introduction nowadays because of various economic problems in rural areas it is necessary to pay attention to new economic activities such as tourism, in order to overcome economic challenges as well as achieving sustainable development goals. estimating tourist's willingness to pay and analyzing the affecting factors on it, along with the economical and social demands of people could dema...

background and objectives: over the last two decades, a large number of researches have been conducted regarding the importance of nitrogen in sugar beet. this indicate that there were needs to investigate more on nitrogen management to achive higher production and quality because less nitrogen application result in reducing yield and high nitrogen application would increase production costs an...

selenium is an essential trace mineral and has a profound impact on immune function, health and productive performance. an experiment was conducted to evaluate the effects of dietary selenium in different levels on performance and humoral immunity in broiler chicks. male broiler chicks (arbor acres, 1-d old, n= 225) were randomly assigned to 3 treatment groups of 5 replicates each including 15 ...

this research was conducted at the agricultural college of tehran university in 2005 to analyze the effect of use of cytokinin as well as of calcium on durability of rose (illona cultivar). cuttings were taken from rose biennial mother plants, then treated by cytokinin of 0, 0.1, 1and10 micromole per liter and calcium of 0,10,20 and 30 milimole per liter. cut flowers, after harvest, were kept i...

introduction cultural or heritage tourism is a tool of economic development that leads to economic growth by attracting visitors from outside the host community through historic and heritage attractions of destinations. this is a human heritage as cultural traditions of each society and is considered as cultural tourist attractions. hence, yazd is an ancient city with archaic culture and also r...

introduction groundwater resources in arid-semiarid zones universally suffer from problems of over-abstraction and declining water tables. in addition to the issues related to quantity, degradation of groundwater quality now assumes major importance in the arid and semiarid regions. in such areas, natural factors such as the low precipitation, combined with high evapotranspiration, result in hi...

the behavior of suspended sediment during flood events is not only a function of energy conditions, i.e. sediment is stored at low flow and transported under high flow conditions, but also is related to the variations in sediment supply and sediment depletion. these changes in sediment availability result in so-called hysteresis effects. therefore, hysteresis pattern analysis is of great import...

boron toxicity is becoming more extensively widespread in arid and semi arid regions, due to the application of either saline waters or irrigation waters containing a relatively high b content. results of research indicate that addition of certain plant nutrients such as n may reduce the harmful effect of high b levels. therefore, the present experiment was undertaken to evaluate the interactiv...

global concern of protection of the environment has led to researches on the effects of plants, natural extracts and organic materials to help maintain the postharvest quality of horticultural crops. throughout the present study, the effects of such natural products as: mint, thyme, savory, rosemary extracts, s-carvone, and humic acid on postharvest life of cut rose flowers, and the potential o...

three hundred and fifteen day -old chickens were used to test the relationship between oxygen-derived free radicals and the biochemical, hematological and pathological alterations(associtd with ascites). they were randomly divided into three experimental groups and ascites were developed in two groups of animals by exposing them to low temperature or administration of triiodothyronine (t3,), an...