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Research article2013Peer reviewedOpen access

Phosphorus Leaching from Two Soils with Catch Crops Exposed to Freeze-Thaw Cycles

Riddle, Matthew; Bergström, Lars

Abstract

Catch crops have been found to decrease leaching of nitrates into surface water and groundwater, but they also have the potential to increase P loadings to natural waters due to plant destruction during freezing-thawing events. An indoor lysimeter experiment was performed using a clay and a sand soil with four different plant species applied: perennial ryegrass (Lolium perenne L.), honey herb (Phacelia tanacetifolia Benth.), chicory (Cichorium intybus L.), and oilseed radish (Raphanus sativus L.). These plants were exposed to simulated rainfall and freezing events in two separate experiments, one using topsoil columns with plant material added and one with plant material only. The sand and clay soils had significantly different control total-P leaching loads after all freezing events, with a mean of 0.32 kg ha(-1) for the clay and 0.88 kg ha(-1) (P < 0.001) for the sand. The combined (soil including plant material) total-P leaching loads from the clay soil were in the order: chicory (2.6 kg ha(-1)) > ryegrass (2.3 kg ha(-1)) > oilseed radish (2.2 kg ha(-1)) > honey herb (1.3 kg ha(-1)), with considerably smaller loads from the sand. Phosphorus losses were greater from the plant-only experiment, with chicory (51.7 kg ha(-1)) > oilseed radish (43.2 kg ha(-1)) > honey herb (18.4 kg ha(-1)) > ryegrass (10 kg ha(-1)). The results indicate that soil texture and plant choice can have a large impact on P leaching loads entering natural waters in cold regions and that soils act as an efficient filter for P released from catch crop residues.

Published in

Agronomy Journal
2013, Volume: 105, number: 3, pages: 803-811
Publisher: AMER SOC AGRONOMY

      SLU Authors

    • Sustainable Development Goals

      Ensure availability and sustainable management of water and sanitation for all

      UKÄ Subject classification

      Environmental Sciences related to Agriculture and Land-use

      Publication identifier

      DOI: https://doi.org/10.2134/agronj2012.0052

      Permanent link to this page (URI)

      https://res.slu.se/id/publ/55973