Full TGIF Record # 5914
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Author(s):Smith, Rex L.; Schank, S. C.; Milam, J. R.; Littell, R. C.
Author Affiliation:Smith and Schank: Professor, Department of Agronomy; Milam: Associate, Microbiology, Department of Microbiology and Cell Science; Littell: Professor, Department of Statistics, University of Florida, Gainesville, FL
Title:Statewide search for highly active associative N2-fixation systems
Source:Soil and Crop Science Society of Florida: Proceedings. Vol. 41, 1982, p. 122-126.
# of Pages:5
Publishing Information:Hollywood, Florida: Soil and Crop Science Society of Florida
Keywords:TIC Keywords: Nitrogen fixation; Cynodon dactylon; Paspalum notatum; Acetylene reduction; Nitrogenase; Soil moisture; Zinc
Abstract/Contents:"A search was conducted in 57 of Florida's 67 counties for hightly active, associative (grass-bacteria) N2-fixing sites. Two hundred sixty-four soil-grass cores were analyzed for nitrogenase activity by the acetylene reduction method (AR). Cores that were collected by Extension Service personnel, shipped to Gainesville and analyzed after standardization in the greenhouse gave results similar to cores that were taken and analyzed directly. Four sites had cores which evolved over 1000 nM ethylene core-1hr-1, which is very high for grass-root-soil cores. Nineteen sites had cores with over 500 nM core-1hr-1 and 34 cores had over 300 nM core-1hr-1. Paspalum notatum Flügge was the most prevelent grass species in the highly active cores, and Cynodon dactylon (L.) Pers. was the next most prevelent. Soil moisture and zinc content were positively correlated and calcium content was negatively correlated with AR activity. Elevated soil moisture was required for high AR, but not all cores with elevated soil moisture were active. Acetylene reduction was positively correlated with CO2 concentration and negatively correlated with O2 concentration in the cores at the end of incubation. These active sites are being evaluated further to determine the necessary requirements and best organisms for active associative N2-fixation."
Geographic Terms:Florida
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Smith, R. L., S. C. Schank, J. R. Milam, and R. C. Littell. 1982. Statewide search for highly active associative N2-fixation systems. p. 122-126. In Soil and Crop Science Society of Florida: Proceedings. Hollywood, Florida: Soil and Crop Science Society of Florida.
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