The effect of urea as adjuvant on herbicide effectiveness, yield and weeds of maize with full and reduced doses of herbicide

A field experiment was carried out to study the effect of urea as adjuvant for controlling the weeds in maize. The experiment comprised the following treatments; weedy check, manual hoeing, foramsulfuron + isoxadifen + isosulfuron-methyl sodium alone at 228.75 g a.i. per ha, and with 3% urea solution at 228.75, 190.39 and 152.50 g a.i. per ha. The maximum reduction in weed density and dry weight was recorded by manual hoeing at 20 and 40 days after spray, however, at harvest minimum weed density and dry weight was recorded with full dose of herbicide along with urea as adjuvant. The grain yield and yield components, except number of cobs per plant and grains per row, were affected significantly and maximum grain yield was obtained with manual hoeing which resulted in 93.05% increase in grain yield over weedy check.