The Effect of Shoot/Root Competition of Black night shade (Solanum nigrum) on Growth and Seed Yield of Mung Bean (Vigna radiate L.)

In order to study the competition effects of Solanum nigrum on Vigna radiate yield, an additive experiment was conducts at Ferdowsi University of Mashhad experimental Greenhouse. The type of design was completely randomized block. Treatments included three density of Solanum nigrum (2, 4, and 6 plants m-2) and three types of competition (root, shoot and both of them) planted at constant density of Vigna radiate plus weed free check in each block. The results indicated that competitions had significant effects (P<0.05) on plant height, number of seed per plant, number of pods per plant, seed yield per plant, biological yield and harvest index. The control, treatment of root+shoot competition and 6 Plants m-2 of Solanum nigrum densities has the highest and lowest number of seed per plant. Therefore, result of this experiment indicated that weed competition with crops can reduce the plants yield. Plant height, number of seed per plant, number of pods per plant, seed yield per plant, biological yield and harvest index were decreased, when the densities of Solanum nigrum were increased.