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| English | Spanish |
| biological nitrogen fixation | fijación biológica del nitrógeno |
| nitrogen fixation | fijación del nitrógeno |
| nitrogen fixation | fijación de nitrogeno |
| nitrogen fixation Assimilation of atmospheric nitrogen by a variety of microorganisms which live freely in soil. Once the nitrogen has been captured by one of the microorganisms, there are many different routes by which it is handled. Some is retained in the soil as decomposing plant matter, waiting to be released and taken up by new crops as a nitrate. That nitrate is produced by nitrifying bacteria living in the soil that thrive on ammonia, which is produced by decaying plant and animal material. In processing nitrogen the nitrifying bacteria produce nitrate that can be absorbed by the roots of plants | fijación de nitrogeno |
| sand dune fixation | estabilización de dunas |
| sand dune fixation Stabilization of dunes effected by the planting of marram grass (Ammophila arenaria), or rice grass, whose long roots bind the surface layers of sand and so hinder its removal by wind. A larger scale method of dealing with the same problem is by afforestation | estabilización de dunas |
| total fixation of chromium salts in skins | fijación total de las sales de cromo en las pieles |