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One of the most important replacement methods used instead of chemical herbicide andconventional tillage is cover and companion crops’ application which is a major factor in sustain-able agriculture. In order to determine the best cover crop in controlling weeds of corn field and itsfurther effects on corn yield, an experiment was carried out in a factorial arrangement based onRCB design with three replicates. The treatments of this experiment included companion crops (clo-ver, hairy vetch, basil and dill) as first factor and time of sowing cover and medicinal plant (syn-chronic sowing with corn and sowing 15 days after corn sowing) as second factor. The resultsshowed that ear weight, ear length, leaf weight, grain length and yield were significantly influencedby companion crops and sowing date. Whereas, weed biomass was influenced by cover croptype · sowing date interaction. Also, the results indicated that increasing biomass weed resultedin linear reduction of grain yield. The highest ear weight, ear length, leaf weight, grain lengthand yield were obtained for cultivation of clover with corn. Synchronic cultivation of companioncrops with corn had higher grain length and yield compared with cultivation 15 days after corn.The lowest weed biomass was recorded for concurrent cultivation of corn with clover due to rapidgrowth and high competitive power of clover in the early stage of growth.
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