in order to evaluate and drought tolerance selection in cowpea genotypes and to identify the best indices for drought tolerance, an experiment was conducted at research field university of tehran in karaj during 2011-2012 growing season. in this study, 31 cowpea genotypes were evaluated in a randomized complete block design (rcbd) with three replications under normal irrigation (non- stress) an...

sensivity of seed germination stage to saline soil is the main obstacle to proper field establishment of sugar beet crop. in previous studies different tissues of sugar beet showed high tolerance to salt stress by of increasing sodium chloride levels in in vitro condition. an experiment was by to study the response of sugar beet zygotic embryos to salt stress in in vitro conditions. sterile per...

in the present experiment, the effects of nitrogen and phosphor fertilizer application in two methods of furrow and trickle irrigation on the yield and quality of sugar beet seed cultivar 7233 were studied. the experiment was conducted as a split factorial in a completely randomized block design with three replications during 2003 and 2004 in hamedan province. main plots were allocated to irrig...

the digestibility and fermentation parameters of the diets containing leaf, pod and seed of the subabul tree in sheep was determined by using two steps digestion and gas production (gp) methods. the experimental diets consisted of 0.0 (control), 25, 50, 75 and 100 percent of the leaf, pod and seed of the subabul tree that were replaced with alfalfa in diets of sheep. diets containing 50 percent...

the district of miyān kūh in the ardal town,chahār mahāl bakhtiari province, because of its high mountains, deep valleys and the fields among small mounts, being placed in the path of the was dering tribes has been the focus of the attention. the rigion has two different viewpoint. one part featuring the mounts chēhēl cheshme and gereh with the altitude of more than 3500 m., has cold winter and...

background and objectives: over the last decade, climate change has been one of the most challenging issues in the scientific papers. studying the impacts of climate change on crop productivity at regional scale will depend on the right estimate of future climate. this estimation is being implemented by climate models and most of them by general circulation models (gcms). this study aims at pre...

to study the effect of plant density on seed yield and yield components of two lentil cultivars a field experiment using factorial design based on a complete block design was conducted with three replications at research farm of college of agriculture and natural resources, university of tehran (karaj) in 2008. treatments were lentil varieties (ziba, mardom), and plant densities (80, 160, 240, ...

functionalized indeno[1,2-b]chromene derivatives have been synthesized via condensation reaction of 1h-indene-1,3(2h)-dione with benzaldehyde and cyclization with 2-hydroxynaphthalene-1,4-dione in the presence of a catalytic amount of triethylamine (et3n) in etoh at room temperature. it was observed that benzaldehyde bearing electron donating group gave high yield of product, whereas, benzaldeh...

drain envelopes play significant roles in the performance of drainage systems due to theirreduction in letting sediments into the drainpipes and also because of an increase in thehydraulic conductivity of soil around the drainpipes. throughout the present research, theeffect of a one 1000 hour flow on dual envelopes consisting of geotextile as a means ofimproving the hydraulic gradient and rice...

this research was aimed to investgate the effect of light quality on micropropagation of pear rootstock oh×f333. first, single nodes explants were cultured in modified ql medium containing ba at four levels (0, 0.5, 1, and 2 mg/l-1) and iaa at three levels (0, 0.1, and 1 mg/l-1) and were evaluated for shoot proliferation. then, plantlets subcultured in modified ql medium containing 1 mg/l-1 ba ...