abstract in order to study the effects on salinity and silicon application on yield and yield components of purslane (portulaca oleracea l.), an experiment was conducted in a completely randomized desgin with three replications and two factors consisted of four different levels of salinity using nacl (0, 7, 14, 21ds/m) and two levels of silicon (application of one mmol sodium silicate and not a...

topping stage of tobacco is a key time for development of agriculture measures to promote the quality of leaves. in order to investigating influence of topping timing and suckericide content on tobacco leaf, a factorial experiment on the basis of rcb design with 3 replications was conducted in 2011 at the tobacco research farm of isfahan. treatments were including topping time (t1: topping at e...

salt stress is one of the most chalanging abiotic stresses affecting natural productivity and causing significant croplosses worldwide. a greenhouse experiment was conducted to evaluate the response of two alfalfa cultivars (bamiand hamedani) to 6 levels of salinity (0 as control, 25, 50, 75, 100, 125 mm nacl) at the college of agriculture,shiraz university, shiraz, iran in 2008. plant dry weig...

this research was carried on in order to investigate the response of wheat cultivars to salinity tension as factorial experiment and in complete randomized block design in four replications in islamic azad university shoushtar branch. in this experiment the response of nine wheat cultivars including chamran, karchia66, mahoti, roshan, alvand, kavir, ghods, atrak and tjan at vegetative growth st...

intercropping systems lead to reduce weeds population and their biomass. in order to study effect of marigold (calendula officinalis) and mungbean (vigna radiata) intercropping in different sowing times on yield and weeds control a factorial experiment based on randomized complete block design was performed in islamic azad university, tabriz branch, iran, during 2012 in three replications. stud...

Dry direct-seeded rice is an alternative cropping technique that should require less water and labor than the classical method of transplanted-flooded rice. Weed competition major biological constraint in this resource-conserving production reducing crop yield by 30–80%. This study evaluated effects different seed coating treatments on performance dry direct seeded under field conditions. The u...

for comparison of the food value of four different epecies of aquatic weeds: potamogeton pectinatus , potamogeton lucens, potamogeton perfoliatus, najas minor and two species of terrestrial grass: medicago sativa and cynodon dactylon by grass carp (ctenopharyngodon ideda), was studied in the shahicl rejai fishfarm in sari (province of mazandaran). totally 6 concrete ponds with 30 cubic meter vo...

in order to investigate the effect of chemical herbicides on control of broad leaf weeds of common bean, an experiment was conducted in 2007 at yasouj with 12 treatments in a randomized complete block design with 3 replications. treatments consisted of preplant application of trifluralin herbicide at 960 g ai ha-1; postemergence application of bentazon at 1200 g ai ha-1; imaztapir at 50, 75 and...

Weeds around rice crops can cause competition and then must be controlled. Pre-emergence weed control by utilizing extract as herbicides is the alternative solution for substituting synthetic herbicides. In addition, allelopathic compounds of inhibit seed germination other species. This study aims to know efficacy types bioherbicides growth increase yields. The was conducted from 2021 - 2022 in...

Weeds pose major constraints in crop production. The use of allelochemicals and allelopathic species can provide an effective alternative for sustainable weed management. In a previous study that evaluated the activity wild cultivated plants Turkey, Hibiscus sabdariffa demonstrated strongest inhibitory potential. This aimed to estimate phytotoxic influence H. water crude extracts on Lactuca sat...