To investigate the effect of sowing date and manure fertilizers on morphological traits of indian mustard (Brasica juncea L.) , an experiment was carried out at the field experiment of ghazvin, iran. A factorial experiment based on randomized complete blocks design (RCBD) with three replications was followed in the study. Results represented that morpholological traits were significantly affected by different sowing dates and manure fertilizers. the highest and lowest plant height was gained by sowing date of 1th October and 1th November. sowing date of 11th October, 21th October and 1th November decreased 20.26%, 40.53% and 60.98% on plant height in compare with sowing date of 1th October. maximum and the lowest branch number was gained by application of 45 ton/ha manure fertilizer and non-application of manure fertilizer treatment. utilization of 15 ton/ha, 30 ton/ha and 45 ton/ha manure fertilizers increased 11.65%, 19.74% and 24.91% on branch number in compare with control. Sowing date of 11th October, 21th October and 1th November decreased 18.31%, 36.37% and 55.57% on stem diameter in compare with sowing date of 1th October. Means comparison of interaction between sowing date and manure fertilizer treatment represented that in sowing date of 1th October, application of 30 ton/ha and 45 ton/ha manure fertilizer had similar effect on pod length however maximum of pod length was obtained by sowing date of 1th October together with application of 45 ton/ha manure fertilizer. the lowest pod length was witnessed by sowing date of 1th November and non-application of manure fertilizer.
