Isotopic Studies of Azolla and Nitrogen Fertilization of Rice ILO guidance and support van Oystaeyen guidance and support They follow a strict chapter format which includes keywords The consultants' group recommended that the Joint FAI IAEA Division of Nuclear Techniques in Food and Agriculture embark on a coordinated research programme in this field and that initial emphasis should be placed on Azolla Anabaena symbiosis Our increased interest in biological nitrogen fixation as a supplement or alternative to nitrogen fertilizers led to the convening of a consultants' meeting on `The Role of Isotopes in Studies on Nitrogen Fixation and Nitrogen Cycling by Blue Green Algae and the A zolla Anabaena azollae Association'