American Samoa

Definition (source: Our World in Data): Fertilizer consumption measures the quantity of plant nutrients used per unit of arable land. Fertilizer products cover nitrogenous, potash, and phosphate fertilizers (including ground rock phosphate). Traditional nutrients--animal and plant manures--are not included. For the purpose of data dissemination, FAO has adopted the concept of a calendar year (January to December). Some countries compile fertilizer data on a calendar year basis, while others are on a split-year basis. Arable land includes land defined by the FAO as land under temporary crops (double-cropped areas are counted once), temporary meadows for mowing or for pasture, land under market or kitchen gardens, and land temporarily fallow. Land abandoned as a result of shifting cultivation is excluded. Note: Where data for 2023 is unavailable, the value from the closest year between 2020 and 2022 is shown instead.

Definition (source: Our World in Data): Nitrogen use efficiency (NUE) is the ratio between nitrogen inputs and output. A NUE of 40% means that only 40% of nitrogen inputs are converted into nitrogen in the form of crops. The remaining 60% is lost to the environment as a pollutant. The data of this indicator is based on the following sources: Lassaletta et al. – 50 year trends in nitrogen use efficiency of world cropping systems: the relationship between yield and nitrogen input to cropland This dataset measures the nitrogen balance of agricultural inputs and outputs. Nitrogen inputs are measured as the application of nitrogen to crops either from synthetic fertilizers, or organic sources such as manure. Nitrogen output is measured as the nitrogen produced in the form of crops.

Definition (source: The World Bank): A measure of annual emissions of nitrous oxide (N₂O), one of the six Kyoto greenhouse gases (GHG), from the agricultural sector. This includes emissions from livestock (IPCC 2006 codes 3.A.1 – enteric fermentation, 3.A.2 – manure management) and crops (IPCC 2006 codes 3.C.1 – emissions from biomass burning, 3.C.2 – liming, 3.C.3 – urea application, 3.C.4 – direct N₂O emissions from managed soils, 3.C.5 – indirect N₂O emissions from managed soils, 3.C.6 – indirect N₂O emissions from manure management, 3.C.7 – rice cultivation). The measure is standardized to carbon dioxide equivalent values using the Global Warming Potential (GWP) factors of IPCC's 5th Assessment Report (AR5).