This research evaluated the effectiveness of biodegradable mulches for weed control in container-grown ‘Martin’ giant arborvitae (Thuja plicata) and measured the effects of these mulches on evaporation and substrate temperature. The experiment was carried out in the 2008 and 2009 growing seasons. Four biodegradable mulching materials were tested and compared with a chemical control (oxadiazon) ...

in order to evaluate the effects of crop cultivars and living mulchon sunflower yield and weed control, a field experiment was carried out as factorial arrangement based on a randomized complete block design with three replications in 2013. treatements were sunflower cultivars (‘azargol’, ‘allstar’, ‘farokh’) and weed control treatments (weed-free, weed-infestation and intercropping of fagopyru...

the most problematic weed in summer crops in alashthar town is ground cherry (physalis divaricata). in this research, the emergence pattern of this weed in sugar beet and wheat crop was investigated during 2006- 2007. seed dormancy was also studied from october to may in two depths 0 and 10 cm, based on a factorial experiment. the results indicated that the emergence of this weed starts late ap...

A general model of crop yield response to herbicide application is proposed. The model includes three components: the effect of herbicide dosage on weed density, the effect of surviving weed density on crop yield and the effect of herbicide directly on the crop. The model is used to estimate the response of wheat yield to application of diclofop-methyl to control ryegrass .(Lolium rigidum) in A...

Chemical-dependent weed control has led to the evolution of herbicide-resistant weeds and pollution arable land water systems, posing a great threat food security environmental safety. For first time, we developed simple management regime ecologically deplete seed bank under wheat-rice cropping system, which in turn allowed reduction frequency conventional herbicide applications while sustainab...

Seasonal variation (e.g. temperature and photoperiod) between growing seasons might affectinulin content and inulin yield of Jerusalem artichoke. However, there is limited information ongenotypic response to seasons for inulin content and inulin yield. The objective of this studywas to investigate the variability in genotypic response to seasons for inulin content and inulinyield of Jerusalem a...

The effect of weed management that targets the seed stage on subsequent life stages is largely unknown. Post-dispersal predation reduces number seeds from soil surface before contribute to seedbank. Density-dependent processes can mitigate in stages. In this study, we tested if (i) targeting affects seedling stage; (ii) density-dependent mortality partly compensates abundance; and (iii) magnitu...

According to the importance and diversity of Chenopodium album, Cynodon dactylon and Amaranthus retroflexus in safflower fields and significant role of safflower (Carthamus tinctorius L.) as an oil seed, an experiment was conducted using CRD based factorial design with three replications to study the allelopathic effects of root and shoot extracts of these weeds on germination and early growth ...

This study examines the relationships between atmospheric influences and grain yields as well as yield components: crop density (ears m−2), number of kernels per ear and kernel weight of winter rye. The study uses data of a long-term field experiment at Berlin-Dahlem for the period between 1962 and 1996. The crop density and kernel number of winter rye were positively influenced by warm and sun...

in order to study the different levels of irrigation on diversity, density and compound of weed species in corn field, experiment was conducted at agricultural research station, ferdowsi university of mashhad during growing season of 2008-2009. the experiment was with four levels of irrigation (6130, 7290, 8800 and 12330 m3) and four levels of weed control (complete control, broad-leaves contro...