جستجوی مقالات مرتبط با کلیدواژه "tehran" در نشریات گروه "اقتصاد کشاورزی"

in the present study, the integration of comprehensive Hydrological -economic modeling system of agriculture and water resources in Tehran province was investigated, in order to assess the potential effects of global warming. To achieve this goal, first using General Circulation Models (GCM) the effects of greenhouse gases on the average climatic variables of temperature and precipitation under the emission scenarios A1B, A2 and B1 were investigated. This was done with the help of GCM/RCM data system and LARS-WG microscale model. Then, using econometric approach and regression analysis, the effects of climatic variables of temperature and precipitation on the average yield of selected products were evaluated. A Positive Mathematical Programming (PMP) model was used to investigate changes in products yields on cropping patterns. The results showed that the behavior of climatic variables of temperature and precipitation during the future periods in the study basins of Tehran province compared to the base period will increase (0/26 to 3/75 °c) and decrease (0/78 to 41/1 mm) respectively.

Vegetables are an important part of the food basket of Iranian households. The purpose of this study is to analyze the market power and identify the behavior of supply chain actors in selected vegetable products. For this purpose, the weekly data of selected vegetable products in Tehran in the period 1390-95 were analyzed. The experimental findings of the study include two main results. First, there is competition between the two levels of wholesale and retail, and the market power of wholesalers in the distribution chain of perishable products such as vegetables is greater than that of retailers. Second, the structure of the vegetable market is different and the reaction of supply chain actors to price changes in each loop is not the same in all products. Therefore, it is suggested that in leading policies, the market power of wholesalers in the vegetable distribution chain, as well as the differences in market structure and the role of each of the chain actors and the type of their reaction to changes in each product, should be considered.

in the present study evaluation of the effects of greenhouse gas emissions on the yield and cropping pattern of selected products in Tehran province were investigated. In order to assess the potential effects of drought, global warming and the establishment of local or regional water markets. To achieve this goal, first using general circulation models (GCM) the effects of greenhouse gases on the average climatic variables of temperature and precipitation under the emission scenarios A1B, A2 and B1 were investigated. This was done with the help of GCM/RCM data system and LARS-WG microscale model. Then, using econometric approach and regression analysis, the effects of climatic variables of temperature and precipitation on the average yield of selected products were evaluated. A positive mathematical programming (PMP) model to investigate changes of products yields on cropping patterns was used. The results showed that the behavior of climatic variables of temperature and precipitation during the future periods in Tehran province compared to the base period will increase (0/27 to 3/75 °c) and decrease (0/63 to 41/1 mm) respectively. Increasing the farmers’ desire to develop the acreage of irrigated wheat, corn and canola and reducing the acreage of irrigated barley, tomato, watermelon and sunflower in the cropping patterns of of Tehran province is an important result of application of integrated climate scenario (2 °c increase in temperature and 20 mm decrease in precipitation) in this study. Under the terms of climate change occurrence, watermelon and sunflower with the most decreasing changes in yield (13/1 and 17/7 %) and acreage (68/8 and 31/9 %) as the most sensitive products in cropping pattern of Tehran province were identified. Therefore, planning to reduce or develop the their acrage in the cropping pattern of Tehran province is recommended to farmers and relevant officials in the agricultural sector during future periods.

Nowadays, the issue of providing food security of vulnerable groups is one of the ‎formidable challenges at the international level. Refugees as one of these vulnerable ‎groups are always considered by governments and improving the situation of their food ‎security is substantial in many developed and developing countries. In this study, the ‎situation of food security of Afghan refugees was assessed in Southern areas in Tehran ‎province, 2018-2019. The needed data was collected via filling out the HFIAS questionnaire and ‎the questions related to socio-economic factors. The results showed that 88.7% of ‎Afghan refugee households face food insecurity in the target areas and prevailing ‎moderate food insecurity is more than mild and severe level (40.7%). The age of headed-‎household, heads' occupation (permanent or seasonal job), income groups (medium and ‎high level of income), the number of employed members, and personal saving are ‎inversely and significantly associated with food insecurity. On the other hand, having a ‎child greater than 18 years old, the number of male children, and head's smoking have ‎a direct and significant association with food insecurity among Afghan refugee ‎household. Therefore, attending to socio-economic factors which were confirmed their ‎significant association with food insecurity in this study is important. Developing ‎employment opportunities, making easier access to banking facilities, the needed ‎education in the line of reducing the consumption of cigarette and decreasing the limited ‎access to the job market are suggestable.

The aim of this study is identification of effective qualitative factors on the price of edible mushrooms using Logit model. Therefore, data were gathered by interview and questionnaire completion from 148 households of district six of Tehran municipality. The results showed that some variables including whiteness of mushrooms, package, stem size, and mushroom type are positively influencing the mushroom price, while thickness and rot of mushroom are negatively and significantly influencing the price of mushroom. According to the results, making manufacturing units near consumption market, using proper marketing instruments, including packaging and tendency to produce button mushroom were recommended to the practitioners of this field.

Squares and markets of a day, as a supply centre for daily needs of citizen, are components of network services in the city of Tehran. Their transmittal, appropriate structure and utilizing diversity, for consideration of social, economic, cultural and environment, are very important; that it should be considered in city management. In this study with the use of scientific methods, comments professinals, experiments experts and analytical hierarchy model, positioning indices are priorized in the city of Tehran.
Results showed that, 6 main indices are collected: 1-Land ownership 2- Land area 3- Parking lot 4- Accesibility 5- Compatibility and proximity and 6- hierarchy and centralization. Azadi square with obtaining 0.961 score, has the highest rating between 186 positions. After that Sadeghieh and Jalal-al-ahmad squares are with 0.913 score. Markets of a day (Vali-asr and Atlas), with 0.091 score, are worst in comparison with others. The results implied that, most of the current problems in squares and markets are low area of lands, scarcity of parking lot and accessibility respectively.

The purpose followed in this descriptive correlational research was to investigate factors influencing the adoption of risk management in industrial dairy farmers in Tehran Province. Population of the study included industrial dairy farmers in commercial animal husbandries in Tehran Province (N=320). A cluster sampling technique was employed to select the sample in the study (n=175). Data was gathered through questionnaire. Validity of the instrument was established by the help of a panel of experts. A reliability analysis was conducted in which Cronbach''s Alpha coefficient was recorded from 0. 78 to 0. 94. Findings of the study indicated that a majority (49%) of the industrial dairy farmers’ risk management was considered to be at a «moderate» level. The results showed the main methods for risk management among industrial dairy farmers to include: consultation with experts and specialists، as well as employment of veterinary help. There was a statistical significant positive relationship observed between distance from the help husbandry farm and the manager''s site of residence، the awareness of risk factors، size of capital، annual income، number of livestock، and the level of use of informational channels vs. the level of risk management among the farmers. The results of the multivariate regression revealed that 50. 90 percent of variability in risk management stems from: size of capital، annual income، and the degree of awareness regarding risk factors.