Articles
EFFECT OF OZONE TREATMENT ON SUPPRESSIVITY OF A COMPOSTED SEWAGE SLUDGE ON MELOIDOGYNE INCOGNITA
Article number
883_50
Pages
403 – 408
Language
English
Abstract
Soil amendments from composted sewage sludge are reported to be potentially suppressive to soil phytoparasitic nematodes.
A preliminary treatment of compost with gaseous or liquid ozone can reduce heavy metals and suppress biological contaminants contained in raw sewage sludge, but effects on nematode suppressivity of compost amendments are not known.
An experiment on tomato in potting mixes infested by the root-knot nematode Meloidogyne incognita was carried out to verify the effect of gaseous ozone treatment on the nematicidal properties of a sewage sludge compost (70% urban green residues and 30% municipal sewage sludge). Composted sewage sludge was treated for 3, 6 and 9 h with gaseous ozone and then added at 10, 20, 40 and 80 g kg-1 soil rated to a soil infested by M. incognita. Five 1.5 L tomato planted pot replicates were provided for each ozonation time x compost rate combination, whereas controls were represented by infested and nontreated or phenamiphos-treated and untreated and noninfested soil.
No ozone treatment affected the nematicidal effect of the compost, as M. incognita population from ozonated compost treatment were not statistically different from the nonozonated compost, as well no significant effect was observed on tomato plant growth.
All the rates of the sewage sludge compost significantly reduced nematode population density, either in soil or on tomato roots, compared to the no composted soil, whereas only the two highest compost rates significantly reduced formation of galls on tomato roots.
Moreover, all the compost amendment resulted also in a significant increase of tomato plant growth.
Gaseous ozone treatments consistently affected the content of soluble heavy metals of the compost, as Mn and Cu concentration was reduced by six and four times, respectively, after a 3 h ozone treatment, whereas Ni and Fe were reduced by 55 and 60%, respectively, after a 9 h ozonation.
A preliminary treatment of compost with gaseous or liquid ozone can reduce heavy metals and suppress biological contaminants contained in raw sewage sludge, but effects on nematode suppressivity of compost amendments are not known.
An experiment on tomato in potting mixes infested by the root-knot nematode Meloidogyne incognita was carried out to verify the effect of gaseous ozone treatment on the nematicidal properties of a sewage sludge compost (70% urban green residues and 30% municipal sewage sludge). Composted sewage sludge was treated for 3, 6 and 9 h with gaseous ozone and then added at 10, 20, 40 and 80 g kg-1 soil rated to a soil infested by M. incognita. Five 1.5 L tomato planted pot replicates were provided for each ozonation time x compost rate combination, whereas controls were represented by infested and nontreated or phenamiphos-treated and untreated and noninfested soil.
No ozone treatment affected the nematicidal effect of the compost, as M. incognita population from ozonated compost treatment were not statistically different from the nonozonated compost, as well no significant effect was observed on tomato plant growth.
All the rates of the sewage sludge compost significantly reduced nematode population density, either in soil or on tomato roots, compared to the no composted soil, whereas only the two highest compost rates significantly reduced formation of galls on tomato roots.
Moreover, all the compost amendment resulted also in a significant increase of tomato plant growth.
Gaseous ozone treatments consistently affected the content of soluble heavy metals of the compost, as Mn and Cu concentration was reduced by six and four times, respectively, after a 3 h ozone treatment, whereas Ni and Fe were reduced by 55 and 60%, respectively, after a 9 h ozonation.
Publication
Authors
N. Sasanelli, T. D’Addabbo, L. Mancini, F. Ciccarese
Keywords
heavy metals, sewage sludge compost, root-knot nematodes
Online Articles (52)