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ARS Home » Southeast Area » Stoneville, Mississippi » Crop Genetics Research » Research » Publications at this Location » Publication #224078
Title: Effects of Selected Rhizosphere Microorganisms and Carbon on Soybean Cyst Nematode Population Density and Reproduction in Different Tillage Regimes

Author
item Donald, Patricia
item TYLER, DONALD - UNIV OF TN WTREC
item ABDI, IDRIS - LANE COLLEGE

Submitted to: International Congress of Nematology
Publication Type: Abstract Only
Publication Acceptance Date: 3/2/2008
Publication Date: 7/12/2008
Citation: Donald, P.A., Tyler, D.D., Abdi, I. 2008. Effects of Selected Rhizosphere Microorganisms and Carbon on Soybean Cyst Nematode Population Density and Reproduction in Different Tillage Regimes. International Congress of Nematology. p. 256.

Interpretive Summary:

Technical Abstract: Soybean cyst nematode (SCN) population density can be influenced by tillage practices. Data were collected over two growing seasons on total and active bacteria, total and active fungi, and protozoans (amobae, flagellates, ciliates) in the soybean rhizosphere to determine whether the levels of these organisms were related to differences in SCN population density and reproductive rate under different tillage regimes. Data were also collected on the levels of soil carbon in the tillage regimes. In 2006 and 2007 the population density of SCN was highest in treatments which had been tilled since 1979 (long-term tilled) and also in treatments which had been tilled for the last four years but previously were no-tilled. The highest levels of total bacteria were found in the long term tilled and no-tilled for the last four years (previously tilled) treatments. The long term no-till treatments had the lowest levels of total bacteria but the highest levels of flagellates. The SCN reproductive rate during this study was highest in the treatments which had been tilled since 1979. Levels of active bacteria, total fungi, active fungi, cilliates and amobae were similar in all treatments. SCN reproduction (Pf/Pi) was less than 1 in all treatments except the long term tilled plots in 2007 due to drought conditions.