nstantaneous and historical temperature effects on a-pinene
Role of phosphate solubilizing
bacteria on rock phosphate
solubility and growth of aerobic rice
Author Details
Q.A.Panhwar
Department of Land Management, UniversitiPutraMalaysia, Serdang -
43400, Malaysia
O.Radziah
(Corresponding author)
Department
of Land Management, UniversitiPutraMalaysia, Serdang -
43400, Malaysia
e-mail: radziah@agri.upm.edu.my
A. R.Zaharah
Department of Land Management, UniversitiPutraMalaysia, Serdang -
43400, Malaysia
M.Sariah
Institute of Tropical
Agriculture, UniversitiPutraMalaysia, Serdang -
43400, Malaysia
I. Mohd. Razi
Institute of Tropical
Agriculture, UniversitiPutraMalaysia, Serdang -
43400, Malaysia
Publication Data
Paper received:
10
July 2010
Revised
received:
22
November 2010
Accepted:
20 December 2010
Abstract
Use
of phosphate-solubilizing bacteria (PSB) as
inoculants has concurrently increased phosphorous uptake in plants and
improved yields in several crop species. The ability of PSB to improve growth
of aerobic rice (Oryza sativa L.)
through enhanced phosphorus (P) uptake from Christmas
island rock phosphate (RP) was studied in glasshouse
experiments. Two isolated PSB strains; Bacillusspp.
PSB9 and PSB16, were evaluated with RP treatments at 0, 30 and 60 kg ha-1.
Surface sterilized seeds of aerobic rice were planted in plastic pots
containing 3 kg soil and the effect of treatments
incorporated at planting were observed over 60 days of growth. The
isolated PSB strains (PSB9 and PSB16) solubilized
significantly high amounts of P (20.05-24.08 mg kg-1) compared to
non-inoculated (19-23.10 mg kg-1) treatments. Significantly higher
P solubilization (24.08 mg kg-1) and
plant P uptake (5.31 mg plant -1) was observed with the PSB16
strain at the highest P level of 60 kg ha-1. The higher amounts of
soluble P in the soil solution increased P uptake in plants and resulted in
higher plant biomass (21.48 g plant-1). PSB strains also increased
plant height (80 cm) and improved root morphology in aerobic rice. The
results showed that inoculation of aerobic rice with PSB improved phosphate solubilizing activity of incorporated RP.
Key
words
Aerobic rice, Bacillusspp.,
Christmas island, Rock phosphate (RP),
Inoculation, Phosphate solubilizing bacteria (PSB)
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