Seagrass meadows are highly productive systems with an important function as a biogeochemical filter between terrestrial and marine systems. High anthropogenic nutrient enrichment is often linked to seagrass degradation yet the effects of moderate enrichment on the nitrogen cycling of seagrass ecosystems is understudied. Comparisons between seagrass meadows show that nutrient poor systems are dominated by nutrient conserving pathways, like dissimilatory nitrate reduction to ammonium (DNRA), while nutrient rich systems are dominated by nutrient removing pathways, like denitrification. Denitrification often forms the greenhouse gas N2O as a by-product making a switch from DNRA extra relevant. Here I describe an experimental design using small seagrass patches, in situ, to determine how nutrient enrichment impacts N cycling in seagrass ecosystems. Rate of DNRA and denitrification will be compared in seagrass beds with and without added nutrients using the isotope pairing technique. Investigation of the changes to the N-pathways will increase our understanding of the effect of nutrient enrichment on a seagrass meadow. While a change in the dominant N-pathway is not as dramatic as the degradation or loss of seagrass, it can have significant consequences for the greenhouse gas emissions and nutrient storage capacity of seagrass meadows.