بررسی اثر تراکم بر عملکرد و اجزا عملکرد لوبیا

In order to study the effect of density on yield and yield components of been an experiment with Split plot design was canducted in Khorasan agricultural research center for three years (1371- 1373). Main- plots consisted of four row distances (30, 40, 50, 60 cm) and sub- plots consisted of four plant distances within rows (5 , 10, 15, 20 cm). Effect of row distances on plant height and height of first pod from the ground was significant and by decreasing row distances plant height was increased. Increasing row distances caused the number of stem per plant tobe increased. Number of pods per plant number of seeds per pod, seed weight per plant, biological yield per plant and pod weight per plant were also increasd by increasing row distances. Effect of plant distance within rows on plant height and height of first pod was significant and with increasing plant distances on rows, height was decreased, while there was a significant increase in the number of stemS per plant, number of pods per plant number of seeds per plantJ biological yield per plant and pod weight per plant. Density had not significant effects on growth stages but the effect of density on the number of seeds per plant, seed weight per plant, biological yield per plant and pod weight per plant was negative, and with increasing density there was a significant decrease in the above mentioned attributes. By increasing the density plant yield was also decreased but grain yield per hectar was increased. Efficts of row distance and plant distance within row, on the grain yield per hectar was significant and with decreas of the distances, there was an increase in grain yield per hectar. Interaction between row distances and plant distance with rows was not significant. Results showed that the best row distance and plant distance within rows for bush types bean are 40 em and 10 em respectively.