Among the total six isolates, isolates LAIS-21, LAIK-06 and LAIJ-04 were more potential regarding nitrogen fixation and fixed 19.2 mg, 14.9 mg and 11.0 mg N g-1 malate, respectively. Out of these three isolates, isolate LAIS-21 recorded higher plant height (45.5 cm), number of fruits per plant (36.2), fruit diameter (4.8 cm), fruit weight (57.9), root length (10.3 cm), fresh root weight (23.7 g), yield per plant (2.1 kg) and N content in leaf (58.8 g kg-1), in comparison to other isolates, and also recorded 31.8, 54.7, 23.7, 9.2, 60.9, 23.7, 110.0, 34.6% increase in aforementioned parameters over control under green house conditions. Isolate LAIS-21 also recorded highest yield (808.3 q ha-1) of tomato under field conditions with 92.4% increase over control.
Key words: Azospirillum, nitrogen fixation, tomato, yield and yield attributing characters.
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