|Tenuta, Mario - UNIV OF MANITOBA, CANADA|
Submitted to: American Phytopathological Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: April 1, 2003
Publication Date: June 1, 2003
Citation: Zasada, I.A., Tenuta, M. 2003. Chemical-mediated lethal effects of N-Viro Soil against Heterodera glycines [abstract]. Phytopathology 93, p. S93. Technical Abstract: N-Viro Soil (NVS) is an alkaline stabilized municipal biosolid used as a soil amendment. Previous research demonstrated lower populations and reduced egg hatch of Heterodera glycines after NVS application. The mechanism(s) of nematode suppression by this amendment are unknown. This study evaluated NVS-mediated changes in soil chemical properties and their impact upon survival of second-stage juveniles of H. glycines. In soil microcosms, NVS was applied at rates corresponding to 0, 12, 34 and 68 t/ha. There was a reduction in nematode survival at all NVS application rates. Increasing rates of NVS were strongly correlated with higher soil pH levels. Cations, anions , and NH3 concentrations in soil solution were also correlated with nematode survival in amended soil. This study is part of a comprehensive research program initially identifying abiotic and biotic mechanisms responsible for the reduction of plant-parasitic nematodes in NVS-amended soil. Thereafter the use of NVS will be optimized in a strategy to control plant disease.