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| Ecology Ecosystem Effective Humus Emulsifier Or Emulsifying Agent Enzyme Equivalent Weight Or Combining Weight Erosion Evapo-Transpiration Extraction |
| P.E.T. (Potential Evapo-Transpiration) expressed in mm of water by week or month: it is a meteorologic data which includes water losses due to the climate, losses from soil evaporation and plants transpiration. |