IMPACT OF DIFFERENT WEED TYPES ON GROWTH AND YIELD OF MUNGBEAN (VIGNA-RADIATA L WILCZEK)

The influence of different weed types (grass, broadleaved and sedge sp ecies) on growth and yield parameters of mungbean (Vigna radiata L. Wi lczek) was evaluated under field conditions. The presence of all types of weeks had the most significant effect on growth and yields of mung bean. Broadleaved species alone had a greater adverse effect than gras ses, and the influence of sedges was the lowest. The adverse effect of weeds was most prominent on vegetative growth. The influence on yield components reduced with time. However, the adverse impact of weeds on yields was similar to that on vegetative growth. A significant correl ation between weed biomass and yield loss was observed. The study indi cated the critical competitive period to be in the vegetative phase. S ome possible implications for selective weeding are presented.