Long-term trends in phosphorus leaching and changes in soil phosphorus with phytomining

A. Svanbäck, B. Ulén, L. Bergström, Peter J A Kleinman

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Few mitigation strategies exist to reduce phosphorus (P) losses in leachate once soil P has built up. "Phytomining," or harvesting a crop without application of fertilizer P to create a negative P balance, has been proposed as a strategy for lowering soil P levels and preventing P loss to runoff and leachate. In this study crops were grown and harvested over 7 to 16 years in undisturbed soil columns (105 cm [41 in] deep) with contrasting textures (loamy sand, sandy loam, silty clay loam, and clay) and high P levels, while P loss in leachate was measured. Soil test P in the topsoil (0 to 20 cm [0 to 8 in] depth) was significantly decreased from the beginning to the end of the study for all soils, while a significant decreasing trend in dissolved reactive P in leachate was only observed in one soil. Downward movement of P from the topsoil to deeper layers was indicated to occur in three out of four soils. Although phytomining lowered soil test P by 11% to 37% in topsoils over the 7 to 16 year period of the study, results indicate that soils with P content well above agronomic optimum may take a much longer time to reach the agronomic optimum.

Original languageEnglish (US)
Pages (from-to)121-132
Number of pages12
JournalJournal of Soil and Water Conservation
Volume70
Issue number2
DOIs
StatePublished - Mar 1 2015

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Water Science and Technology
  • Soil Science
  • Nature and Landscape Conservation

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