Location: Soil Management and Sugarbeet ResearchTitle: Monolith soil core sampling to develop nitrate testing protocol for manure injection
|MEINEN, ROBERT - Pennsylvania State University|
|BEEGLE, DOUGLAS - Pennsylvania State University|
|VISHWANATH, SIDDHARTH - Pennsylvania State University|
|Saporito, Louis - Lou|
|SPARGO, JOHN - Pennsylvania State University|
|KARSTEN, HEATHER - Pennsylvania State University|
|DILLON, JUSTIN - Corteva Agriscience|
Submitted to: Soil Science Society of America Journal
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 11/18/2022
Publication Date: 2/5/2023
Citation: Meinen, R.J., Beegle, D.B., Vishwanath, S., Kleinman, P.J., Saporito, L.S., Spargo, J., Karsten, H., Dillon, J. 2023. Monolith soil core sampling to develop nitrate testing protocol for manure injection. Soil Science Society of America Journal. 87(2):378-389. https://doi.org/10.1002/saj2.20509.
Interpretive Summary: Manure management technologies, such as injection, promise to improve the use of manure in crop production. However, existing nutrient management testing protocols have not kept up with the unique, spatially discrete patterns created by manure injection. Research by scientists from Penn State University and USDA-ARS points to better ways to sampling soil for nitrogen fertilizer recommendations following manure injection.
Technical Abstract: Injecting manure and commercial fertilizer beneath the soil surface is an important nutrient management practice that conserves ammonia-nitrogen (N) but creates distinct bands of N below the soil surface. To date, no widely accepted soil nitrate sampling protocol has been developed to account for the extreme heterogeneity created by injection. To develop sampling recommendations for Pre-Sidedress Nitrate Test (PSNT), we quantified patterns of NO3--N concentrations in soil from of corn (Zea mays L) plots injected with liquid dairy cattle (Bos taurus L) manure at 76 cm spacing over two years. Soil monoliths were collected to allow precise sampling of 30 cm deep by 2.5 cm soil cores from which a mid-season PSNT was determined. Monte Carlo simulation was conducted to simulate the effects of alternative soil sampling protocols on bias and error. Results from the simulation support the following equispaced sampling protocol: five, 30-cm deep soil cores are spaced 15 cm apart and oriented in a line perpendicular to the injected manure bands, collected at four locations in the field, to produce a single composite of 20 samples for NO3- analysis. It is not necessary to know manure band location. As spatially discrete manure application patterns become more prevalent with the expansion of manure injection, we believe this PSNT sampling protocol balances risk of error with practical concerns needed to promote adoption.