Present Situation Concerning Studies on Associative N-Fixation in Sugarcane, 'Saccharum Officinarum' L

摘要

High nitrogenase activity in sugarcane has been confirmed, using exp 15 N procedure, which indicated rapid translocation of the fixed nitrogen to the plant tissue. It is observed that there are differences in variety concerning nitrogenase activity in the rhizosphere of sugarcane. Basic calculations and an evaluation of possible biological N-fixation with exp 15 N suggest that possibly as much as 25-30% of the plant nitrogen may be derived from biological fixation. Both eight and electron microscope studies suggest that there are bacteria inside healthy roots and if such a root is surface sterilized and placed ou nitrogen-free media then bacteria stream from the cut surface. (Atomindex citation 09:414594)