DIAGNOSIS OF NUTRITIONAL CONSTRAINTS OF AZOLLA SPP. TO ENHANCE THEIR GROWTH UNDER FLOODED CONDITIONS OF SALT AFFECTED SOILS

A green house experiment was conducted to know the nutritional constraints of Azolla for enhancing its growth under flooded conditions and select the best ones for its use as biofertilizer in rice-wheat cropping system. Among the tested nutrients viz; phosphorus, iron and zinc, phosphorus was found to be the major limiting nutrient for plant growth. A. pinnata var. pinnata and hybrid Azolla Rong Ping gave better growth, hence can be used as biofertilizer in rice-wheat cropping system.