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- W2066964693 abstract "ABSTRACT The effects of sewage sludge contaminated with heavy metals on the symbiotic effectiveness of R. trifolii, white clover N2 fixation and N mineralisation were investigated in surface (0–10 cm) soil from a 10 year-old field experiment at Glenfield, NSW. The soil had been amended with nil, low (40 dry t ha−1) or high (120 dry t ha−1) rates of sludge, applied annually for 5 consecutive years to an unlimed (pH 4.6) and limed (pH 5.2) red podsolic soil. The total heavy metal content of the soil collected from the site 5 years after the last sludge application ranged (mg kg−1 soil) 114–122 (nil sludge), 286–295 (low sludge) and 532–583 (high sludge). Air-dried soil was sieved (< 2 mm), then placed in pots which were sown to white clover and ryegrass, or to ryegrass only. The amount and proportion of clover N derived from air after 7 weeks growth in a glasshouse were determined using 15N isotope dilution; and the intrinsic symbiotic effectiveness (ISE) of R. trifolii isolated from the clover nodules was estimated from the N yield of clover seedlings grown on N-free seedling agar inoculated with the isolates. Treatment effects on N mineralisation were determined from the concentrations of inorganic N released on soil incubation with or without incorporated lucerne. Amending soil with sludge did not reduce the ISE of R. trifolii in either unlimed or limed soil, the between-isolate variance in ISE, nor the proportion of clover N derived from air, as compared to unamended soil. The amount of N fixed by clover was increased in the sludged soils. The concentrations of inorganic N in the N mineralisation study were greater in the sludge amended soils and with incorporation of lucerne; and the differences in inorganic N between plus and minus lucerne incorporation were similar in both the sludged and unamended soils. The sludge rates and associated heavy metal loads historically imposed on this soil have not proven detrimental to N2 fixation by R. trifolii, or to the net mineralisation of soil or incorporated organic N." @default.
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- W2066964693 date "1997-09-10" @default.
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- W2066964693 title "Symbiotic Effectiveness ofRhizobium trifoliiand Mineralisation of Legume Nitrogen in Response to Past Amendment of a Soil with Sewage Sludge" @default.
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- W2066964693 doi "https://doi.org/10.1300/j064v11n01_04" @default.
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