Mode Of Action:
This belongs to bacterial group and the classical example is symbiotic nitrogen fixation. Rhizobium spp., detect compounds like flavinoids secreted by the roots of leguminous plants and then produce nod factors leading to formation of root nodules. The bacteria infect the legume root and form root nodules within which they reduce molecular nitrogen in to ammonia. The site of symbiosis is within the root nodules. It has been estimated that 40 – 50Kg N/ha/year is fixed by different legume crops by the microbial activities of Rhizobium spp.
Benefits To The Crop:
It has been estimated that 40 – 50 kg nitrogen/ha/year is fixed by different legume crops by Rhizobium spp. and improve soil fertility for next crop. Improves the plant growth status, liberation of micro nutrients from insoluble sources, induce systematic disease resistance. Rhizomes determine the nutrient pool for soils and facilitate growth and development of plant.
Leguminous crops like Pea, Pigeon pea, Black gram, Green gram, Chick pea, Cow pea, Soybean, Peanut, Lentil, Berseem etc.