What is net assimilation rate?

Net assimilation rate (NAR) is a measure used in ecology and agriculture to quantify the efficiency of a plant in converting photosynthetically active biomass into growth. It is defined as the increase in plant biomass over a specific period, adjusted for the biomass that is lost due to respiration. NAR is typically expressed in terms of grams of dry weight per square meter per day, providing insights into plant health and productivity. This metric helps in understanding how effectively a plant utilizes resources for growth under various environmental conditions.