leila saberpour; Saeid Soufizadeh; Abdolmajid Mahdavi Damghani; Jafar Kambouzia; Ghorban Ghorbani Nasrabad
Abstract
Introduction: Cotton is one of the most important fiber plants in Iran which needs more production for national fiber sufficiency goal. Its cropping area in Iran is now about 140,000 ha in which 95.3% is irrigated; rainfed cotton is growing only in Khorasan, Golestan and Mazandaran. Planting date and ...
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Introduction: Cotton is one of the most important fiber plants in Iran which needs more production for national fiber sufficiency goal. Its cropping area in Iran is now about 140,000 ha in which 95.3% is irrigated; rainfed cotton is growing only in Khorasan, Golestan and Mazandaran. Planting date and nutrition management and their interactions are amongst the most important determinants of crop yield.Material and methods: Field experiment in 2016 in the fields of Cotton Research Center of Golestan province in Hashem Abad split plot factorial in a randomized complete block design was conducted. Treatments include the planting date as the main factor, cultivar (Latif and Golestan) and nitrogen (three levels: desirable, a third desirable and without fertilizer) as sub plots. The first planting date in the traits (TDM, LAI, CGR and RGR) was superior to the second planting date. Among the cultivars, Golestan cultivar showed a better response to Latif cultivar at zero fertilizer level and 160 kg ha-1 nitrogen fertilizer.Results and discussion: TDM variation and LAI of cotton cultivars during the growing season were three stages. The first stage, the phase of presentation, in which the TDM variations continued up to 55 and 61 days after planting and the rate of changes in the LAI, respectively, was 55 and 43 days after planting in the first and second planting dates. TDM accumulation changes up to 109 and 96 days, the LAI was about 88 and 96 days, the RGR was 55 and 61 days, and the CGR was 88 and 96 days after planting in the first and second plantings increased linearly. Maximum RGR and CGR were observed at cultivar Golestan cultivar at zero and 160 kg ha-1 in first planting date.Conclusion: In general, first planting date (29 June) in comparison with the second planting date (12 July) caused higher DM production, LAI, RGR and vegetative growth and Golestan cultivar had better performance than Latif cultivar at 0 and 160 khNha-1. The maximum RGR at these two-fertilizer level in Golestan cultivar was recorded at the first planting date which caused a significant difference for the time reaching maximum LAI.
Maryam Akbarpoor; Hadi Veisi; Abdolmajid Mahdavi Damghani; Mohammadreza Nazari
Abstract
Introduction: Localization of the food system has become in line with sustainable agriculture for many reasons including ecological advantages, economic benefits, and social considerations. Yet the question is that to what extent food can be locally produced. To answer this question, the concept of ...
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Introduction: Localization of the food system has become in line with sustainable agriculture for many reasons including ecological advantages, economic benefits, and social considerations. Yet the question is that to what extent food can be locally produced. To answer this question, the concept of foodshed can be considered. The concept provides a framework for analyzing local food production at any scale. The foodshed is a land that can supply all or parts of a given population's nutritional needs within a given geographical area. So far, no foodshed study has been conducted in Iran, so this study proposed a model to study foodsheds. By taking a sustainable food system into account, the current research examined the concept of foodshed, the status of food production and consumption in Tehran Province, and the capacity of this province to meet its nutritional needs. Material and methods: The model was used in Tehran Province using a unit named "plant equivalent" to calculate and compare the amount of food produced in the study area and the nutritional requirement of the province’s population. Production of each crop (based on the plant equivalent unit) in each region was calculated by multiplying the crop cultivation land area in the crop yield. The amount of need for each plant equivalent unit in each region was calculated by multiplying the population of that area in the weight of food that is needed of a person in a year. Then, using self-sufficiency formulas, we estimated how much of the population's needs are being supported by the existing production. To calculate self-sufficiency, a concept known as threshold production was used. Calculation of threshold production was done with Matlab using conditional programming and coding. Excel, Matlab, and GIS were used in this research. Results and discussion: One of the most important achievements of the present study was the foodshed assessment of Tehran Province considering its increasing population and providing food security in this province. In the present study, which was carried out on a provincial scale, self-sufficiency in providing the desired food basket for the population of Tehran Province was 22% and the highest and lowest self-sufficiency was estimated in Pishva and Tehran counties, respectively. Self-sufficiency percent in producing crops to provide the desired food basket in Tehran Province was higher in fodder corn (100%) (self-sufficient), vegetables (79%), fruits (56%), barley straw (53%), wheat straw (45%), barley grain (16%), wheat bran (8%), wheat grain (5%), forage crops except corn (4%), rapeseed meal (0/1%), rapeseed (0/06%), respectively. However, in legumes, rice hull, root, pulp, and molasses of sugar beet, corn, and soybean meal self-sufficiency percent was estimated zero percent, meaning non-self-sufficient or total dependence. Conclusion: The results of this study indicated that the percentage of foodshed self-sufficiency in providing the desired food basket for the population of Tehran Province was 22%. Although localization has benefits, it seems that considering the small area and the overcapacity population of Tehran Province and the environmental issues (water scarcity and soil erosion), the boundaries of Tehran Province foodshed should be broadened and the foodshed radius must be increased.
Mohammad Yousefi; Mahmud khoramivafa; Abdolmajid Mahdavi Damghani; Gholamreza Mohammadi; Ali Beheshti Alagha
Volume 15, Issue 3 , October 2017, , Pages 123-134
Abstract
Introduction:
Greenhouse gas emission and distractive environmental crisis such as global warming and change climate was occurred by human activation in natural ecosystems in this century. Due to this problem carbon sequestration is a win-win approach to purpose reducing of distractive human activation ...
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Introduction:
Greenhouse gas emission and distractive environmental crisis such as global warming and change climate was occurred by human activation in natural ecosystems in this century. Due to this problem carbon sequestration is a win-win approach to purpose reducing of distractive human activation and emission of greenhouse gas. Accordingly, this study was carried out to purpose the assessment of carbon sequestration with economic value by Quercus brantii Lindi forest in Kermanshah province in 2015 to 2016.
Material and methods:
Essential data for this research was collected by on farm method and random sampling method in two groups including coppice and single stem forms in oak forest in Bisetoon protected region. Then, the amount of carbon sequestration and its economic value were calculated by using the collected data and application of mathematical relations in this forests.
Results and discussion:
According to result of this study amount of carbon sequestration by trees biomass was 1622.67kgha-1yer-1 in coppice forms. This amount was 1786.47kgha-1yer-1in single stem. Therefore amount of CO2 captured and saved in wood tissue and organic matter of residual in bottom of tree layer was 5841.61, and 6431.29 kgha-1yer-1 in coppice and single stem forms. Due to the applied tax rate for every ton of carbon emissions, the annual economic value per hectare of this forest was estimated 1780856 rials.
Conclusion:
furthermore, suitable management of oak forest ecosystems in this investigating region and subsequently around the country is very important to purpose of reduces the environmental crisis, such as reducing greenhouse gas emissions and change climate. On the other hand, Due to the importance of carbon credit issue and international issues surrounding it, it has benefited for the resumption and maintenance of these natural ecosystems.
Masoud Ghazvini; Hadi veisi; Abdolmajid Mahdavi-Damghani; Korous Khoshbakht; Mohammad Ali Nejatian
Volume 14, Issue 2 , July 2016, , Pages 13-22
Abstract
As biodiversity declines, the ability of agro-ecosystems to produce ecosystem services such as food security deteriorates. Despite the important role of grape in the livelihood of communities that produce this crop and also its high potential for export, very few studies have been conducted on the status ...
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As biodiversity declines, the ability of agro-ecosystems to produce ecosystem services such as food security deteriorates. Despite the important role of grape in the livelihood of communities that produce this crop and also its high potential for export, very few studies have been conducted on the status of biodiversity in grape production ecosystems and its relationship with different indices of productivity and stability. The data presented here were collected during face-to-face interviews with 220 grape orchardists in 2011. Results showed negative significant correlations between the Shannon-wiener index with total productivity (- 0.175**), water productivity (- 0.19**), land productivity (- 0.173**) and labour productivity (- 0.202**) as well as correlations between species richness with land productivity (- 0.14*). These results indicate negative relationship between changes in biodiversity of grapevine varieties with vineyard’s productivity and imply the long-term sustainability of the vineyards in Takestan County. Regression analysis showed that the explanation coefficients (R2) were between 0.03-0.04. We tentatively conclude from this that a 1% change in BD corresponds to approximately a 0.03-0.04% change in the value of productivity. The results also showed that the varietal diversity of vineyards have no effect on vineyards’ yield stability.
Tayyebeh Zare-Zadeh Mehrizi; Korus Khoshbakht; Abdolmajid Mahdavi Damghani; Jafar Kambouzia
Volume 8, Issue 4 , July 2011
Abstract
Ignorance to the principals of sustainable development has affected mangrove forests due to development projects. In order to study the effects of reduction in tidal flooding on vegetative structure of mangrove forests in Nayband coastal national park, a survey was conducted using linear transect method. ...
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Ignorance to the principals of sustainable development has affected mangrove forests due to development projects. In order to study the effects of reduction in tidal flooding on vegetative structure of mangrove forests in Nayband coastal national park, a survey was conducted using linear transect method. By comparing the structure of mangroves in the Nayband area with Mound protected area the amount of destruction in this area was studied. Linear transact was used to determine the structure of the mangrove forests in this area. 5 Stations were considered. From that four stations were located in Nayband national park and the last one was situated in Mound protected area as control. A quadrate sample plot with 100 m2 in each transect has been used as the measuring unit with random–systematic distribution. In each plot, the height and steed diameter of trees as well as the height and diameter of crowns were measured. Furthermore, 1 m2 micro plots were used to measure the quantity and height of aerial roots as well as number of seedlings. Results showed that the road construction in this protected area resulting in decrease of water streams in some parts which are the main factor for destruction of this worthy ecosystem. Increase of the number of dried trees, reduction of canopy and the number of aerial roots are main evidences to prove these claim. The green density of mangroves was reduced to 60 and 40 % in the stations 1 and 4 respectively. The canopy in these stations was 40 and 52% respectively; that makes a spare canopy of mangroves forests. There was no seedling in station 1. Therefore, more efforts are need to improve the mangrove vegetation in these stations with strengthening of tidal fluctuations.
Hadi Veisi; AbdolMajid Mahdavi Damaghani; Houman Liaghati; Hossein Sabahi
Volume 7, Issue 1 , October 2009
Abstract
This study aims to analyze the reasons for and obstacles to adopting IPM Technologies among rice farmers in Mazandaran and Guilan provinces. 170 farmers that attended a FFS (Farm Field School) groups but did not adopt the IPM Technologies were randomly selected. Data were collected by questionnaire and ...
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This study aims to analyze the reasons for and obstacles to adopting IPM Technologies among rice farmers in Mazandaran and Guilan provinces. 170 farmers that attended a FFS (Farm Field School) groups but did not adopt the IPM Technologies were randomly selected. Data were collected by questionnaire and analyzed by SPSS software. To determine the main causes of non-adoption and underline these, factor analysis was used. Results revealed that the main causes of non-adoption of IPM Technologies were financial reasons, farmers' own personal characteristics, risk and vague spheres, management issues, insufficient information and technological questions. These causes were explained with a 58.8% variation. Finally, based on the results obtained, promoting conflict management by focusing on a problem solving approach and institutional development to eliminate obstacles and to promote adoption was suggested.
Fakhreddin Hashemi Shadegan; Korous Khoshbakht; Abdolmajid Mahdavi Damghani; Hadi Veisi; Houman Liaghati
Volume 6, Issue 4 , July 2009
Abstract
A study was conducted using a modified model to assess the level of threat and effective factors in villages with two ecologies, in Basht County, Gachsaran in Southwest Iran, including a protected area with a dominant mountainous topology and another with a plain-hilly situation. The results showed that ...
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A study was conducted using a modified model to assess the level of threat and effective factors in villages with two ecologies, in Basht County, Gachsaran in Southwest Iran, including a protected area with a dominant mountainous topology and another with a plain-hilly situation. The results showed that level of threat increased with the decreasing distance of villages from the urban region and mountain villages had a lower level of risk than plain-hilly areas. Trends of agrochemical application, weed management techniques and acreage of fields receiving agrochemicals had the highest frequency of flooding and incidental fires and the acreage of agricultural land in the area made the least contribution to the threat of agrobiodiversity erosion. The results of cluster analysis divided villages into two clusters in which all mountainous villages, along with two plain-hilly villages were placed in one cluster and the others were located in the second cluster. Estimating the role of divergence factors in the clusters revealed that five factors including the distance to the main urban centers, distance to industrial developmental projects, ratio of irrigated to rain-fed lands, extent of use of modern varieties and exploitation rate of habitat species had the highest effects on divergence of the biodiversity threat in the model. Results showed that human activities are the main factors in genetic erosion threats, whereas natural factors as well as traditional agricultural and social practices and the availability of agricultural territories in the area resulted in the least risk to biodiversity.
Abdolmajid Mahdavi Damghani; Korous Khotshbakh; Hadi Veisi
Volume 6, Issue 4 , July 2009
Abdolmajid Mahdavi Damghani; Mehdi Nassiri Mahallati; Alireza Koocheki
Volume 2, Issue 6 , January 2005
Abdolmajid Mahdavi Damghani; Alireza Koocheki; Parviz Rezvani Moghaddam
Volume 1, Issue 4 , July 2004
