Nitrogen fixation and nodulation behaviour in relation to seed source variations in dalbergia sissoo seedlings
2002
N. Singh | T.C. Pokhriya
Nitrogen fixingabilities of six Dalbergia sissoo seed sources, namely, Sibsagar (Assam), Tulsipur-Gonda,Chiriyapur, Hissar (Haryana), Simblewala (Jammu and Kashmir) and Kankai(Nepal), from the entire distribution range of this species in India and Nepal werestudied at the Forest Research Institute, Dehra Dun (32° 20' 40" N latitude, 77° 52'12" longitude), India from 1997 to 1999. Significant differences in nodulation behaviour,nitrogenase activity and soil nitrogen accretion were observed between differentseed sources. Maximum nodule biomass and nitrogen fixation were recorded inGonda seed source followed by Nepal, Chiriyapur, Jammu, Hissar and minimum inAssam. A positive correlation was noticed between nodule number and its biomasswith nitrogen fixation ability. The differences were discernible and pronounced onlyduring the second year of growth. These are important to exploit the geneticvariability among different seed sources of D. sissoo in amelioration of degraded sites.
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