Bactericidal effects of certain herbicides applied to arable soils may possibly be as important as their herbicidal effects. This study was undertaken to determine the effects of a-chloro-N,N-diethylacetamide, 2-chloroallyl diethyldithiocarbamate, isopropyl-N-(3-chlorophenyl) carbamate, and an amine salt of 2,4-D on microbial activity in an incubated soil. Normal field rates of these herbicides had little effect on nitrification and carbon dioxide evolution. Higher rates inhibited nitrification but increased carbon dioxide evolution from the soil. Herbicidal selectivity among the organisms was indicated.

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Synopsis Yield of corn fertilized with NH4Cl was not significantly different from corn fertilized with other common nitrogen carriers. Increased absorption of Cl by plants did not alter the plant content of other mineral elements. Spring‐applied Cl was largely leached from the soil by the following spring.