Abstract:
Abstract. Phosphorus compound in the critical land is relatively low
that caused phosphorus is bonded to metals. The isolate BRC-AP
and BRC-AK are a phosphate solubilizing bacteria (PSB) indigenous
critical land that has the ability to dissolve phosphate. The used of
phosphate solubilizing bacteria are able to improve plant growth on
critical lands. The aimed of this study was to measure the growth rate
of shoot length, root length and biomass of root, and leaf cuttings
elephant grass (Pennisetum purpureum cv. King Grass) which inocu lated with the consortium of phosphate solubilizing bacteria and IAA
producing fungi. Phosphate dissolving activity is determined by the
formation of clear zone in solid Pikovskaya medium, synergism assay
between bacteria and fungi observed on SDA medium then proceed
testing the ability of bacteria and fungi consortium to promote plant
growth. The result showed that the highest of phosphate solubility in dex was found in isolate BRC-AP (27), addition of the combination
of isolate BRC-AP, BRC-AK and Humicola sp. R.Dn have significant
effect on shoot growth in the first week and leaf dry weight. The high est length shoot of cutting elephant grass was found in treatment with
the consortium of phosphate solubilizing bacteria and IAA producing
fungi (BRC-AP + BRC-AK + KP) (58.66 cm). The highest of leaf dry
weight was found in treatment with BRC-AP + BRC-AK + KP (5.65
gr). The addition of consortium phosphate solubilizing bacteria and
IAA producing fungi from South Kalimantan critical land proved can
improve plant growth especially length shoot and leaf dry weight.
