Evaluation of integrated weed management of corn (Zea mays L.) in Qazvin province

In order to determine best density of silo corn (zeamays L) for good competition with weeds and attainment of acceptable economical yield، an experiment was conducted during 2009 as second cultivation in research farm of Takestan. The experiment was carried out as RCBD in factorial with four replications. Treatments were included density factor (recommended density، 25 and 50% more than recommended one) and weed management (two time weeding، without weeding، nicosolforon herbicide in 2-4 leaved of corn، 1 time cultivation in 20 cm height، two times cultivation in 35 cm of corn). Results showed that corn density and weed management had no significant effect on plant height، diameter of corn with hide، the number of row in corn، the number of seed in row، the number of seed in corn، the grain yield and the weight of 1000 seeds. Corn recommended density together no weeding caused the most diameter of stem، the number of seed in row، the number of seed in corn and corn density 50% more than recommended cause the most biological yield. The density of corn had a significant effect on density and dry weight of Amaranthus blit oides two months after treatments، while weed management had significantly effect in 1% probability level on density and the weeds dry weight in all sampling steps. Corn density by 50% more than recommended caused mostcontro of density and dry weight of Amaranthus blit oides and most decrease in the density and dry weight of Chenopodium album… The most control of dry weight of Amaranthus blit oides and Chenopodium album and most decrease density in Chenopodium album in all samplings most control of density of Amaranthus blitoides in last sampling in response to the treatments، two times weeding and one and two times cultivation was obtained.