Influence of organic amendments on copper distribution among particle-size and density fractions in Champagne vineyard soils

  • Besnard E
  • Chenu C
  • Robert M
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Abstract

The intensive use for over 100 years of copper sulfate (Bordeaux mixture) to fight against mildew in vineyard soils has led to an important, widespread accumulation of Cu (100 to 1500 mg Cu kg-1soil). In Champagne vineyards, organic amendments are used currently to increase soil fertility and to limit soil erosion. Organic amendments may have a direct effect on the retention of Cu in the soil. To assess the influence of the organic management on the fate of Cu in calcareous Champagne vineyard soils, we studied Cu distribution (1) in the soil profile and (2) among primary soil particles, in vineyard parcels with different amendments. Amendments were oak-bark, vine-shoots and urban compost. The results were compared with the amount and the distribution of Cu in an unamended calcareous soil. Physical soil fractionations were carried out to separate soil primary particles according to their size and density. Cu has a heterogeneous distribution among soil particle fractions. Two fractions were mainly responsible for Cu retention in soils: the organic debris larger than 50 μm or coarse particulate organic matter (POM) issued from the organic amendments, and the clay-sized fraction

Author-supplied keywords

  • Calcareous soils
  • Copper
  • Particle-size fractionation
  • Particulate organic matter
  • Vineyard

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