[Letters to Editor]


POT experiments are carried out by Dr. Hutchinsun and myself to run parallel with the chemical and bacteriological examinations of the soils. Productivity is not regarded as synonymous with bacterial activity, although in general the two are intimately related. An exception occurs when the soil has been heated sufficiently to decompose some of the organic matter present with formation of plant food. As stated in my letter, the addition to toluened soil of an aqueous extract of untreated soil increases crop productive ness.

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RUSSELL, E. [Letters to Editor]. Nature 83, 489 (1910). https://doi.org/10.1038/083489a0

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