Determination of Net Water Requirement of Crops and Gardens in Order to Optimize the Management of Water Demand in Agricultural Sector

2020 ◽  
pp. 331-360
Author(s):  
Hamidreza Salemi ◽  
Norair Toomanian ◽  
Amirhooshang Jalali ◽  
Alireza Nikouei ◽  
Morteza Khodagholi ◽  
...  
Keyword(s):  
Water Demand ◽  
Agricultural Sector ◽  
Water Requirement

Analysis of greenhouse gas emissions from 10 biogas plants within the agricultural sector

2013 ◽  
Vol 67 (6) ◽  
pp. 1370-1379 ◽  
Author(s):  
J. Liebetrau ◽  
T. Reinelt ◽  
J. Clemens ◽  
C. Hafermann ◽  
J. Friehe ◽  
...  
Keyword(s):  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Agricultural Sector ◽  
Nitrous Oxide Emissions ◽  
Life Cycle Assessments ◽  
Gas Emissions ◽  
Biogas Plants ◽  
Reduce Emissions ◽  
Generation Unit

With the increasing number of biogas plants in Germany the necessity for an exact determination of the actual effect on the greenhouse gas emissions related to the energy production gains importance. Hitherto the life cycle assessments have been based on estimations of emissions of biogas plants. The lack of actual emission evaluations has been addressed within a project from which the selected results are presented here. The data presented here have been obtained during a survey in which 10 biogas plants were analysed within two measurement periods each. As the major methane emission sources the open storage of digestates ranging from 0.22 to 11.2% of the methane utilized and the exhaust of the co-generation units ranging from 0.40 to 3.28% have been identified. Relevant ammonia emissions have been detected from the open digestate storage. The main source of nitrous oxide emissions was the co-generation unit. Regarding the potential of measures to reduce emissions it is highly recommended to focus on the digestate storage and the exhaust of the co-generation.

Future Climatic Patterns and Sustainability of Current Cropping Patterns in a Water-Scarce River Basin of Eastern India 

2021 ◽  
Author(s):  
Smaranika Mahapatra ◽  
Madan Kumar Jha
Keyword(s):  
Water Demand ◽  
Agricultural Sector ◽  
Monsoon Rainfall ◽  
Baseline Period ◽  
Eastern India ◽  
Crop Water ◽  
Cropping Patterns ◽  
Water Demands ◽  
Crop Water Demand ◽  
Water Scarce

<p>Agricultural sector, being the largest consumer of water is greatly affected by climatic variability and disasters. Most parts of the world already face an enormous challenge in meeting competitive and conflicting multi-sector water demands. Climate change has further exacerbated this challenge by putting the sustainability of current cropping patterns and irrigation practices in question. For ensuring climate-resilient food production, it is crucial to examine the patterns of the projected climate and potential impacts on the agricultural sector at a basin scale. Hence, this study was carried out for an already water-scarce basin, Rushikulya River basin (RRB), located in the coastal region of eastern India. The bias-corrected NorESM2-MM general circulation model of Coupled Model Intercomparison Project-6 (CMIP6) was used in this study under four shared socioeconomic pathway (SSPs) scenarios, namely SSP126, SSP245, SSP370 and SSP585. The projected climatic parameters and crop water demands of the basin were analyzed assuming existing cropping pattern in the future. Analysis of the results reveals a significant and rapid increase in the temperature at a rate of 0.02-0.5ºC/year during 2026-2100 under all SSPs except SSP126, whereas the rainfall is expected to increase slightly during 2026-2100 as compared to the baseline period (1990-2016), especially in the far future (2076-2100) under all the SSPs. In contrast, monsoon rainfall is predicted to decrease under SSP245 and SSP370, while a slight increase in the monsoon rainfall is evident under SSP126 and SSP585. Although the rainy days will decrease slightly in the future 25-year time window, the number of heavy rainfall events is predicted to increase by two to three times. Also, retrospective analysis of rainfall and evapotranspiration suggested an existence of rainfall deficit (rainfall-evapotranspiration) in the basin throughout the year, except during July to September. The rainfall deficit in the basin during 2026-2100 is found to remain more or less same in the non-monsoon season, except for the month of October under SSP245, SSP370 and SSP585 scenarios where deficit increases by two folds. Rainfall is expected to be in surplus by 4 to 5 times higher under all SSPs except for SSP245. As to the evapotranspiration, an insignificant increasing trend is observed under future climatic condition with only 2 to 4% rise in the crop water demand compared to the baseline period. As the basin is already water stressed during most months in a year under baseline and future climatic conditions, continuing the current practice of monsoon paddy dominant cultivation in the basin will further aggravate this situation. The results of this study will be helpful in formulating sustainable irrigation plans and adaptation measures to address climate-induced water stress in the basin.</p><p><strong>Keywords:</strong> Climate change; CMIP6; SSP; Monsoon rainfall; Temperature; Crop water demand.</p>

A New Way of Understanding Rebound Phenomenon in Agriculture Water Demand Using A Global Sensitivity Analysis Approach

2020 ◽  
Author(s):  
Mohammad Ghoreishi ◽  
Razi Sheikholeslami ◽  
Saman Razavi ◽  
Amin Elshorbagy
Keyword(s):  
Water Resources ◽  
Water Demand ◽  
Agricultural Sector ◽  
Economic Factors ◽  
Net Income ◽  
Upward Trend ◽  
Irrigation Systems ◽  
Total Contribution ◽  
Global Sensitivity ◽  
Rebound Phenomenon

<p>Effective use of water resources has been identified as a means to improve resilience to drought, particularly in the agricultural sector. In recent decades, the idea of shifting to more efficient irrigation systems (e.g., sprinkler irrigation systems) has received increasing attention to reduce the amount of water loss by traditional irrigation systems (e.g., flood irrigation systems), requiring considerable capital investments. However, there are indications that such investments do not lead to a reduction in water use in the long-run, which may even increase paradoxically; a phenomenon known as the rebound phenomenon or Jevon’s paradox. One of the fundamental information gaps concerns an explicit evaluation of coevolutionary dynamics and the interactions among socio-economic factors in the rebound phenomenon in agriculture, which calls for the application of systems-based methodologies such as global sensitivity (GSA) analysis methods to look at time-dynamical aspects of the coevolutionary dynamics between various factors influencing rebound phenomenon. In this study, we use a previously calibrated and validated Agent-Based Agricultural Water Demand (ABAD) model applied to the Bow River Basin in Alberta, Canada - home  to extensive irrigated farmlands with a history of drought experience. We perform a time dependent variance-based GSA on the ABAD model to examine the direct impact of factors as well as their joint influence due to interactions on rebound phenomenon. The overall findings show that the economic factors are the most important elements, which has an upward trend in the simulation time, in the rebound phenomenon. This finding is supported by the local observation as the net income of irrigated land has an upward trend in this time period. In addition, although the individual effect of the factor representing the social interaction among farmers is less important compared to the irrigation expansion factor, its total-order effect (i.e., the total contribution of a single factor including interactions with all other factors) becomes more important indicating the significant interactions among model factors. This analysis provides a deeper understanding of the coevolutionary dynamics of the rebound phenomenon and paves the way for better management of water resources.</p>

scholarly journals Determination of the Achievement of Self Sufficiency Rice in Meeting the Availability of Nation Rice

2020 ◽  
Author(s):  
Lendi Ageng Kurnia ◽  
Deden Dinar Iskandar
Keyword(s):  
Agricultural Sector ◽  
Rice Production ◽  
Positive Trend ◽  
Local Production ◽  
Rice Productivity ◽  
Self Sufficiency ◽  
The Future ◽  
Rice Consumption ◽  
Rice Prices

The priority of the Nawacita Program in the agricultural sector is to increase superior production, especially rice. In achieving these objectives, it is necessary to ensure the availability of national rice. The availability of national rice is fulfilled from 3 aspects, namely local rice production, government rice reserves and rice imports. Most of the previous research, the availability of rice only accounted for local rice production and rice imports. In this study, the government’s rice reserves are counted as one of the main indicators. Because local rice production used to meet people’s needs is always reduced in volume to meet the government’s rice reserves. In achieving rice self-sufficiency, this study also observed how the ability of local rice production to be the only one to supply the availability of national rice, without bringing in from outside parties. Research using the LS method with the Minitab 15.1 program shows the results that partially the availability of national rice is positively influenced by indicators, namely local rice production, rice imports, and the government’s rice reserves. Forecasting the ability of self-sufficiency in rice by relying on local production in supplying the availability of national rice in the future, shows a positive trend meaning the value of the trend of forecasting increases with increasing time. The factors that influence the achievement of rice self-sufficiency are partially determined by rice supply, rice productivity, the gap in rice prices to grain prices, and the use of balanced fertilizers. But it is not influenced by the level of rice consumption in the community. The result of this study indicates that the availability of national rice is still very dependent on local and foreign rice products. However, to achieve rice self-sufficiency in the future, where all needs are met from local products is not impossible, so that dependence on imported rice can be reduced. Keywords: availability of rice, self-sufficiency in rice, production

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