Interactions between cover crops and soil microorganisms increase phosphorus availability in conservation agriculture

Hallama, Moritz; Pekrun, Carola; Pilz, Stefan; Jarosch, Klaus A.; Frąc, Magdalena; Uksa, Marie; Marhan, Sven; Kandeler, Ellen (2021). Interactions between cover crops and soil microorganisms increase phosphorus availability in conservation agriculture. Plant and Soil, 463(1-2), pp. 307-328. Springer 10.1007/s11104-021-04897-x

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Aims An essential task of agricultural systems is to im- prove internal phosphorus (P) recycling. Cover crops and tillage reduction can increase sustainability, but it is not known whether stimulation of the soil microbial commu- nity can increase the availability of soil organic P pools. Methods In a field experiment in southwest Germany, the effects of a winter cover crop mixture (vs. bare fallow) and no-till (vs. non-inversion tillage) on microbial P- cycling were assessed with soybean as the main crop. Microbial biomass, phospholipid fatty acids (PLFAs), P cycling enzymes, and carbon-substrate use capacity were linked for the first time with the lability of organic P pools measured by enzyme addition assays (using phosphodi- esterase, non-phytase-phosphomonoesterase and fungal phytase).
Results Microbial phosphorus, phosphatase, and fatty acids increased under cover crops, indicating an en- hanced potential for organic P cycling. Enzyme-stable organic P shifted towards enzyme-labile organic P pools. Effects of no-till were weaker, and a synergy with cover crops was not evident.
Conclusions In this experiment, cover crops were able to increase the microbially mediated internal P cycling in a non-P-limited, temperate agroecosystems.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geography > Physical Geography > Unit Soil Science
08 Faculty of Science > Institute of Geography
08 Faculty of Science > Institute of Geography > Physical Geography

UniBE Contributor:

Jarosch, Klaus

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0032-079X

Publisher:

Springer

Language:

English

Submitter:

Andrea Katja Weber

Date Deposited:

15 Apr 2021 10:59

Last Modified:

03 Jun 2021 01:33

Publisher DOI:

10.1007/s11104-021-04897-x

BORIS DOI:

10.48350/154721

URI:

https://boris.unibe.ch/id/eprint/154721

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