Do different agronomic soil tests identify similar nutrient deficiencies?

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Mattila , T J & Rajala , J 2022 , ' Do different agronomic soil tests identify similar nutrient deficiencies? ' , Soil Use and Management , vol. 38 , no. 1 , pp. 635-648 . https://doi.org/10.1111/sum.12738

Title: Do different agronomic soil tests identify similar nutrient deficiencies?
Author: Mattila, Tuomas J.; Rajala, Jukka
Contributor organization: Ruralia Institute, Mikkeli
Ruralia Institute
Date: 2022-01
Language: eng
Number of pages: 14
Belongs to series: Soil Use and Management
ISSN: 0266-0032
DOI: https://doi.org/10.1111/sum.12738
URI: http://hdl.handle.net/10138/346063
Abstract: Traditionally, locally calibrated soil tests were used for fertilizer and lime recommendations. Farmers and advisors are increasingly using new 'universal' soil tests without local calibration. The objective of this study was to compare five commercially available soil tests and to determine whether they would provide similar recommendations. In total, 24 fields in Western Finland were sampled for 4 years while being treated with fertilizers, lime and manure. The soil samples were analysed with Mehlich-3, ammonium acetate, H3A, hydrochloric acid and mild acetic acid (Spurway) extractants. In addition, Soil Health Tool (CO2 burst, water-soluble C and N) and tissue testing were conducted. The different tests extracted different orders of magnitude of nutrients (especially P and Mg), but the results from the different extractions were correlated. Mehlich-3 degree of phosphorus saturation (DPS) presented a threshold, below which soluble phosphorus was not detected. Similar thresholds were found for P, S and Mg. Mehlich-3 and ammonium acetate provided similar results for Ca, Mg and K and can be used interchangeably for liming recommendations. Mehlich-3 identified more fields with Zn, Cu, B and S deficiencies and less fields with Mn deficiencies compared with ammonium acetate + EDTA and tissue testing. The tests had strong correlation, but the determination of nutrient deficiencies needs local calibration of deficiency limits.
Subject: chemical extraction
fertilization
soil health
MEHLICH 3
AGRICULTURAL SOILS
WATER EXTRACTION
GYPSUM TREATMENT
PHOSPHORUS
BORON
FERTILIZATION
AMMONIUM
SULFUR
PLANTS
4111 Agronomy
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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