Weeds represent a global agronomic problem that threatens the productivity of cultivated crops. Weeds compete with cultivated crops for the available moisture, nutrients and light. Consequently, weeds significantly reduce either crop yield or quality. Control of weeds is essential to maintaining the production of economic crops. Weed control may be achieved either through manual eradication or ...

in order to study of the efficacy of herbicides in weed control of new seeded alfalfa, an experiment was conducted in hamedan and yazd cities, iran during 2009-2010. the treatments were bentazone (bazagran) (sl 48%) two, three and four l.ha-1, 2,4-db (butress) (ec 42.3%) 2.5, 2.8, 3.1 and 3.5 l.ha-1, imazethapyr (pursuit) (sl 10%) 0.4, 0.7 and one l/ha and without herbicide control treatment. t...

The means by which many herbicides kill susceptible plants are presently unknown (1, 3). Although it is not essential to know the mode of action in order to develop and use a herbicide efficiently, the screening processes by which herbicides are discovered are based upon comparative biochemistry. Selective herbicides with low nmammalian toxicity (2) must take advantage of differences in metabol...

in order to evaluate of pea, bean, lentil, wheat, rape and barley sensitivity to foramsulforun, rimsulforun and nicosulforun herbicides soil residue, a pot experiment was conducted at ferdowsi university of mashhad. experimental type was completely randomized design in factorial arrangement with three replications. treatments included herbicides (rimsulforun, foramsulforun and nicosulforun), he...

species using herbicides can improve forage availability and enhance ranch profitability by increasing the livestock carrying capacity of native pastures. However, deciding how and when to control noxious plants is crucial, and is generally more profitable on more productive soils with less brush. Factors that contribute to brush encroachment on rangelands include: • Fewer fires because of huma...

background: evaluation of herbicide pollution in aquatic environments needs the great concern and the most important echo-pollutant effects of herbicides are related to their effects on non target aquatic organisms. native fish can serve as a proper bio-indicator for evaluation  of pollution on aquatic ecosystems. objectives: to find environmentally friendly herbicides, in this study the acute ...

BACKGROUND Human health anomalies have been associated with pesticide exposure for people living in rural landscapes in the northern Great Plains of North America. OBJECTIVE The objective of this study was to investigate the occurrence of 45 pesticides in drinking water from reservoirs in this area that received water primarily from snowmelt and rainfall runoff from agricultural crop lands. ...