Pengaruh Inokulasi Bakteri Terhadap Pertumbuhan Awal Jarak Pagar (Jatropha curcas L.)

Abstract

ABSTRACT
Bacterial inoculants affect the early growth of Jatropha (Jatropha curcas L). Genera of
Azotobacter, Bacillus, Chromobacterium, Citrobacter, Nitrosomonas, Rhizobium, and
Spaerotillus natans were soil bacterial isolates. The soil was collected from numerous places
around Pontianak, West Kalimantan. Those isolates were used as inoculants, and formulated
to single and mixed bacterial inoculants, then used to stimulate the early growth of jatropha
seedling in 15 weeks at greenhouse condition. Bacterial inoculations caused better growth
performance compared to its control as pure soil garden medium without inoculations, and
neither to bare soil dresses with compost. In the presence of inoculants, plant height was
accelerated quickly while other inoculants affected to stalk diameter development. Daily growth
performance of jatropha peaked in 8 and 11 weeks after inoculation of Citrobacter and
Nitrosomonas bacterial component were used as single inoculant, respectively. The increasing
of shoot biomass accumulation was three times as caused by single inoculants (Bacillus sp),
and the highest one up to four times of biomass weight caused by a mixture inoculants as
consortium of Azotobacter, Bacillus, and Nitrosomonas spp. That selective inoculant has
opportunity to be used for jatropha farming, and this basic study is meaningful to jatropa
cultivation for standing to bio-fuel resources.
Keywords: Jatropha curcas L., inoculants, Azotobacter, Bacillus, Chromobacterium,
Citrobacter, Nitrosomonas, Rhizobium , Spaerotillus natans.
Kata kunci: Jatropha curcas L., inoculants, Azotobacter, Bacillus, Chromobacterium,
Citrobacter, Nitrosomonas, Rhizobium , Spaerotillus natans.