Incorporation of NPK into weed-crop interspecific relationships in a corn-bean successional system

Weeds are capable of producing significant changes in the structure, composition and processes of the agroecosystem. The objective of this study was to determine the biomass contribution of weeds in their interspecific relationships with maize and bean crops in succession. A randomized block design with 14 treatments and four replicates was used, where weeds were sampled at different times of the cycle of the crops under study. Coverage, dominance and NPK contribution were determined in weeds. The dominant species in crop-weed competition were C. rotundus and R. exaltata in maize and S. halepense in beans. The interspecific coexistence of arborescens-crops, outside the critical period, increased biomass and nutrients. Boerhavia sp. and S. halepense accumulated the highest amounts of NPK.