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Research article - Peer-reviewed, 2015

Net primary productivity and below-ground crop residue inputs for root crops: Potato (Solanum tuberosum L.) and sugar beet (Beta vulgaris L.)

Bolinder, Martin; Kätterer, Thomas; Poeplau, Christopher; Börjesson, Gunnar; Parent, L.E

Abstract

Root crops are significant in agro-ecosystems of temperate climates. However, the amounts of crop residues for these crop types are not well documented and they need to be accounted for in the modeling of soil organic carbon dynamics. Our objective was to review field measurements of root biomass left in the soil as crop residues at harvest for potato and sugar beet. We considered estimates for crop residue inputs as root biomass presented in the literature and some unpublished results. Our analysis showed that compared to, for example, cereals, the contribution of below-ground net primary productivity (NPP) to crop residues is at least two to three times lower for root crops. Indeed, the field measurements indicated that root biomass for topsoils only represents on average 25 to 30 g dry matter (DM) m(-2) yr(-1). Other estimates, albeit variable and region-specific, tended to be higher. We suggest relative plant DM allocation coefficients for agronomic yield (R-P), above-ground biomass (R-S) and root biomass (R-R) components, expressed as a proportion of total NPP. These coefficients, representative for temperate climates (0.739:0.236:0.025 for potato and 0.626:0.357:0.017 for sugar beet), should be useful in the modeling of agro-ecosystems that include root crops.

Keywords

Roots; soil organic carbon; crop residues; agro-ecosystems; root crops

Published in

Canadian Journal of Soil Science
2015, volume: 95, number: 2, pages: 87-93
Publisher: AGRICULTURAL INST CANADA

Authors' information

Swedish University of Agricultural Sciences, Department of Ecology
Swedish University of Agricultural Sciences, Department of Ecology
Poeplau, Christopher
Swedish University of Agricultural Sciences, Department of Ecology
Poeplau, Christopher
Thünen Institute (vTI)
Swedish University of Agricultural Sciences, Department of Soil and Environment
Parent, L.E
Laval University

UKÄ Subject classification

Soil Science

Publication Identifiers

DOI: https://doi.org/10.4141/CJSS-2014-091

URI (permanent link to this page)

https://res.slu.se/id/publ/68067