Effect of urea different levels and simultaneous cropping of some legumes on agronomic characteristics and total biomass of corn

In order to effect of urea levels and simultaneous cropping of legumes on agronomic characteristics and total biomass of corn, this study was carried out in field of agricultural research center of Markazi province in 2013. A factorial arrangement of treatment in a randomized complete block design with three replications was used. Urea manure levels [N0= without urea (Control), N1= 75 Kg ha-1 of urea, N2= 150 Kg ha-1 of urea, N3= 225 Kg ha-1 of urea) and simultaneous cropping treatment, (S1= Cultivation of corn, S2= Cultivation of corn + chickpea, S3= Cultivation of corn + cowpea, S4= Cultivation of corn + mung bean) were assigned in plots. Results indicated that the effect of urea levels on the characteristics such as: wet weight of Stem + leaves, wide of ear leaf, dry weight of ear + husk, nitrogen agronomic efficiency, number of legumes grains per m-2, total biomass of corn + legumes and amount of nitrogen absorbtion was significant. Effect of simultaneous cropping treatment on the characteristics such as: wet weight of Stem + leaves, nitrogen agronomic efficiency, number of legumes grains per m-2, total biomass of corn + legumes and amount of nitrogen absorbtion was significant, too. The maximum and minimum of total biomass of corn + legumes (36.42 and 21.47 ton ha-1) were obtained with the (225 Kg ha-1 urea + Simultaneous cropping of chickpea and corn) and (non application of urea + Simultaneous cropping of corn and mungbean) treatments, respectively.