Biological fixation — Cropland nitrogen per unit area in Sierra Leone
Sierra Leone: Biological fixation — Cropland nitrogen per unit area was 21.23 kg/ha in 2023. ▼ Falling
Biological fixation — Cropland nitrogen per unit area in Sierra Leone, 1961–2023
Source: Food and Agriculture Organization of the United Nations. Measured in kg/ha.
Analysis
Sierra Leone recorded 21.23 kg/ha for biological fixation — cropland nitrogen per unit area in 2023.
That represents a change of up 16.3% on the previous year and up 19.7% over ten years.
Over the whole period, biological fixation — cropland nitrogen per unit area in Sierra Leone peaked at 29.24 kg/ha in 1967 and was at its lowest, 15.37 kg/ha, in 2020.
That places Sierra Leone 22nd out of 176 countries with data for 2023, putting it in the top quarter.
The long-run direction has been consistently falling across the 63 years of available data.
Biological fixation — Cropland nitrogen per unit area in Sierra Leone, year by year
| Year | kg/ha | Change |
|---|---|---|
| 1961 | 27.6 kg/ha | — |
| 1962 | 25.6 kg/ha | -7.3% |
| 1963 | 25.64 kg/ha | +0.2% |
| 1964 | 25.64 kg/ha | +0.0% |
| 1965 | 27.1 kg/ha | +5.7% |
| 1966 | 27.53 kg/ha | +1.6% |
| 1967 | 29.24 kg/ha | +6.2% |
| 1968 | 26.86 kg/ha | -8.1% |
| 1969 | 26.5 kg/ha | -1.3% |
| 1970 | 26.55 kg/ha | +0.2% |
| 1971 | 27.41 kg/ha | +3.2% |
| 1972 | 26.29 kg/ha | -4.1% |
| 1973 | 26.19 kg/ha | -0.4% |
| 1974 | 27.14 kg/ha | +3.6% |
| 1975 | 27.49 kg/ha | +1.3% |
| 1976 | 28.39 kg/ha | +3.3% |
| 1977 | 28.96 kg/ha | +2.0% |
| 1978 | 29.07 kg/ha | +0.4% |
| 1979 | 27.2 kg/ha | -6.4% |
| 1980 | 27.13 kg/ha | -0.3% |
| 1981 | 27.11 kg/ha | -0.1% |
| 1982 | 26.31 kg/ha | -2.9% |
| 1983 | 24.42 kg/ha | -7.2% |
| 1984 | 22.24 kg/ha | -8.9% |
| 1985 | 21.42 kg/ha | -3.7% |
| 1986 | 22.05 kg/ha | +2.9% |
| 1987 | 22.34 kg/ha | +1.3% |
| 1988 | 23.57 kg/ha | +5.5% |
| 1989 | 24.53 kg/ha | +4.1% |
| 1990 | 24.24 kg/ha | -1.2% |
| 1991 | 23.78 kg/ha | -1.9% |
| 1992 | 23.08 kg/ha | -2.9% |
| 1993 | 24 kg/ha | +4.0% |
| 1994 | 24.33 kg/ha | +1.4% |
| 1995 | 21.61 kg/ha | -11.2% |
| 1996 | 23.19 kg/ha | +7.3% |
| 1997 | 24.99 kg/ha | +7.8% |
| 1998 | 24.06 kg/ha | -3.7% |
| 1999 | 21.13 kg/ha | -12.2% |
| 2000 | 16.07 kg/ha | -23.9% |
| 2001 | 17.89 kg/ha | +11.3% |
| 2002 | 20.28 kg/ha | +13.4% |
| 2003 | 17.1 kg/ha | -15.7% |
| 2004 | 18.1 kg/ha | +5.9% |
| 2005 | 20.42 kg/ha | +12.8% |
| 2006 | 19.93 kg/ha | -2.4% |
| 2007 | 16.53 kg/ha | -17.1% |
| 2008 | 16.52 kg/ha | -0.0% |
| 2009 | 16.84 kg/ha | +2.0% |
| 2010 | 16.58 kg/ha | -1.6% |
| 2011 | 16.79 kg/ha | +1.3% |
| 2012 | 20.25 kg/ha | +20.6% |
| 2013 | 17.74 kg/ha | -12.4% |
| 2014 | 18.7 kg/ha | +5.4% |
| 2015 | 16.2 kg/ha | -13.4% |
| 2016 | 16.52 kg/ha | +2.0% |
| 2017 | 16.74 kg/ha | +1.4% |
| 2018 | 22.34 kg/ha | +33.4% |
| 2019 | 16.35 kg/ha | -26.8% |
| 2020 | 15.37 kg/ha | -6.0% |
| 2021 | 22.52 kg/ha | +46.5% |
| 2022 | 18.25 kg/ha | -18.9% |
| 2023 | 21.23 kg/ha | +16.3% |
Sierra Leone compared with similar countries
- Sierra Leone's 21.23 kg/ha is above the median for low income countries, which is 12.63 kg/ha, 1.7× the median. (21 countries reporting)
- Sierra Leone's 21.23 kg/ha is above the median for Sub-Saharan Africa, which is 12.23 kg/ha, 1.7× the median. (40 countries reporting)
Biggest year-on-year movements
Years where Biological fixation — Cropland nitrogen per unit area in Sierra Leone changed far more than this series normally does. A large move can be a real event or a change in how the figure was measured — the source note below says who published it.
| Year | Change | From | To |
|---|---|---|---|
| 2021 | +46.5% | 15.37 kg/ha | 22.52 kg/ha |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1960s | 26.86 kg/ha | 25.6 kg/ha | 29.24 kg/ha | 9 |
| 1970s | 27.47 kg/ha | 26.19 kg/ha | 29.07 kg/ha | 10 |
| 1980s | 24.11 kg/ha | 21.42 kg/ha | 27.13 kg/ha | 10 |
| 1990s | 23.44 kg/ha | 21.13 kg/ha | 24.99 kg/ha | 10 |
| 2000s | 17.97 kg/ha | 16.07 kg/ha | 20.42 kg/ha | 10 |
| 2010s | 17.82 kg/ha | 16.2 kg/ha | 22.34 kg/ha | 10 |
| 2020s | 19.34 kg/ha | 15.37 kg/ha | 22.52 kg/ha | 4 |
Countries ranked near Sierra Leone
More environment data for Sierra Leone
- Historical exposure to drought — Land soil moisture anomaly -5.4 Percentage change (2025)
- Historical exposure to drought — Cropland soil moisture anomaly -5.39 Percentage change (2025)
- Standard Deviation, annual growth rate 0 % change on previous year (2025)
- Standard Deviation 0.232 °C (2025)
- Temperature change 1.28 °C (2025)
- Total greenhouse gas emissions excluding LULUCF (Mt CO2e), annual 1.72 % change on previous year (2024)
- Total greenhouse gas emissions excluding LULUCF (Mt CO2e), per unit 0 Mt CO2e per US$ of GDP (2024)
- Total greenhouse gas emissions excluding LULUCF (Mt CO2e), per capita 0 Mt CO2e per person (2024)
- Methane (CH4) emissions from Agriculture (Mt CO2e), annual growth rate 1.11 % change on previous year (2024)
- Methane (CH4) emissions from Agriculture (Mt CO2e), per unit of GDP 0 Mt CO2e per US$ of GDP (2024)
Frequently asked questions
- What is biological fixation — cropland nitrogen per unit area in Sierra Leone?
- Biological fixation — cropland nitrogen per unit area in Sierra Leone was 21.23 kg/ha in 2023, according to Food and Agriculture Organization of the United Nations.
- What is the highest biological fixation — cropland nitrogen per unit area recorded in Sierra Leone?
- The highest recorded value was 29.24 kg/ha in 1967.
- What is the lowest biological fixation — cropland nitrogen per unit area recorded in Sierra Leone?
- The lowest recorded value was 15.37 kg/ha in 2020.
- How does Sierra Leone rank for biological fixation — cropland nitrogen per unit area?
- Sierra Leone ranks 22nd out of 176 countries with data for 2023.
- Is biological fixation — cropland nitrogen per unit area rising or falling in Sierra Leone?
- Over the last ten years it is up 19.7%. The long-run trend across the full record is falling.
- Where does this Sierra Leone data come from?
- The figures come from Food and Agriculture Organization of the United Nations, published as part of Biological fixation — Cropland nitrogen per unit area. Statizoid updates them automatically from the source API.
Download this data
CSV · JSON — 63 observations, free to reuse under CC BY-NC-SA 3.0 IGO (FAO).
About this data
The Cropland Nutrient balance domain contains information on the flows of nitrogen, phosphorus, and potassium from mineral fertilizer, manure applied, atmospheric deposition, crop removal, and biological fixation over cropland and per unit area of cropland. The flows are aggregated to total inputs and total outputs, from which the overall nutrient balance and nutrient use efficiency on cropland are calculated. Statistics are disseminated in units of tonnes and in kg/ha, as appropriate. Nutrient use efficiency is expressed as a fraction (%).