abstract in this study, willingness to pay of 180 wheat farmers in khorasan razavi province to remove weeds in different options and different growth stages in 2008 through logarithmic regression was investigated. the results indicated that farmer's total annual income, being perennial of weeds and dummy variables percent of removing weeds in growth different stages, had positive and significan...

abstract some agricultural fields of razevi and north khorasan provinces were sampled for identification and resistance to metalaxyl of pythium ultimum species isolates. isolation was done between years of 2007 to 2009. van der plaats- niterink key to species of pythium and specific its region of rdna were used for morphological and molecular identification respectively. micrometric characteris...

Abstract Leptospirosis is an important zoonotic bacterial disease caused by Leptospira spp. Earlier studies from North Khorasan province (Iran) reported the presence of in wild canines and rodents. To date, there no data on seroprevalence leptospirosis among humans this province. This study was performed to determine prevalence human leptospiral infection people with different occupations. The ...