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MICROBIAL POPULATION DYNAMICS IN VERMICOMPOST ENRICHED WITH BIOFERTILIZERS AND THEIR EFFECT ON BLACK GRAM

KrishiKosh

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Title MICROBIAL POPULATION DYNAMICS IN VERMICOMPOST ENRICHED WITH BIOFERTILIZERS AND THEIR EFFECT ON BLACK GRAM
 
Creator HARISH KUMAR, MEHTA
 
Contributor SUBHASH REDDY, R
 
Subject vermicomposting, bacteria, rhizobium, biofertilizers, application methods, yields, planting, vegetables, nitrogen, sowing
 
Description The experiment was conducted during 2011-12 at college farm, Department of
Agricultural Microbiology and Bioenergy, and Department of Soil Science & Agricultural
Chemistry, College of Agriculture, Rajendranagar, ANGRAU, Hyderabad.
Viable counts of microbes (Bacteria, Fungi, Actinomycetes, Rhizobia and
Pseudomonas) and chemical properties (pH, Electrical conductivity, Organic carbon,
Nitrogen, Phosphorous and Potassium content) of different vermicomposts were analysed
by using standard procedures. Pure cow dung vermicompost recorded significantly higher
viable counts of bacteria, fungi, actinomycetes, rhizobia and Pseudomonas and higher value
of electrical conductivity, organic carbon, nitrogen, phosphorous and potassium content
among all the vermicomposts, but C: N ratio recorded significantly lowest.
One kg of unsterilized and one kg of sterilized commercial vermicompost were
enriched using biofertilizers viz., Rhizobium, Pseudomonas @ 200 g each, separately in the
standard size (30×20×5 cm) trays in eight treatments with three replications in completely
randomized design. The different treatments in the experiment were T1 - Unsterilized
vermicompost, T2-Unsterilized vermicompost + Rhizobium, T3.-Unsterilized
vermicompost + Pseudomonas, T4- Unsterilized vermicompost +Rhizobium +
Pseudomonas, T5- Sterilized vermicompost, T6- Sterilized vermicompost + Rhizobium,
T7- Sterilized vermicompost + Pseudomonas, T8-Sterilized vermicompost +Rhizobium +
Pseudomonas. Change in viable counts of bacteria, fungi, actinomycetes, rhizobia &
Pseudomonas and available nutrient status (Nitrogen, Phosphorous and Potassium content)
in the vermicompost enriched with biofertilizers , were analysed by using standard
procedures at initial, 1st ,2nd ,5th and 15th day of storage period. Bacterial, fungal,
actinomycetes, rhizobial and Pseudomonas population were increased slightly in the
unsterilized vermicompost not enriched with biofertilizers up to 15th day of storage but not
significantly. In the unsterilized and sterilized vermicompost enriched with Rhizobium and
Pseudomonas biofertilizers singly as well as with combination of Rhizobium +
Pseudomonas biofertilizer, the bacterial population increased significantly up to 15th day of
storage. The fugal and actinomycetes population slightly increased in the unsterilized
vermicompost with enrichment with Rhizobium biofertilizer up to 15th day of storage period
but increase was not significant. Population of rhizobia in the unsterilized and sterilized
vermicompost enriched with Rhizobium biofertilizer and Rhizobium + Pseudomonas
biofertilizers increased significantly up to 15th day of storage. Population of Pseudomonas
in the unsterilized and sterilized vermicompost enriched with Pseudomonas biofertilizer
and Rhizobium + Pseudomonas biofertilizers increased significantly up to 15th day of
storage. There was no significant increase in nitrogen, phosphorus and potassium content in
the vermicompost (unsterilized and sterilized) not enriched with any biofertilizer during
storage period from 0 to 15 day. In the unsterilized and sterilized vermicompost inoculated
with Rhizobium + Pseudomonas showed significant increase in the nitrogen, phosphorus
and phosphorus content up to 15th day of storage. In the unsterilized and sterilized
vermicompost inoculated with Rhizobium and Pseudomonas separately showed significant
increase in the nitrogen and phosphorus content respectively up to 15th day of storage.
The field experiment was conducted following randomized block design with 11
treatments and three replications. Treatment consisted of T1-100%RDF, T2-100%RDF+
Rhizobium + Pseudomonas, T3-Vermicompost, T4-Vermicompost + Rhizobium, T5-
Vermicompost + Pseudomonas, T6-Vermicompost + Rhizobium + Pseudomonas, T7-
50%RDF, T8-50%RDF+ Rhizobium + Pseudomonas, T9-50%RDF + Vermicompost +
Rhizobium, T10-50%RDF + Vermicompost + Pseudomonas and T11-50%RDF +
Vermicompost + Rhizobium + Pseudomonas. The growth parameters viz., plant height,
root length, leaf area index, chlorophyll content, nodule no. plant-1, nodule wt. (g plant-1),
dry matter accumulation (g plant-1), were recorded at different crop growth stages. Likewise
observation on yield attributes viz., number of seeds pod-1, weight of 100 Seeds, seed yield
and haulm yield were taken at harvest.The net return and benefit: cost ratio was calculated
and presented. The protein % in seed, nutrient uptake, microbial population and available
soil nitrogen, phosphorus and potassium were estimated at harvest stage.
At 25 DAS and 50 DAS treatment 50 % RDF + Vermicompost + Rhizobium +
Pseudomonas (T11) recorded significantly higher plant height, root length, leaf area index
and spad meter value as compared to all other treatments. Treatment 50%RDF +
Vermicompost + Rhizobium + Pseudomonas (T11) recorded significantly higher number of
root nodule and nodule dry weight (at flowering stage), total dry matter production and
seed protein content (at harvest stage) as compared to all other treatments. The combined
application of 50 % RDF, vermicompost and biofertilizers were recorded highest yield
contributing characters, seed and haulm yield as compared to the all other treatments and
control. Significantly high nitrogen, phosphorus and potassium uptake as well as available
nitrogen, phosphorus and potassium content in the soil were observed with the combined
inoculation of Rhizobium + Pseudomonas along with 50% RDF and vermicompost which
was significantly higher than single inoculation with Rhizobium, Pseudomonas along with
100% RDF or 50% RDF or vermicompost. At harvest stage treatment supplied with
50%RDF + Vermicompost + Rhizobium + Pseudomonas recorded significantly higher
bacterial, fungal, actinomycetes, Rhizobium and Pseudomonas population as compared to
the other treatments Treatment supplied with 50%RDF + Vermicompost + Rhizobium +
Pseudomonas recorded highest gross return and net return but highest B: C ratio was
recorded in the treatment supplied with 50%RDF + Rhizobium + Pseudomonas. The lowest
net return and B: C ratio of the black gram was recorded in the treatment supplied with
Vermicompost alone.
 
Date 2016-06-16T14:26:38Z
2016-06-16T14:26:38Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67466
 
Language en
 
Relation D9126;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY