Effect of repeated applications of sewage sludge on the fate of N in soils under Monterey pine stands

An experiment was conducted to evaluate the influence of repeated application of sewage sludge, on N dynamics in soils under Monterey pine (Pinus radiata D. Don.) stands. Sludge with a total N concentration of 4.2% was applied at four different loading rates (0, 2.4, 17, and 60 Mg ha−1 year−1, DW equivalent), in two consecutive autumns. Soils were sampled once a year to a depth of 53 cm, and leachates were collected at 25 and 50 cm depth, after...