Effect of different biofertilizers and inorganic fertilizers on soil health and growth of Eucalyptus clone 413
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Date
2017
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Punjab Agricultural University, Ludhiana
Abstract
A pot experiment was carried out to study the effect of biofertilizers and inorganic fertilizers on
soil health and growth of Eucalyptus clone 413. Significantly higher bacterial population (190 ×
108 CFU/g of soil), PGPR population (86 ×105 CFU/g of soil) and soil dehydrogenase activity
(8.83μg TPF formed/hr/g of soil) was observed in treatment having consortium + N100P100 while
the maximum fungal population (22 ×104 CFU/g of soil) and diazotrophic population (89 ×105
CFU/g of soil) was found in treatments having Azotobacter inoculation. PSB population (48 ×104
CFU/g of soil) and soil alkaline phosphatase activity (3.01 μg pNP formed/ h /g of soil) was
observed to be maxmum in treatment having PSB inoculation. Actinomycetes population and
urease activity showed varying trend as actinomycetes population (48 ×105 CFU/g of soil) was
observed to be significantly higher in control and urease activity (394.6 μg urea hydrolysed/ hr/ g
of soil) in treatment having consortium + N100P100. Soil organic carbon (0.33%) and available N
(171.34 Kg/ha), P (21.0 Kg/ha), K (152.4 Kg/ha) were found to be significantly higher in
treatment having consortium + N100P100. Significantly higher plant N( 1.20 g/plant) and K (0.92
g/plant) uptake was found in treatment having Azotobacter + N100P100 while, plant P uptake(0.22
g/plant) was highest in treatment having consortium + N100P100. Plant growth parameters viz root
shoot biomass, leaves, branches and root shoot length were found to be significantly higher in
treatment having Azotobacter + N100P100while, collar diameter was found to be highest in
consortium + N100P100. The present study was also done by using two cultures of Glomus
fasiculatum as AM1 and AM2. Significantly higher bacterial population (138 × 108 CFU/g of soil),
PSB population (86 ×105 CFU/g of soil), diazotrophic population(58 ×105 CFU/g of soil), soil
dehydrogenase activity (7.67 μg TPF formed/hr/g of soil) and alkaline phosphatase activity (3.01
μg pNP formed/ h /g of soil) were observed in treatment having AM1 and inorganic fertilizer
combinations while, the maximum fungal population (24 ×104 CFU/g of soil) and PGPR
population (64 ×105 CFU/g of soil) was found in treatments having AM2 and inorganic fertilizer
combinations. Actinomycetes population and urease activity showed varying trend and urease
activity (367.7 μg urea hydrolysed/ hr/ g of soil) in treatment having AM2 + N-100% P-100%. Soil
organic carbon (0.33%), available K (144.7 Kg/ha) and plant K uptake (0.83 g/plant) were found
to be significantly higher in treatment having AM2 and inorganic fertilizers combinations while
significantly higher available N (162.9 Kg/ha), available P (18.6 Kg/ha), plant N (0.92 g/plant)
and plant P (0.14 g/plant) uptake were found in treatment having AM1 and inorganic fertilizer
combinations.. Plant growth parameters viz root shoot biomass, leaves, branches and collar
diameter were found to be significantly higher in treatment having AM2 and inorganic fertilizer
combinations while, root and shoot length was found to be highest in AM1 and inorganic fertilizer
combinations. Hence the combined effect of biofertilizers and inorganic fertilizers boost the soil
health and growth parameters of Eucalyptus.
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