Title | Phosphorus in Morgan Soil Test Extracts Measured By Molybdate Colorimetric and Inductively Coupled Plasma Spectroscopy Methods |
Publication Type | Journal Article |
Year of Publication | 2017 |
Authors | Young, EO, Ross, DS, Hoskins, BR |
Journal | Communications in Soil Science and Plant Analysis |
Volume | 48 |
Start Page | 2434 |
Issue | 20 |
Pagination | 2434 - 2446 |
Date Published | 2017/12 |
ISSN | 0010-3624 |
Keywords | Inductively coupled plasma, Morgan soil test, phosphorus |
Abstract | Colorimetric P determination mainly reflects inorganic P, whereas inductively coupled plasma spectroscopy (ICP) measures all P in solution. We compared Morgan extractable P for ICP (MP-ICP) and colorimetry (MP-Color) using dairy farm field samples (0 to 20 cm) across northern New York (n = 250) and hayfield transect samples (0–15, 15–30, 45–50 cm; n = 164). Soil organic matter, pH, and extractable cations were also measured. Mean ratio of MP-ICP: MP-Color was 1.46 and differed significantly among Morgan P categories, ranging from 1.89 for low to 1.06 for very high. The numeric difference between MP-ICP and MP-Color ranged from 0 to 12.9 mg kg−1. Organic matter, Al, and pH jointly accounted for 55% of the variability between methods across samples. Fertilizer P recommendations differed based on the two methods, suggesting results from both methods should be reported, particularly in the responsive range. |
URL | http://www.tandfonline.com/doi/abs/10.1080/00103624.2017.1411936 |
DOI | 10.1080/00103624.2017.1411936 |
Short Title | Communications in Soil Science and Plant Analysis |
Refereed Designation | Refereed |
Phosphorus in Morgan Soil Test Extracts Measured By Molybdate Colorimetric and Inductively Coupled Plasma Spectroscopy Methods
Status:
Published
Attributable Grant:
BREE
Grant Year:
Year2
Acknowledged VT EPSCoR:
Ack-No