employment on Irrigation Water Efficiency in North China

Water ◽  
2016 ◽  
Vol 8 (10) ◽  
pp. 452 ◽  
Author(s):  
Ning Yin ◽  
Qiuqiong Huang ◽  
Zhihai Yang ◽  
Yapeng Wang
Keyword(s):  
Irrigation Water ◽  
North China ◽  
Water Efficiency

Study on the joint probability distribution of irrigation water volume and irrigation water efficiency

2015 ◽  
Vol 15 (4) ◽  
pp. 802-809
Author(s):  
Yong Zhao ◽  
Jinping Zhang ◽  
Weihua Xiao
Keyword(s):  
Probability Distribution ◽  
Conditional Probability ◽  
Irrigation Water ◽  
Joint Probability ◽  
Water Volume ◽  
Joint Probability Distribution ◽  
Water Efficiency ◽  
Copula Method ◽  
Joint Return ◽  
Water Volumes

Using the copula method, the joint probability distribution of irrigation water volume and efficiency is constructed, and their joint return period is also described to reveal the encounter probability of irrigation water volume and efficiency. Furthermore, the conditional probability of irrigation water efficiency with different water volumes is built to show the quantitative effects of flow on irrigation water efficiency. The results show that the copula-based function can present the encounter risk and conditional probability of irrigation water volume and efficiency at their different magnitudes.

scholarly journals Research on Irrigation Water Efficiency of Guizhou Province Based on SFA

2021 ◽  
Author(s):  
Kang Zhang ◽  
Yunduo Zhang ◽  
Jiangli Zheng ◽  
Zhipeng Ma
Keyword(s):  
Technical Efficiency ◽  
Irrigation Water ◽  
Water Saving ◽  
Guizhou Province ◽  
Water Efficiency ◽  
Effective Utilization ◽  
Utilization Coefficient ◽  
The Difference ◽  
Large Water ◽  
New Perspective

The measurement of farmland irrigation water efficiency is an important part of the evaluation of agricultural water saving. Since the method of econometrics research on the relationship between input and output was introduced to the evaluation of irrigation water efficiency, it has provided a new perspective for evaluating irrigation water efficiency. This study takes Guizhou in southwest China as an example, using the SFA method to calculate the technical efficiency of food production and irrigation water from 2011 to 2018, and compares the technical efficiency of irrigation water with the measured irrigation water effective utilization coefficient analysis. The analysis shows that: (1) Guizhou’s multi-year average irrigation water technical efficiency value is 0.730, and the difference between cities is large. 20.8% of the urban irrigation water technical efficiency is lower than the average level, and there is a large water saving potential; (2) The correlation coefficient between the irrigation water technical efficiency calculated by the SFA method and the measured irrigation water effective utilization coefficient is 0.804, which is highly positively correlated, and the simulation calculation validity is 70.6%; (3) The SFA method can provide an effective reference for the study of the change trend of the effective utilization coefficient of farmland irrigation water in the absence of measured data.

scholarly journals Drinking-water efficiency, cost of illness, and peri-urban society: An economic household analysis

PLoS ONE ◽  
2021 ◽  
Vol 16 (9) ◽  
pp. e0257509
Author(s):  
Ghaffar Ali ◽  
Muhammad Khalid Bashir ◽  
Sawaid Abbas ◽  
Mehwish Murtaza
Keyword(s):  
Drinking Water ◽  
Family Size ◽  
Cost Of Illness ◽  
Irrigation Water ◽  
Policy Framework ◽  
Primary Data ◽  
Urban Residents ◽  
Water Efficiency ◽  
Data Set ◽  
The Cost

This study aims to measure the efficacy of drinking water in terms of the economic impacts and risk of illness involved in using perilous water sources. Socio-economic factors were also considered. A multidisciplinary approach was employed to analyze the data, including the cost of illness (COI), regression technique, and irrigation water efficiency methods. The primary data set consisted of 210 peri-urban and urban households. It was found that the average cost of illness was higher in peri-urban ($10.79 USD) areas, while willingness to pay for quality water was higher in urban residents. Social status, income, and family size was positively associated with the cost of illness, while education, the source of drinking water (ground water and others), and awareness about safe drinking were negatively associated with the cost of illness. Furthermore, urban residents were more efficient in terms of conveyance and water use. This is one of the first studies to apply irrigation water efficiency methods to measure drinking water efficiency. The results are timely and important with both practical and social implications, including guiding policy framework. It is suggested that family planning programs be made more effective to control family size. The filtration plants to enhance drinking water quality be installed in the central places of each town/division/union council. A public-private partnership could work to provide affordable quality drinking water.

scholarly journals Assessment of Irrigation Practices of Farmers Receiving Water from Open-Canal and Piped Irrigation Networks

2017 ◽  
Vol 5 (9) ◽  
pp. 1066
Author(s):  
Nihan Körpe Aslan ◽  
Murat Tekiner
Keyword(s):  
Irrigation Water ◽  
Growing Season ◽  
Water Efficiency ◽  
Canal Irrigation ◽  
Irrigation Networks ◽  
Farmer Practices ◽  
Canal Network ◽  
Receiving Water ◽  
Tomato Culture ◽  
Irrigation Practices

Open-canal irrigation networks have been transformed into closed-piped networks. Drip irrigation is the most common method used irrigations in Çanakkale province. The aim of study is to assess irrigation practices of farmers using different irrigation networks. There were not significant differences in irrigation practices of the farmers receiving water from both networks, but all were making mistakes and unconscious in their practices. An optimum schedule was also prepared to compare with farmer practices. While a farmer growing tomato in Kumkale village with piped-network was expected to apply 531 mm irrigation water as seasonal total, present farmer applied 1414 mm water; while a farmer growing tomato in Mahmudiye village with open-canal network was expected to apply a total of 457 mm, present farmer applied 492 mm irrigation water; while a farmer growing maize in Kumkale village with piped-network was expected to apply 512 mm, the present farmer applied 975 mm; finally a farmer growing maize in Mahmudiye village with open-canal network was expected to apply 379 mm water, the present farmer applied 228 mm irrigation water throughout the entire growing season. Irrigation water efficiency (IWUE) values indicating the effects of irrigation water quantities on yields were calculated as 2.5 kg/da/mm for tomato culture in Kumkale; 12.3 kg/da/mm for tomato culture in Mahmudiye; 0.7 kg/da/mm for maize culture in Kumkale and 8,7 kg/da/mm for maize culture in Mahmudiye village. Relative irrigation supply (RIS) values indicating how efficiently the precipitations were used were calculated as 2.98 for tomato culture in Kumkale; 1.41 for tomato culture in Mahmudiye; 2.40 for maize culture in Kumkale and 0.85 for maize culture in Mahmudiye village.

Application of a monitoring and evaluation method in irrigation water efficiency*

2020 ◽  
Vol 69 (S2) ◽  
pp. 161-170
Author(s):  
Feng Baoqing ◽  
Cui Jing ◽  
Wu Qianming ◽  
Han Zhenzhong
Keyword(s):  
Irrigation Water ◽  
Evaluation Method ◽  
Monitoring And Evaluation ◽  
Water Efficiency

scholarly journals Drip pulses and soil mulching effect on american crisphead lettuce yield

2015 ◽  
Vol 35 (6) ◽  
pp. 1009-1018 ◽  
Author(s):  
Willian F. de Almeida ◽  
Luiz A. Lima ◽  
Geraldo M. Pereira
Keyword(s):  
Experimental Design ◽  
Irrigation Water ◽  
Crop Yields ◽  
Irrigation Management ◽  
Water Efficiency ◽  
Crop Evapotranspiration ◽  
Plastic Mulching ◽  
Black Plastic ◽  
Lettuce Yield ◽  
Water Depths

ABSTRACT An experiment was conducted in a greenhouse at the Federal University of Lavras cultivated with American lettuce, cv. Raider-Plus. The aim of this study was to evaluate the effects of irrigation water depths applied by drip pulses and of soil coverage on crop yields and efficiency of water use. The experimental design used was randomized blocks with eight treatments and three replications, totaling twenty-four plots. The treatments consisted of soil with and without coverage (double-sided white and black plastic) associated with four irrigation management levels. Irrigation management consisted in reposition of irrigation depths based on crop evapotranspiration (ETc) with D1-100% of ETc, applied continuously (control), and D2 - 100% of ETc, D3 - 75% of ETc, and D4-50% of ETc, applied by pulses. Irrigation by pulses consisted in splitting the depths into six irrigation pulses with intervals of fifty minutes of rest. It was observed that pulse irrigation saved 25% of water in treatment without mulching and 50% when plastic mulching was used, contributing substantially to improve irrigation water efficiency.

Application of Extenics in Evaluation of Utilization Degree of Irrigation Water

2013 ◽  
Vol 864-867 ◽  
pp. 2112-2115
Author(s):  
Ai Wu Cao ◽  
Feng Zhu ◽  
Yu Wei Liu ◽  
Yang Qian
Keyword(s):  
Irrigation Water ◽  
Comprehensive Evaluation ◽  
Water Efficiency ◽  
Agricultural Water ◽  
Traditional Methods ◽  
Water Utilization ◽  
Key Indicator ◽  
Irrigated Area ◽  
Static Water ◽  
Water Measurement

The utilization degree of irrigation water is the key indicator of agricultural water-saving efficiency. Currently, water efficiency of irrigation is used to reflect the utilization degree of irrigation water, people commonly uses hydrodynamic measurement and static water measurement, but the result is still affected by many factors. This thesis is based on the method of extenics that combines with various kinds of irrigated area characteristics, realizes the comprehensive evaluation of irrigation and irrigation water utilization. And a simple example shows that is more reasonable compared with traditional methods.

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