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Bioavailability of macro‐ and micro‐nutrients chemically extracted in acidic soils for wheat
Author(s) -
García-Marco Sonia,
Abadín Josefa,
Couto-Vázquez Alejandra,
Martín Àngela,
González-Prieto Serafín J.
Publication year - 2020
Publication title -
journal of plant nutrition and soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 1436-8730
DOI - 10.1002/jpln.201900590
Subject(s) - chemistry , bioavailability , ammonium acetate , soil water , ammonium bicarbonate , nutrient , ammonium , environmental chemistry , bicarbonate , extraction (chemistry) , chelation , agronomy , inorganic chemistry , chromatography , soil science , biology , environmental science , raw material , bioinformatics , high performance liquid chromatography , organic chemistry
Background: Chemical methods allowing a single soil extraction followed by multi‐elemental simultaneous measurement by ICP‐OES are increasingly used to predict plant uptake; however, calibration results against crop response are scarce and contradictory. Aims: Our aims were to evaluate the efficacy of five extractants to predict nutrient uptake by a greenhouse wheat crop, as well as the influence of soil properties on nutrient concentrations in soil extracts and wheat plants. Methods: Unlike other calibration studies, we monitored the pre‐seeding to post‐harvesting changes in soil available Ca, K, Mg, Cu, Fe, Mn, Zn, and Al. We extracted 14 acidic soils (C content: 47–114 g kg −1 ) with two traditional (AA: ammonium acetate; DTPA: diethylenetriamine‐pentaacetic acid) and three multi‐element extractants (AB‐DTPA: ammonium bicarbonate‐DTPA; Mehlich‐3; AA‐DTPA: ammonium acetate‐DTPA). Results: Relationships between bioavailable and chemically extractable elements were strong for K ( R 2 = 0.776 to R 2 = 0.882; p < 0.001) and Zn ( R 2 = 0.663 to R 2 = 0.721; p < 0.001), especially for AB‐DTPA and AA‐DTPA. Multiple regressions including also soil properties can predict wheat‐Ca (Fe oxihydroxides , clay and Ca AB‐DTPA ; R 2 = 0.656; p < 0.001) and wheat‐Cu [Al oxihydroxides and either Cu AB‐DTPA ( R 2 = 0.515; p < 0.01) or Cu AA‐DTPA ( R 2 = 0.472; p < 0.01)]. Pre‐seeding to post‐harvesting changes in K AA‐DTPA and K AB‐DTPA were strongly related with K uptake by wheat ( R 2 = 0.927 and R 2 = 0.949, respectively; p < 0.001); similarly, for wheat‐Zn the best relationships were with Zn Mehlich‐3 and Zn AA‐DTPA ( R 2 = 0.654 and R 2 = 0.757, respectively; p < 0.001). Conclusion: Consequently, chemical extractants alone can adequately predict K and Zn bio‐availability, and combined with some soil properties can predict wheat uptake of Ca and Cu, but not that of other nutrients.