bga as a component of inm_2

7/31/2019 BGA as a Component of INM_2

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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 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.


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



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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



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bga as a component of inm_2

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