Studies on Bacteria Solubilizing both Potassium and Phoshorus and Their Effect on Maiza (Zea Mays L.)
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Date
2013
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UAS, Dharwad
Abstract
Bacteria solubilizing both potassium and phosphorus isolated by soil samples
collected from different rhizosphere and crops from Dharwad, Haveri and Davanagere
districts of Karnataka. The total 50 bacterial isolates were tested for their potassium and
phosphrous solubilization and characterized upto genus level based on morphological and
biochemical characters.
In vitro evaluation of potassium and phosphorus solubilization by bacteria tested at
different days after incubation (DAI). The maximum solubalization of K and P observed at
15 DAI ranges from 2.36 to 29.83 μg/ml and 3.44 to 14.25 per cent respectively. All the
isolates were tested for beneficial traits like production of growth promotion substance and
the amount of IAA and GA produced by the isolates ranged from 3.38 to 8.90 μg/25ml and
1.27 to 3.67 μg/25ml respectively.
The efficient eight isolates of Bacillus species which solubilize both potassium and
phosphorus was examined for their influence on growth, yield and nutrient content of maize
plant under green house condition. All the inoculated treatment with bacteria were recorded
maximum dry matter content at 30, 60, and at harvest recorded in isoaltes K-PSB 32 with
rock phosphate and mica were 12.80, 44.2 and 235.7 g/plant, respectively. The yield
components as compared with uninoculated fertilizer control, the isolate K-PSB 50 with rock
phosphate and mica were recorded the heights cob weight 144.9 g/plant and the highest grain
yield 52.93 g/plant and other parameters, followed by isolate K-PSB 32 with rock phosphate
and mica.
From the present study, it was concluded the bacterial isolates K-PSB 50 and K-PSB
32 were efficient K-PSB isolates. They capable to solubilize both K and P from the mineral
source of mica and tricalcium phosphate respectively under in vitro condition. They produced
plant growth promoting substances such as IAA and GA resulting in increased biomass, total
dry matter and cob yield of maize plant.