Abstract
The effects of long-term use of the herbicides, trifluralin and alachlor, on crop yields and microbial populations were determined for continuous and rotated corn and soybeans under field conditions. Seven previous annual herbicide applications produced no lasting differences in populations of soil fungi, cellulolytic bacteria, pectinolytic bacteria, fluorescent Pseudomonas spp., or Gram-positive bacteria. Both herbicides caused temporary fluctuations in the populations of soil and rhizosphere bacteria. The effects of crop rotation on these microbial groups were confined to sampling times following crop residue incorporation. The average yield of rotated soybeans was 12% greater than that of continuous soybeans.
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