Soil nutrient studies

Soil nutrient studies have been conducted for agronomic and environmental purposes, in three regions of British Columbia: Hullcar Valley (annually from 2016-2021), the Lower Fraser Valley (2012 and 2005), and the Okanagan-Similkameen Valley (2007).

2021 Soil Nitrate Study: Hullcar Valley


  • Monitoring the year-to-year trends of post-harvest soil nitrate is useful for improving the efficiency of nitrogen use
  • In the fall of 2021, soil sampling to a 90-cm depth was completed on 50 fields lying above Aquifer 103 in the Hullcar Valley of the North Okanagan
  • The area-weighted average soil nitrate value for the entire sampling area in 2021 was greater than in 2020 (99 and 72 kg NO3-N ha-1, respectively), as was the median soil nitrate value for the overall sampling area (82 and 73 kg NO3-N ha-1 for 2021 and 2020, respectively).
  • Among the fields sampled, 58% of the nitrate in the sampled 90 cm of soil was found in the 0-30 cm layer on average, while 23% and 19% was found in the 30-60 and 60-90 cm layers, respectively.

Read the Final Report:

Past reports:

Raw data:

Previous Studies

2012 Fraser Valley Soil Nutrient Survey - Results by Crop Group: