Showing 5 results for nadi
S Yazdanpanah, P Arjmand, H Porazarang, M Mohanadi Jafari,
Volume 13, Issue 47 (4-2009)
Abstract
Antioxidant activity of pomegranate (Punica granatum) peel extract (PPE), extracted by either methanol or ethanol solvent, was studied by phosphomolybdenum method. Antioxidant activity of methanolic PPE was higher than the other. To evaluate heat stability of PPE in sunflower oil, the rancidity rate of the oil was compared at 90, 120, and 150ºC with those containing α-tocopherol and synthetic BHT, using rancimat method. A sample including 1000 ppm PPE had the highest induction period at 90,120 ,150ºC. The use of PPE had no adverse effect on sensory characteristics of potato chips as judged by the taste panel.
H. Nadian,
Volume 15, Issue 57 (fall 2011)
Abstract
Effect of drought stress and mycorrhizal symbiosis on growth and phosphorus (P) uptake by two sorghum cultivars different in root morphology was studied in a pot experiment. A factorial experiment with a randomized complete block design was performed. In this study, sorghum speed feed cultivar with high root proliferation and branching and sorghum KFS2 cultivar with low root proliferation and branching were colonized by Glomus intraradices. All plants were watered equally in the first three weeks to establish them. Drought stress was applied from the week four and the plants were watered when 40% (T1), 60% (T2) and 80% (T3) of the available water was consumed. Results showed that in both sorghum cultivars, plant dry weight decreased as drought stress was increased. However, dry weight of mycorrhizal plants was higher than that of non-mycorrhizal plants at all levels of drought stress. This increase for speed feed cultivar was greater than for KFS2 cultivar. Phosphorus concentration and total P uptake in shoot of both mycorrhizal plants were greater than those of non-mycorrhizal plants. P accumulation in both cultivars decreased by increasing drought stress due to the decline in plant biomass. However, P accumulation per unit length of colonized root increased by increasing drought stress. The greater percentage of root colonization and the increased total length of external hyphae per unit length of colonized root of KFS2 cultivar led to an increase in mycorrhizal growth response and improved P nutrition of KFS2 cultivar compared to those of speed feed cultivar.
S. Jafari, H. Nadian,
Volume 18, Issue 69 (fall 2014)
Abstract
The aim of this study was to evaluate soil properties changes in a soil toposequence series in Khuzestan province. Twelve soil profiles were dug in north to south direction in this province, according to the changes of the slope in Karoon’s alluvial deposits. The results showed that soil texture regularly changes to heavier form from north to south. It was slightly of redoxomorphic features in low land. Therefore, salic horizon was formed in this land. Despite high water table in this area, gray or mottle forms were few due to high soil salinity. The carbonates were eluviated from surface to subsurface horizon therefore, calsic horizon was formed due to illuviation. Secondary carbonate accumulation was maximum in the studied area. Both classic horizon and cambic horizon were formed in some pedons under long time cultivation in north regions. These developments were originated from organisms that grew under good drainage class. The smectite was seen in the south part of region. It may have been transported by river and deposited under high salinity and flocculated in contact to Persian Gulf’s saline water. The palygorskite was not seen in all patterns. This clay was removed in pedons under long time cultivation in the north area due to more leaching. High irrigation water can accelerate palygorskite transformation. Also, the XRD patterns showed that chlorite, illite, kaolinite and quartz were main clay minerals in the studied soils.
M. Nadi, A. Golchin, E. Sedaghati, S. Shafie, S. J. Hosseini Fard, G. Füleky,
Volume 21, Issue 1 (Spring 2017)
Abstract
Soil organic matter is the largest source of organic carbon in the soil surface which played an enormous role in restoring balance, environmental sustainability, soil elements and climatic conditions. Organic materials influence physical, chemical and biological properties of soil and thus soil fertility directly and indirectly. The amount, type and composition of organic matter are different in different soil and climatic conditions. Different soil components can hold different combination of soil organic matter. In this study soil samples were collected from virgin, Populus and Alnus forests from Guilan Province, Iran. The amount of organic matter in the original samples and sand, silt and clay fractions were measured and the quality of organic carbon (13C) and hydrogen (1H) were determined in fractions by Nuclear Magnetic Resonance. Based on the results the amount of organic carbon in the original samples of Alnus forest was highest. among fractions, clay had the highest amount of organic carbon. The result of Nuclear Magnetic Resonance showed presence of different aliphatic and aromatic carbons and hydrogen in different samples. Virgin forest had the highest proportion of alkyl to oxygenated alkyl carbon ratio and Alnus forest showed the highest ratio of aliphatic to aromatic carbon,. Both mentioned ratios was higher in clay fraction than other two fractions.
R. Mostafazadeh, Sh. Mirzaei, P. Nadiri,
Volume 21, Issue 4 (Winter 2018)
Abstract
The SCS-CN developed by the USDA Soil Conservation Service is a widely used technique for estimation of direct runoff from rainfall events. The watershed CN represents the hydrological response of watershed as an indicator of watershed potential runoff generation. The aim of this research is determining the CN from recorded rainfall-runoff events in different seasons and analyzing its relationship with rainfall components in the Jafarabad Watershed, Golestan Province. The CN values of 43 simultaneous storm events were determined using SCS-CN model and the available storm events of each season have been separated and the significant differences of CN values were analyzed using ANOVA method. The Triple Diagram Models provided by Surfer software were used to analyze the relationships of CNs and rainfall components. Results showed that the mean values of CN were 60 for summer and winter seasons and the CN values in the spring and autumn seasons were 50 and 65, respectively. The inter-relationships of CN amounts and rainfall characteristic showed that the high values of CNs were related to high rainfall intensities (>10 mm/hr) and rain-storms with total rainfall more than 40 mm. Also the CN values were about >70 for the storm events with 40-80% runoff coefficient values.
