allelopathic plants, because of reduction in herbicide uses, are important in weed management. the allelopathic effects of sage salvia officinalis and white wormwood artemisia sieberi water extract were evaluated on germination and seedling growth of redroot pigweed amaranthus retroflexus at concentration of 0, 5, 10, 15, and 20% in controlled conditions. anova revealed that the extract concent...

almolookhiyeh (corchorus olitorius l.) known in the world as a valuable medicinal plant that was produced for the first time in iran in 2011. this study was aimed to quantify germination response of almolookhiyeh to temperature. for this purpose, seeds were exposed to different constant temperatures (10 ,15, 20, 25, 30, 35, 40, 45 and 50°c) in seed research lab, gorgan university of agricultura...

Seeds of a Hawaiian rain forest tree species, Metrosideros polymorpha, were germinated at temperatures ranging from 5 to 35°C and under photosynthetic photon flux densities ranging from 0 to approximately 2000 IlE·m-2·s-1. Results after 30 days indicate that 25°C is the optimal temperature and 170 IlE·m-2·s-1 or about 4-15 percent relative irradiance is the optimal light intensity for M etrosid...

Allelopathy can be regarded as a component of biological control in which plants are used to reduce the vigour and development of other plants. Allelopathy refers to the direct or indirect chemical effects of one plant on the germination, growth, or development of neighbouring plants. The allelopathic effects of leaf extracts of Thymus vulgaris, Lavadula sp, Rosmarinus officinalis and Eucalyptu...

OBJECTIVE The goal of this study was to evaluate parents' capability to assess their febrile child's severity of illness and decision to present to the emergency department. We compared children referred by a general practitioner (GP) with those self-referred on the basis of illness-severity markers. METHODS This was a cross-sectional observational study conducted at the emergency departments...

abstract germination and emergence of cold tolerant lentil genotypes sometimes experiences low temperatures and variable rainfalls in the fall planting. this study was conducted to evaluate the effects of drought stress on germination stage of lentil genotypes. experiment was carried out with 18 lentil genotypes under five levels of water potential (0 , -0.4 , -0.8 , -1.2 , -1.6 mpa) using peg ...

an experiment was conducted to determine the aging mechanism in safflower seed using natural aging treatment (storing seed at room temperature for six years) and accelerated aging ( incubating the seed at 41?c and close to 100% relative humidity for 4 ,8 and 12 days). the results indicated that both natural and accelerated aging reduced germination percentage, seed vigor and activity of catalas...