the genus calendula belongs to tribe calenduleae, (asteraceae family). itmorphologically studied for the ongoing project of the flora of iran. based on the herbarium studies and field observation, this genus has been revised. the study was based on fresh material from field as well as herbarium specimens. all specimens existed in the herbarium of research institute of forests and rangelands (ta...

Increasing plant density is one of the main approaches of achieving higher yields for modern maize crop. However, there exists leaf redundancy for high-density maize, and leaves of the upper canopy shade more competent leaves at the middle strata. In a two-year field experiments, Jinhai5, a semi-compact corn cultivar, was grown at a density of 105,000 plants ha-1 grown until 3 days after silkin...

The Osawa River, which has its headwaters at the top of Mt. Fuji, one largest failure in Japan, Failure, uppermost part catchment. Failure produces more than 100,000m 3 sediment every year by erosion and collapse, causes debris flows slash avalanches. Since opening 1970, Fuji Sabo Office been observing dynamics River through field surveys, observation equipment aerial photogrammetry, laser surv...

remote sensing is one of the techniques recently used in order to monitoring and predicting crop yield. the objective of this study was predicting wheat yield in mashhad during 2009 and 2010 by landsat (tm) and (etm+) images with ground based data. for this purpose, three images dated 6, 14 and 22 jun 2009 and 8 and 24 may and 9 jun 2010 were analyzed and vegetation indices were computed. field...

there is a growing interest among the higher education principals and policy makers to improve teacher evaluation methods and more important than that to use the evaluation data. a number of research studies implied the ineffective instruction of esp courses in iran (atai, 2002; eslami, 2005; hayati, 2008; ahmadi, 2008; sherkatolabbasi & mahdavi, 2012; boniadi, ghojazadeh & rahmatvand, ...