effects of biofertilizers and different water volume per irrigation on vegetative characteristics and seed yield of sesame (sesamum indicum l.)

in order to study the effects of biofertilizers and different water volume per irrigation on vegetative characteristics and seed yield of sesame (sesamum indicum l.), an experiment was conducted at the research greenhouse of faculty of agriculture, ferdowsi university of mashhad, during 2009. this experiment was conducted as factorial based on randomized complete block design with three replications. the first and the second factors were biofertilizers (nitragin, nitroxin, bio-phosphorus and control) and water volume per irrigation (100, 200 and 300 ml), respectively. the results showed that the simple effects of biofertilizer and irrigation volume were significant (p≥0.05) on plant height, the first internode length, number and dry weight of leaves, dry weight of stem, chlorophyll content and relative water content (rwc) of sesame. also, interaction between biofertilizer and water volume per irrigation was significant (p≥0.05) plant height and rwc. the maximum and the minimum sesame seed yield were observed in nitragin and control with 204.4 and 100.0 kg.m-2, respectively. the highest seed yield was observed in 100 ml (202.1 kg.m-2) and the lowest was achieved with 300 ml (170.1 kg.m-2) per irrigation water. application of biofertilizers enhanced root development and hence availability of moisture and nutrients, particularly nitrogen and phosphorus. on the other hand, since these fertilizers are promote of growth regulator and hence in basement of growth and photosynthesis of sesame. with increasing irrigation volume from 100 to 300 ml, growth of sesame was decreased. therefore, sesame application of biofertilizers could improve its vegetative characteristics in dry and semi-dry regions.