the allelopathic effects of various concentrations (0 (as control), 5 %, 10 %, 20 % and 40%) of berseem clover shoot extracts were assayed on germination and radicle growth of four weed species ( amaranthus hybridus, amaranthus albus, solanum nigrum and chenopodium album) as completely randomized factorial with 3 replications. the effect of aqueous extract concentration of berseem clover on the...

abstract r. ficaria is an invasive perennial and tuberous roots weed. the most important means of its reproduction and dispersion are tubers. in order to study the effect of droughty and freezing on germination of lesser celandine tubers, two experiments were conducted at weed science laboratory of faculty of agriculture ferdowsi university of mashhad in 2008. the experiment was a completely ra...

the philosophy of biology has existed as a distinct sub-discipline within the philosophy of science for about thirty years. the rapid growth of the field has mirrored that of the biological sciences in the same period. today the discipline is well represented in the leading journals in philosophy of science, as well as in several specialist journals. there have been two generations of textbooks...

An Evaluation of the Invasive Potential of Beach Vitex (Vitex rotundifolia) Charles A. Gresham and Amber Neal The Belle W. Baruch Institute of Coastal Ecology and Forest Science, Clemson University P. O. Box 596, Georgetown, SC 29442 ABSTRACT This study was conducted to determine if the introduced woody plant Beach Vitex, Vitex rotundifolia (Verbenaceae), (BV), has the potential to displace nat...

GAGNON, P. R. AND W. J. PLATT (Louisiana State University, Department of Biological Sciences, 202 Life Sciences Building, Baton Rouge LA 70803). Reproductive and seedling ecology of a semelparous native bamboo (Arundinaria gigantea, Poaceae). J. Torrey Bot. Soc. 135: 309–316. 2008.—Canebrakes were monodominant stands of bamboo once common in bottomlands throughout the southeastern U.S. They wer...

Nowadays, in many rangelands, due to over grazing, and problems that some plantshave in germination, the rate of forage production is greatly reduced. So to take advantages ofthe benefits of such plants, it is necessary to identify and remove barriers of germination andestablishment of suitable plants. The present study was designed to investigate differenttreatments of breaking dormancy and st...

deterioration of seed is one of the most important limiting or even hindering factors in its germination. an evaluation and understanding of the factors responsible for/ and enhancing seed deterioration is of paramount importance. the main aim of this study was to determine the effects of seed deterioration on its germination and as well on the activities of antioxidant enzymes in canola culitv...

in order to evaluate the effects of methanol on germination percentage, germination speed index, plumule and radicle length, plumule and radicle dry weigh, vigor index and consumed endosperm of bean in condition of water deficit, a factorial experiment done based on completely randomized design with three replications. the first factor was different levels of methanol included 0 (control), 5, 1...