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INTRODUCTION
Besides fixing nitrogen, these algae excrete
vitamins and hormones, which may also
contribute to the growth of rice plants.
BLUE GREEN ALGAE AS COMPONENT OF INM
Cyanobacteria (BGA) can be found in
almost every conceivable environment.
Blue green algae are photosynthetic
Cyanobacteria and promote the growth oflowland paddy by supplying fixed nitrogen
through exudation.
BGA application @ 10 kg/ha one week after
rice transplantation contribute 25 - 30 kg N /ha
/season with a yield enhancement of 10-15percent.
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BLUE GREEN ALGAE AS COMPONENT OF INM
Blue green algae found in almost every environment,from oceans to fresh water to bare rock to soil. They
occur as plantonic cells or form phototrophicbiofilm in marine environments, in damp soil,
moistened rocks ,deserts
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Blue green algae excrete vitamins and
hormones, which enhance rice growth. BGA
also enhances soil fertility
Blue green algae are photosynthetic .Cyanobacteria ,promote the growth of lowland
paddy by supplying nitrogen.
BGA strains used for biofertilizer are
Anabaena variabilis ,Nostoc muscorum,
Aulosira fertilissimaand Tolypothrix tenuis.
BLUE GREEN ALGAE AS COMPONENT OF INM
BGA application @ 10 kg/ha one week after
rice transplantation contribute 25 - 30 kg N
/ha /season with a yield increase of 10-15
percent.
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Cyanobacteria include unicellular and colonial form.Colonies form filaments, sheets , hollow balls.
Filaments differentiate into vegetative cells,heterocysts and resistant spores.
Heterocyst is the site of nitrogen fixation .
Heterocyst fix nitrogen into ammonia and nitrateNitrate and ammonia are absorbed by plants.
CHARACTERISTICS OF BLUE GREEN ALGAE
BLUE GREEN ALGAE AS COMPONENT OF INM
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Blue Green Algal Species
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ALGALIZATION EFFECT ON PADDY
Treatment Grain yield (q/ha)2000 2001 2002
Control 34.27 39.64 45.6140 kg N/ha 46.50 42.58 50.7380 kg N/ha 50.67 45.84 53.80120 kg N/ha 53.10 47.84 55.30BGA 43.70 40.17 48.60BGA + 40 kg N/ha 51.57 48.04 52.70BGA + 80 kg N/ha 54.70 51.06 55.80BGA + 120 kg N/ha - 51.42 56.70
BGA SUPPLEMENT NITROGENIN ACHIEVING YIELD
EQUIVALENT TO MINERALNITROGEN ALONE
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Fix
atmosphericnitrogen
Contribute25- 30 kg N/ha /season
BLUEGREENALGAE
Increase riceyield by10-15 %
SecreteVitamins &
hormones
BLUE GREEN ALGAE
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MASS PRODUCTION OF BGA CULTURE
Shallow trays (2m x1m) of galvanizedsheet
Spread 8-10 kg soilplus 200 g SSP
Add water (5-15cm)
Sprinkle algal culture
Expose to sunlight
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MASS PRODUCTION OF BGA CULTURE
Thick algal mat formsat 15 days
Allow water to
evaporate
Collect dry algalflakes
Make into powder andpack in polybags
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LET US SUM UP
Blue green algae are photosynthetic .
They form phototrophic biofilm in
fresh water and marine
environments, in damp soil.Promote the growth of lowland
paddy by supplying fixed nitrogen
through exudation.
Blue green algae also excrete vitamins andhormones, which may also contribute to the
growth of rice plants.
contd
BLUE GREEN ALGAE AS COMPONENT OF INM
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