Root growth and turnover in perennial forages as affected by management systems and soil depth
Autor: | Denis A. Angers, Martin H. Chantigny, Anne Vanasse, Marie-Noëlle Thivierge, Florian Fort, Gilles Bélanger, Stéphanie Houde |
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Rok vydání: | 2020 |
Předmět: |
0106 biological sciences
Topsoil biology Perennial plant Soil Science Forage 04 agricultural and veterinary sciences Plant Science Root system engineering.material biology.organism_classification 01 natural sciences Phleum Agronomy 040103 agronomy & agriculture engineering 0401 agriculture forestry and fisheries Soil horizon Fertilizer Festuca arundinacea 010606 plant biology & botany |
Zdroj: | Plant and Soil. 451:371-387 |
ISSN: | 1573-5036 0032-079X |
Popis: | Aims Extensive knowledge of perennial forage root systems is essential, given their critical role in below-ground C input. Methods Root length and diameter were quantified periodically from 2016 to 2018 with minirhizotrons in a field experiment with three forage management systems: mixture of timothy (Phleum pratense L.) and tall fescue (Festuca arundinacea Schreb.) fertilized with (i) dairy cattle slurry or (ii) calcic ammonium nitrate, and (iii) mixture of timothy, tall fescue, and alfalfa (Medicago sativa L.) without N fertilization. Root biomass was measured yearly by coring. Results Management systems with the two fertilization sources did not differ in root elongation, but the management system with alfalfa resulted in a slower root elongation after the first defoliation and a lower root mortality in the fall. Root length turnover was greater in the topsoil with dairy cattle slurry than with calcic ammonium nitrate. Fine roots dominated the surface soil and coarse roots the deeper soil layers. Conclusions Root growth and mortality were more contrasted between systems that differed by the presence of alfalfa than by fertilizer source. As many root characteristics are drivers of soil C storage, the choice of perennial species in mixtures appears as a key management factor for sustainable farming systems. |
Databáze: | OpenAIRE |
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