Hirsh & Weil · 2019
How much mineral nitrogen remained in the soil profile at the end of the growing season?
The 29-field survey documented a substantial residual nitrogen stock, but did not test a cover-crop treatment or measure avoided leaching.
1 paper · 29 sampled fields · 2014–2016. Individual field coordinates are unavailable in the reviewed manuscript.
Maryland & southeast PennsylvaniaCoastal Plain sediments; acidic and calcareous rock parent materials · Field-specific irrigation not established in this review
Residual mineral nitrogen
253 kg N ha⁻¹ · SE 23.5
- Treatment
- End-of-season soil inventory, 0–210 cm
- Compared with
- No treatment comparator for this overall mean
- Result applies to
- Mean across all 29 fields
Uncertainty: SE 23.5 kg N ha-1; N = 29 fields
A soil stock, not avoided leaching or a cover-crop treatment effect. It cannot predict nitrogen in a particular field.
Study conditions, methods & original values
Coastal Plain sediments; acidic and calcareous rock parent materials. Field-specific irrigation not established in this review. Mixed crop and manure histories; mostly conservation tillage.
11°C · 1044 mm/year. Regional historical description cited by the paper; not weather measured at each field.
- Experimental design
- Observational field survey
- Measurement method
- Soil coring and mineral-N analysis
- Sampling
- 0–210 cm profile, 2014–2016
- Original reported values
- treatment value: 253value unit: kg N ha-1standard error: 23.5sample size: 29
Use the measured soil profile to frame nitrogen-capture research. A field-specific recommendation still needs local sampling and treatment evidence.
OpenAgData interpretation of this source case.Funding link & study design
- Study design
- Observational sampling of 29 fields; soil cores to 210 cm. Field histories and crops varied.
- Funding connection
- Project LNE14-338. Project attribution verified in both the final report and the paper. This review does not assign exclusive funding credit.
- Original paper
- Deep Soil Cores Reveal Large End-of-Season Residual Mineral Nitrogen Pool
