جستجوی مقالات مرتبط با کلیدواژه "ارزیابی اقتصادی" در نشریات گروه "منابع طبیعی"

Despite the high marketability of Mazafati variety, due to the high costs of production, maintenance and transportation, in recent years, with the approach of developing dry and semi-dry varieties, the cultivated area of Piyarom and Medjool varieties has increased in Kerman province. For this purpose, an experiment was conducted in the form of a randomized complete block design with three treatments (Mazafati, Piyarom and Medjool) in 4 replications with a total of 24 date trees (Phoenix dactylifera L.) 15-year-old for two years (1401-1402) in a well-managed garden in Andohjard and three commercial date cultivars of the region were investigated in terms of performance and the performance of these cultivars was also compared with their origins according to library studies. Also, the studied varieties were compared and evaluated economically. The results of the study using the partial budgeting method showed that Medjool variety is the most suitable option for investment in the studied area and similar climatic conditions. After that, there is the Piyarom variety and then the Mazafati variety. Therefore, the cultivation of dry and semi-dry cultivars in the region is suggested.

This study was conducted with the aim of assessment of the economic impact of date palm leaf yellowing and drying out (DPLYD) on the yield of different date palm cultivars. The statistical population of the study includes all orchards in the three regions of Ahwaz, Abadan and Shadegan from Khuzestan province. The data was collected using questionaires and face-to-face interviews with date growers. In this study, three groves in each region that had five dominant cultivars of the region were selected and ten palm trees (replicates) of each variety were taken randomly and the amount of gross income, the apparent percentage of damage, the age of the palms, the amount of contamination with other pests and diseases, and the number of fertilization and irrigation times were recorded. MATLAB® 2020 was used to extract the models using Monte Carlo simulation method, and Eviews® was used to explore the regression model of each cultivar-place order. In overall the results showed that the economic impact of DPLYD on the studied cultivars was usually insignificant. Also compared to other factors affecting the income index, due to the small contribution of DPLYD in the economic loss in Saamrun and Gantar cultivars in Ahwaz, Barhee in Abadan and Gantar and Breim in Shadgan, control and control costs could be allocated for more sensitive cultivars. The difference in the coefficients of the effect of DPLYD on the income index also has revealed the differences in cultivar’s response to the disorder in different places. This can reciprocally affects the control policies of this disorder.

The purpose of this research was economic evaluation of green houses and the factors that affect their profitability in the Varamin plain. The type of this research is descriptive-correlation research that was conducted by using a survey method. The statistical population of the research consisted of the beneficiary farmers of established and cultivated green houses in the Varamin plain. The sample size was 108 farmers. The sampling method was simple random sampling method. The main tool of this research study is a questionnaire that whose validity was verified by using a panel of experts and professors in the field of agriculture. The reliability of the questionnaire was assessed through a pre-test for which the Cronbach alpha was between 0.78 and 0.85 which is considered to be acceptable. The results of this research study show that the mean of the profitability index of cost benefit was 2.286 and thus there is a significant positive correlation between agricultural experience, the level of famer education, agricultural income, the total area of the green house, technical knowledge, using of information resources with the cost benefit profitability index. The results of regression analysis also indicated that the five variables of agricultural experience, agricultural income, the total area of the green house, technical knowledge, using of information resources well explain for 51.5 % of the changes in the cost benefit profitability index of the green houses located in the Varamin plain. Finally, it is recommended to improve the cost benefit profitability index by actions such as increasing the level of technical knowledge and farmer's access to and use of information resources.

Tooba scheme is one of project upon which national, public and personal fertile lands has been allocated to develop farming and garden products in order to optimize utilization of massive capital of country's soils and waters, increase production, create jobs and increase revenue. Therefore, this study has been done with the aim to investigate the economic, social and environmental effects of Tooba scheme in Chaharmahal and Bakhtiari Province. In order to achieve the objectives of this study, data was collected from a sample including 141 Jihad-e-agricultural experts and garden beneficiaries in Chaharmahal and Bakhtiari Province through random sampling method. A questionnaire was used to collect the data. Data analysis was performed by using SPSS20 software. The results based on descriptive analysis showed that the majority of beneficiaries were not satisfied with transfer manner of Tooba scheme. Also, the result based on inferential analysis showed that Tooba schem has improved environmental conditions. In addition to there is a significant differences view between Jihad-e-Agriculture experts and beneficiaries who have not participating in Tooba schem with Tooba schem beneficiaries about the improvement of economic conditions. Also investigation the social conflict effects indicated that there is a significant difference between beneficiaries who have not used Tooba scheme with Jihad-eAgriculture experts and beneficiaries of Tooba scheme.

Attaching a side-mounted furrower diggers makes it possible to use a rear-mounted machines for digging onion bulbs in broadcast planted farms, avoiding wheeling damages. For this purpose, two types of onion diggers, with and without sifting mechanism have been developed. To compare these machines from technical and economical point of view, an experiment was conducted based on randomized complete block design in Faridan region of Isfahan province, Iran. Results showed that the rod type digger due to inconsistent working depth causes the product weight loss of 2.32%, which is non economical. The product weight losses were 0.15% and 0.16% in blade type digger and sieve chain type digger, respectively, which are negligible compared to that of rod digger. The required labour force for collecting the crop dug by blade type digger was 15% higher than that of chain type digger. The higher labour force in this machine was due to more time and accuracy needed for collecting of bulbs. The 15% saving in labour cost in chain type digger obtained in exchange with a higher purchase price which was three fold compared to that of blade type digger. The economical breakeven points for chain type digger and blade type digger were 5.27 and 1.76 hectares, respectively. In general, the chain type digger proved to be more recommendable for larger farms if high power tractors were available. However, the blade type digger with lower price, simple structure and lower maintenance cost can be a more appropriate option for small farm holders.

According to TAVANIR company`s statistics، despite fulfilling the electricity supply plans to the villages with more than 20 families in rural areas of Iran، Still، more than 17،000 rural families in villages، with populations less than 20 families، are deprived from accessing to the electricity. Production Losses، transmission and distribution of electricity and the distribution of the population cause use of solar energy in remote areas. Hence، photovoltaic systems، because of direct conversion of solar energy into electricity without the need for sophisticated equipment are important. In this paper، an economic evaluation of Off Grid photovoltaic systems against national power grid has been studied in Tehran villages، due to the uncertainty in modeling; Monte Carlo simulation with 2000 iterations was used. We did Economic evaluation، using the life cycle cost of a photovoltaic system for a period of 25 to 30 years as well as the development costs for the power grid to remote villages. The paper shows the minimum distance of the village distribution network that the photovoltaic system is more economical than the national power grid development. This distance has inverse relation with discount rate as well as direct relation with the number of cloudy days and the number of rural families.