| incorporation of different n sources and light response curves of nitrogenase and photosynthesis by cyanobacterial blooms from rice fields. | in this work, we estimate the contributions of the different sources of n incorporated by two n(2)-fixing cyanobacterial blooms (anabaena sp. and microchaete sp.) in the rice fields of valencia (spain) during the crop cycles of 1999 and 2000, and evaluate the response of nitrogenase and c assimilation activities to changing irradiances. our results show that, far from the generally assumed idea that the largest part of the n incorporated by n(2)-fixing cyanobacterial blooms in rice fields comes ... | 2006 | 16596437 |