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  Section: General Biotechnology / Plant Biotechnology
 
 
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Biofertilizers

 
     
 

Benefits from Biofertilizers

Following are benefits from the biofertilizers :

(i)

It is a low cost and easy technique, and can be used by small and marginal farmers.

(ii)

It is free from pollution hazards and increase soil fertility.

(iii)

On application of algal biofertilizers increase in rice yields ranges between 10-45 per cent and about 40-50 Kg N is left over in the soil which in turn is used for the subsequent crops (Venkataraman, 1972). Moreover, benefits from algalization is about 25-30 Kg N/ ha/cropping season in rice fields (Subba Rao, 1992). After 3-4 consequent years, the algal effects become consistent and there is no need of using this practice. The parental inoculum is sufficient for growth and multiplication.

(iv)

Cyanobacteria secrete growth promoting substances like IAA, IBA, NAA, aminoacids, proteins, vitamins, etc. They add sufficient amount of organic matter in soil.

(v)

Cyanobacteria can grow and multiply under wide pH range of 6.5-8.5. Therefore, they can be used as the possible tool to reclaim saline or alkaline soil because of their ameliorating effect on the physico-chemical properties of the soil.

(vi)

Rhizobial biofertilizer can fix 50-150 kg N/ha/annum.

(vii)

Azotobacter and Azospirillum, besides supplying N to soil, secrete antibiotics which act as pesticides.

 

Content

Bacteria

 

Bacterization

 

Mass cultivation

 

 

Rhizobium

 

 

Azotobactors, azospirillum and phosphate solubilizers

 

Green Manuring

Blue green algae

 

Algalization

 

 

Mass cultivation of blue-green algae

 

Azolla and biofertilizer

 

 

Mass cultivation of Azolla

Mycorrhizae as biofertilizer

 

Mechanism of Symbiosis

 

Types of Mycorrhizas

 

Methods of Inoculum Production and Inoculation

 

Benefits from Mycorrhizas to Plants

Benefits from biofertilizers

Producers of biofertilizers

(viii)

Azolla supplies N, increases organic matter and fertility in soil and shows tolerance against heavy metals.

(ix)

The bioferilizers increase physico-chemical properties of soils such as soil structure, texture, water holding capacity, cation exchange capacity and pH by providing several nutrients and sufficient organic matter.

(x)

The mycorrhizal biofertilizers make the host plants available with certain elements, increase longevity and surface area of roots, reduce plant response to soil stresses, and increase resistance in plants. In general, plant growth, survival and yield are increased.

 
     
 
 
     



     
 
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