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Article Dans Une Revue Soil Science Society of America Journal Année : 1996

The fate of sludge phosphorus in soil-plant systems

Résumé

Sewage sludges have been used for many years as sources of P for agricultural crops, but there is a lack of information regarding the proportion of sludge P that can be used by crops. The aim of this work was to assess the importance of soil available P and sludge origin on the utilization of sludge P by plants. First, the changes in soil P isotopically exchangeable within 1 min (E1min) were measured in incubated soil-sludge mixtures using two soils and four sludges. Then, the uptake of sludge P by ryegrass (Lolium perenne L.) was measured on the same sludge-amended soils. The application of sludges increased Elmin to values lower or equal to those obtained following the application monocalcium phosphate. Similarly the utilization of sludge P by ryegrass was systematically lower than the utilization of P derived from a water-soluble fertilizer. In both soils, the lowest utilization of sludge P was observed for the two FeSO4 flocculated and anaerobically digested sludges, while the primary sludge and the aerobically digested sludge released somewhat higher quantities of P to ryegrass. In the clayey soil, the amount of sludge P taken up by the crop was significantly related both to the sludge and soil available P content, whereas no such relation was observed in the loamy soil because of its high available P content. The origin of the sludge and the soil available P content must therefore be taken into account when advising sludge application to crops to adjust P inputs to plant needs.
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Dates et versions

hal-01486293 , version 1 (09-03-2017)

Identifiants

  • HAL Id : hal-01486293 , version 1
  • PRODINRA : 35502
  • WOS : A1996UW89000041

Citer

E. Frossard, S. Sinaj, L-M. Zhang, Jean-Louis Morel. The fate of sludge phosphorus in soil-plant systems. Soil Science Society of America Journal, 1996, 60 (4), pp.1248-1253. ⟨hal-01486293⟩
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