NITROGEN FIXATION BY FACULTATIVE SYMBIOTROPHIC ASSOCIATIONS ISOLATED FROM THE RHIZOSPHERE OF FOXTAIL MILLET AS AFFECTED BY SEASON AND VARIETYN. RAJYA LAKSHMI, M. MOHAMMED RAFI
Nitrogen is an important element for growth, development and yield of many crops. Nitrogen fixation by non-symbiotic bacteria can be significant in cropping systems. The amount of nitrogen fixed by facultative symbiotrophic associations obtained from the non-rhizosphere and the rhizosphere samples of three varieties of foxtail millet isolated after 30, 45, 60 and 75 days of plant growth planted to black and red soils during Rabi and Kharif seasons in most cases increased from 30 days, attained maximum activity at 60 days and declined at 75 days. Among the three varieties, Prasad variety harboured the most efficient diazotrophic associations followed by Chitra and Lepakshi varieties indicating that the activities of the associations vary with the variety. The diazotrophic associations isolated from the rhizosphere samples obtained in Kharif season exhibited higher nitrogen-fixing activity when compared with the activity of the associations obtained in Rabi season. Thus the activity of the diazotrophic associations isolated from the rhizosphere of foxtail millet varied with the variety as well as the season.
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