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This article in JEQ

  1. Vol. 29 No. 3, p. 1010-1019
     
    Received: Apr 20, 1999
    Published: May, 2000


    * Corresponding author(s): cduwig@hort.cri.nz
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doi:10.2134/jeq2000.00472425002900030040x

Water Dynamics and Nutrient Leaching through a Cropped Ferralsol in the Loyalty Islands (New Caledonia)

  1. Céline Duwig *,
  2. Thierry Becquer,
  3. Iris Vogeler,
  4. Michel Vauclin and
  5. Brent E. Clothier
  1. IRD, Lab. d'Agropédologie, BP A5, 98848 Nouméa Cédex, New Caledonia.
    Lab. d'étude des Transferts en Hydrologie et Environnement (CNRS-UMR 5564, INPG, UJF, IRD), BP 53, 38041 Grenoble Cedex 9, France.
    HortResearch, PB 11-030, Palmerston North, New Zealand.

Abstract

Abstract

On the South Pacific islands, the change from traditional to more intensive agricultural practices is leading to more fertilizer use, both extensively and intensively. Nutrient leaching should be minimized to avoid plant deficiencies and ground water pollution. The fate of nitrate and potassium under corn (Lea mays L.) and perennial grass (Rhodes grass, Chloris gayana Kunth.) was monitored during three wet seasons on a Ferralsol soil from Mare in the Loyalty Islands. In 1995,130 and 41% of the applied NO3 and K+, respectively, leached beyond the root zone. Split application of the fertilizers in 1996 decreased the amounts leached to 48 and 11%, respectively. This reduction occurred even though the rainfall nearly doubled from 1995 to 1996. Nitrate and potassium transport, however, can be decreased due to their retention by this Ferralsol. Nitrate can be adsorbed on the positively charged surface of aluminum and ferric oxides. Due to the rapid drainage under tropical rainfall, however, this phenomenon is not very effective. Potassium is usually tightly fixed on 2:1 clay minerals, but these are nonexistent in our soil. Potassium also is bound to humic substances and the organic matter reaches 15% in the subsoil of this Ferralsol. Leaching of K+ was retarded compared with NO3, but was still quite high compared with others studies on tropical soils.

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