Crop losses to weeds can be exacerbated in modern agricultural systems because crop cultivars have high population yields but low individual competitiveness. High density cropping offer the possibility of effectively suppressing by increasing initial size-asymmetric advantage crops over weeds. We tested this hypothesis an outdoor mesocosm experiment with two old (Cultivar Heshangtou (HST) and J...

Cyperus iria is amongst the most threatening weeds of rice in Sri Lanka, India, Pakistan, and Philippines. Broad knowledge about ecology fecundity C. important for its effective management. Field studies were conducted over two seasons (wet (WS) dry (DS)) to investigate influence populations (40 80 plants m−2) on growth, survival, fertility, with four emergence times, 3, 15, 30, 45 d after (DAR...

background and objectives: early watergrass (echinochloa oryzoides) is considered as a new-introduced species and then as a potential invader. investigation of competitive traits of this species, in comparison with barnyardgrass (e. crus-galli), one of the most important weeds in rice fields of guilan province, would be useful to determine its spreading possibility as an aggressive weed. theref...

The wild sunflower, an invasive alien species, is known to affect the performance of field crops. A experiment was conducted estimate effects different levels sunflower and common bean densities on yield components grain yield, as well quantify loss due their competition at varying densities. laid out in a randomized complete block design factorial arrangement with four replications. Hence, com...

to evaluate the role of effective factors on competition of two wheat cultivars against two species of narrow leaf and broad leaf weeds this study was conducted as two separated experiments based on a randomized complete block design with 3 replications at agricultural faculty of bu-ali sina university, in 2008-2009. in both experiments, alvand and sayson cultivars were planted with densities o...

The crop chosen for this study is chickpea (Cicer arietinum L.) as the fourth most important legume in Australian agriculture (FAOSTAT 2004). One of the major obstacles in growing this crop is its poor competitive ability with weeds, which leads to significant reductions in yield. The best method to control weeds in crops such as chickpea is through the use of integrated weed management (IWM). ...

Good management models for postemergence weed control require good estimates of which weed density produces an economic threshold yield. Because intraweed competition increases if weeds are aggregated, weed spatial pattern may be an important factor for inclusion in management models. Mathematical models of weed–crop competition have demonstrated that this may be the case, but the small number ...