Response of phosphorus dynamics to sewage sludge application in an agroecosystem in northern France

摘要: Abstract Sewage sludge is a phosphorus (P) source alternative to P fertiliser derived from rock phosphate, but its impact on soil processes driving cycling in agroecosystems requires further study. In order optimise the use of for sustainable fertilisation, we need elucidate drivers dynamics. The present study aims at determining how different sludges (heated sludge, HS and composted CS) affect pools A field experiment was established amended either with or inorganic (triple superphosphate, TSP). Soil samples were collected five times during vegetation period, analysed Hedley fractions, microbial phosphatase activity. Phosphorus dynamics strongly influenced by concentrations sludge. About one year after application, highest concentration (HS) as effective TSP improve availability. immediately available plant uptake, high activity treatment evidenced that microorganisms released phosphatases which can hydrolyse HS-derived organic compounds. addition, content suggests assimilate into their own biomass. By contrast, lowest (CS) enriched primarily weakly-soluble resulting lower availability compared treatment. Our findings suggest both slow, continuous breakdown substrates allow using this resource an important mineral nutrition. This stresses characterise forms prior application field.