Bifertilizer play a very significant role in improving soil fertility by fixing atmospheric nitrogen, by in association with plant roots and without it, solubilize insoluble soil phosphate and produces plant growth substance in the soil. They are in fact being promoted to harvest the naturally available biological system of nutrient mobilization Soil-plant-microbe interaction has got much importance in recent decades. Many types of microorganisms are known to inhabit soil, especially rhizosphere and play important role in plant growth and development. Indiscriminate use of synthetic fertilizers has led to the pollution and contamination of the soil, has polluted water basins, destroyed microorganism and friendly insects, making the crop more prone to diseases and reduced fertility. Demand is much higher than the availability. Depleting feedstock/fossil fuels (energy crisis) and increasing of fertilizers. This is becoming unaffordable by small and marginal farmers.

Dr S LALITHA Assistant Professor in Botany Periyar University Salem, India, having 9+ years experience in teaching and 15 years in research. She has 22 publications, 45 conference papers. She is guiding PhD/M.Phil scholars. She has visited KMITL Thailand for special lecture. She has been well trained in plant nutrient technology & waste land devt.