Effect of additive and replacement intercropping series of corn (Zea mays L.) and mungbean (Vigna radiate L.) on yield, yield components and weed biomass

A field experiment was conducted in a field located in Shirvan in 2011 to determine the effect of various corn and mungbean intercropping series on yield, yield components and weed biomass. The experimental Treatments were included: sole corn (C), sole mungbean (M), 75% corn+ 25% mungbean (C75M25), 50% corn+ 50% mungbean (C50M50), 25% corn+ 75% mungbean (C25M75), 100% corn+ 25% mungbean (C100M25), 25% corn+ 100% mungbean (C25M100), 100% corn+ 50% mungbean (C100M50), and 50% corn+ 100% mungbean (C50M100). The results indicated that intercropping treatments had significant effect on weed biomass. Additive intercropping leads to reduction of weed biomass when compared with replacement intercropping. The lowest weed dry weight was resulted from C50M100 treatment. This treatment leads to reduction of lambsquarters, pigweed and johnsongrass biomass compared with other treatments. The highest yield of corn (11254.33 kg.ha-1) and mungbean (1905.07 & 1840.17 kg.ha-1) was resulted from C100M25 and M and C25M100 treatments, respectively. The highest land equivalent ratio (LER=1.75) was obtained from C100M50 treatment.