|Tyler, D - UNIVERSITY OF TENNESSEE|
Submitted to: American Phytopathological Society
Publication Type: Abstract Only
Publication Acceptance Date: December 1, 2006
Publication Date: February 3, 2007
Citation: Abdi, I., Donald, P.A., Tyler, D.D. 2007. Soybean cyst nematode reproduction related to tillage and rhizosphere microorganisms. American Phytopathological Society, Southern Division Meeting. http://apsnet.org/meetings/div/so07abs.aspg Technical Abstract: Differences in tillage may affect soybean cyst nematode, Heterodera glycines, (SCN) reproduction. Plots of no-tillage and tilled soybeans were established in 1979 in a randomized complete block design and individual plots were split in half in 2002 with conversion of tillage treatments to compare the long and short term differences of no-tillage and tillage. Research was initiated to determine if soil microorganisms were responsible for SCN reproduction differences. Data were collected on bacteria, fungi, protozoans, and SCN at planting and at harvest. The largest difference in SCN reproduction in 2006 was between the moldboard plow treatment established in 1979 and the portion of this plot which went no tillage in 2002. SCN reproduction increased 12 fold in the moldboard plowed area but only increased by 1.5 in the no till area. Over the growing season total bacteria increased 8 fold in the moldboard plow area but only 3 fold in the area which was no longer tilled. Frequency of total fungi was inversely related to the bacteria. The interactions of the various organisms relative to cyst nematode populations were analyzed with regression and principal component analysis techniques.