L. A. Magee
1958
Citations
0
Influential Citations
6
Citations
Journal
Journal name not available for this finding
Abstract
Field studies with Dalapon (sodium 2,2-dichloropropionate) and KH-30 (maleic hydraside diethanolamine) showed that repeated appli cation. of either herbicide in concentrations much higher than the recommended field application rates stimulated the multiplication of bacteria, molds, and actinoraycetes in the soil. Several strains of soil bacteria were isolated which could decom pose the 2,2-dichloropropionate. Degradation of the Dalapon resulted in a decrease of the pH of solid and liquid media containing Dala pon as the carbon source, the release of chloride ion into the medium, and measurable respiration which showed that oxygen was consumed when Dalapon was the sole carbon source. Certain soil organisms, some of which could not be demonstrated to decompose Dalapon, asscciatively overcame the inhibition of an agar-decomposing soil bacterium by 2,000 ppm Dalapon. The factors affecting polysaccharide formation by an MH-30-dissimilating bacterium identified as Alcaligenes faeqalis were studied. It was found that a magnesium deficiency, the presence of ammonium sulfate, insufficient aeration of the culture, and temperatures above 2? C inhibited gum formation without appreciably altering the total cell count. Deficiencies of phosphate, calcium, molybdenum, and iron