Submitted to: American Phytopathological Society Potomac Division Meeting
Publication Type: Abstract Only
Publication Acceptance Date: April 1, 2004
Publication Date: August 9, 2004
Citation: Zasada, I.A. 2004. Factors affecting the heterodera glycines suppressiveness of n-viro soil. American Phytopathological Society Potomac Division Meeting Abstracts. APS Publication no. P-2005-0020-PTA. Technical Abstract: N-Viro Soil (NVS) is an alkaline stabilized municipal biosolid that has been used as a soil amendment. Previous laboratory research demonstrated that NVS suppressed Heterodera glycines. This study aimed to identify factors that could potentially influence the efficacy of NVS as a H. glycines management tool. NVS was applied to soil microcosms, and nematode survival and changes in sand solution pH and ammonia were measured. Microbes associated with NVS appeared not to be responsible for the nematode suppressiveness of the amendment; there was no difference in nematode suppression between sterilized and unsterilized NVS. Alkaline-stabilization of biosolids was necessary to achieve nematode suppression. Biosolids applied at rates ranging from 1 to 3% dry w/w did not suppress H. glycines to the same level as equivalent amounts of NVS. Sand solution pH levels after biosolid application ranged from 7.7 to 8.6. The ability of NVS from different geographical sources to suppress nematodes was related to sand solution pH levels. NVS sources applied at 2% dry w/w resulting in sand solution pH levels above 10.0 reduced H. glycines survival 94% or more.