Effect of intercropping different ratios on yield of soybean, sweet basil and borage

In order to assess soybean، sweet basil and borage yield intercropping system، an experiment was conducted based on randomized complete blocks design with 9 treatments and three replicates in 2011. Treatments were consisted of replacement ratios of 75:25، 50:50، 25:75 soybean: sweet basil and borage and pure culture of each plant. The results showed that the first pod in 75:25 soybean: borage and sole cropping of soybean observed to be positioned at upper height than other treatments. The node number of stem was more in intercropping treatments than sole crop. In intercropping treatments، the pod number per plant except 25:75 soybean: borage and seed number per plant except 25:75 and 50:50 soybean: borage was higher than sole crop. Seed yield and biological yield was decreased by increasing sweet basil and borage proportions in intercrop except 75:25 soybean: sweet basil. The seed yield and dry weight of plant of intercropping was higher than pure culture of soybean. Yield of sweet basil in both growth period and also seed yield of borage was decreased through increasing soybean presence. Area time equivalent ratio indicated 9، 11 and 14 percent advantages of the 75:25 soybean and sweet basil and borage ratio and 50:50 soybean and borage compared to monoculture، respectively.