in order to study the effect of different levels of nitrogen and sulfur fertilizers on yield, yield components, content of some elements, qualitative and quantitative traits of spring safflower (serin cv.) an experiment was conducted at agriculture and natural resource research station of ardabil in 2008. this experiment was carried out in factorial experiment in completely randomized block des...

I n r e c e n t y e a r s , c o m p a n i e s h a v e i n c r e a s i n g l y s u b c o n t r a c t e d p a r t s o f t h e i r m a n u f a c t u r i n g o p e r a t i o n s t o t h i r d p a r t y m a n u f a c t u r e r s , t h u s l e a d i n g t o a n e n o r m o u s g r o w t h i n t h e n u m b e r o f s u b c o n t r a c t o r p l a n t s . T h e s e a r e s p e c i a l i z e d i n t h e...

introduction saline wastewaters contain mineral salts which are often produced by industries such as seafood processing, cannery, vegetables, and tanning. they are imported into the sewage collection network. in coastal cities, saline water consumption seems indifferent in household parts and highlevels ofground water, leaksaltwater, precipitation duringdifferentseasons,and sea level are the ot...

soil reduces the hazardous effects of compounds on the components of ecosystem because of self –purification property and the ability for their fixation. playing such a role in soils under redox conditions is performed by pedogenic fe-mn concentrations. in order to investigate cobalt, copper and lead accumulation in iron and manganese concentrations, at first the concentrations were precisely s...

W e u s u a l l y t h i n k o f p l a n s a s l i n e a r sequences o f a c t i o n s . T h i s i s b e c a u s e p l a n s a r e u s u a l l y e x e c u t e d one s t e p a t a t i m e . Bu t p l a n s t h e m s e l v e s a r e n o t c o n s t r a i n e d b y l i m i t a t i o n s o f l i n e a r i t y . T h i s p a p e r d e s c r i b e s a new i n f o r m a t i o n s t r u c t u r e , c a l ...

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...

a field experiment was conducted in research farm of isfahan university of technology, isfahan, iran in 2011 . various weeding periods were investigated on growth and yield of potato under drip tape and furrow irrigation systems. a split plot arrangement was used in a randomized complete block design with three replications. irrigation treatments were included in main plots and periods of weed ...

drought is the most common environmental stresses that affects plant growth. to study the combined effects of arbuscular mycorrhizal fungi (glomus intratadices) and jasmonic acid on growth and ecophysiologycal characteristics of pistachio seedlings cv. qazvini under drought stress, a greenhouse experiment was conducted in a completely randomized design with three replications. experimental fact...

this study was conducted to study of morpho-physiological responses of robinia pseudoacacia l. seedlings under drought stress by irrigation period at 4 levels (intervals of 4, 8, 12 and 16 days). the experiment was performed as completely randomized design in a greenhouse environment. results indicated that all studied traits were affected by water stress, except water use efficiency (wue). the...

to study the effects of different levels of water stress and nitrogen fertilizer on seed yield and yield components of two common bean genotypes (phaseolus vulgaris), an experiment in a split plot factorial based on crbd with four replications was conducted at the research farm of university of tehran (karaj-iran) in 2010. water stress treatments as the main factor included normal irrigation (6...