Changes in soil phosphorus pools of grasslands following 17 yrs of balanced application of manure and fertilizer

C. van der Salm*, J.C. van Middelkoop, P.A.I. Ehlert

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)

Abstract

Limiting the use of phosphorous (P) in intensive agriculture is necessary to decrease losses to surface waters. Balanced fertilizer application (P supply equals P offtake by the crop) is a first step to limit the use of P. However, it is questioned whether this balance approach is sufficient to maintain soil fertility. A long-term field experiment (17 yr), on grazed grassland, has been conducted on sandy soil, marine clay soil and peat soil to obtain insight into the effects of balanced P fertilizer application on soil test P values and to explain the results by changes in P pools in the soil. The balance approach led to a gradual decline in plant available P, measured as P-AL, in the topsoil (<0.10 m deep). This decline was accompanied by a decline in oxalate extractable P, dithionite extractable P and inorganic P (0.5 m H2SO4). The decline in these mineral P pools in the topsoil was (partly) compensated by an increase in the amount of organic P. There was evidence for the accumulation of P in an occluded form, especially at one of sites which received P as Gafsa rock phosphate [Ca3(PO4)2].

Original languageEnglish
Pages (from-to)2-12
JournalSoil Use and Management
Volume33
Issue number1
DOIs
Publication statusPublished - 2017

Keywords

  • balanced fertilizer application
  • grassland
  • long-term experiments
  • soil P balance
  • Soil test P

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