RESPON PEMBERIAN KEPADATAN POPULASI BAKTERI PENAMBAT NITROGEN AZOSPIRILLUM SP. YANG DIISOLASI DARI RHIZOSFER PERTANAMAN KEDELAI TERHADAP PERTUMBUHAN VEGETATIF KEDELAI (GLYCINE MAX L. MERR.)
ABSTRACT: A research was aimed
to decribe the effect from the population density of nitrogen-fixing bacteria
of Azospirillum sp. to soybean (Glycine max L. Merr.) vegetative growth.
Research was conducted at the Laboratory of Agroecology and Garden Experiment
of Agriculture Faculty in Sultan Ageng Tirtayasa University starting from
August until October 2013. This research used factor Randomized Completely
Block Design (RCBD). The factor was consisted of 6 levels which were without
giving Azospirillum sp. (AZ0), population density of Azospirillum sp. 102
cfu/ml (AZ1), 104 cfu/ml (AZ2), 106 cfu/ml (AZ3), 108 cfu/ml (AZ4), 1010 cfu/ml
(AZ5). Each one was repeated 4 times with further test of Duncan’s Multiple
Range Test 5%. The observation was consisted of several parameters, that were
plant height, quantity of leaves, root length, leaf area, crown dry weight and
root dry weight. The results showed the two isolates founded of bacteria
Azospirillum sp. who was ability to fixating a nitrogen from soybean
rhizosphere soil with each given code Azp1 and Azp2. The population density of
Azospirillum sp. also showed significantly different at 3, 4 and 5 weeks after
planting and high significantly different at 6 weeks after planting of plant
height parameters of soybean plants.
Penulis: Dewi Firnia, Kartina
AM, Cori Damayanti
Kode Jurnal: jppertaniandd140746
