The growth in agricultural production in the last three decades has been accompanied
by a sharp increase in the use of chemical fertilizers, causing serious concern. Foremost among
these concerns is the effect of excessive fertilizers on the quality of soil and ground water. The
use of environmental friendly biofertilizers can cut down the use of chemical fertilizers.
Biofertilizers have definite advantage over chemical fertilizers. It is economical to use
biofertilizers as they are a cheap source of nutrients when compared to chemical fertilizers.
Biofertilisers in addition to nitrogen and phosphorus, also provides certain growth promoting
substances like hormones, vitamins, and amino acids that improves the plant health and vigour.
Continuous use of chemical fertilisers adversely affects the soil structure whereas biofertilizers
when applied to soil improve the soil structure. The chemical fertilizers are toxic at higher doses
where as biofertilizers have no toxic effects.