. Bacteria in relation to soil fertility. Soil microbiology; Bacteriology, Agricultural. SOIL TEXTURE AND COMPOSITION 93 j^oeo aoo "fSO ffCO i ASP c£f/r a^ srom^ % p£p cavr OP jSi^cnsp//} § PEPC£y/roPS4cr£m^, tfi^uowj —0 pepce/vrop^^iAfMiy^/^ g ASPce/vroPAf/T^c/wrncKSSAf cent, while ten tons of manure increased the numbers 75 per cent. In soil deficient in organic matter the increase due to manure may be many times greater than this. The addition of sugar and various other easily decomposed carbohydrates may increase the numbers even more than do ma- nures. One of the great benefits comin
. Bacteria in relation to soil fertility. Soil microbiology; Bacteriology, Agricultural. SOIL TEXTURE AND COMPOSITION 93 j^oeo aoo "fSO ffCO i ASP c£f/r a^ srom^ % p£p cavr OP jSi^cnsp//} § PEPC£y/roPS4cr£m^, tfi^uowj —0 pepce/vrop^^iAfMiy^/^ g ASPce/vroPAf/T^c/wrncKSSAf cent, while ten tons of manure increased the numbers 75 per cent. In soil deficient in organic matter the increase due to manure may be many times greater than this. The addition of sugar and various other easily decomposed carbohydrates may increase the numbers even more than do ma- nures. One of the great benefits coming from the use of manures is the great increase in the bac- terial flora. Bacteria like higher plants are dependent upon a suitable tem- perature. They cannot multiply in a frozen soil. Although we often find that the number in a soil is increased after freezing this is due to many factors. The loosening up of the soil, suppress- ing of microorganisms which feed upon bacteria, and the ac- tual stimulation which comes from the cold—all of these may be responsible. We have seen that bacteria are directly dependent upon mois- ture for their life activities; hence, we find the number vary- ing with the moisture content. They increase with the moisture, probably until about 70 per cent of the water-holding capacity of the soil is reached. Then as the water increases the number of bacteria decreases. Alkali soils support a sparse, special vegetation. The same is true of the microflora of an alkali soil. A soil containing large quantities of alkali contains few bacteria but a considerable num-. -a? /H3» Mtf/i/pfr S TZiMS OPAUWi/P£ OP/'ii'Wijipe- Fig. 24. — Relationship between crop and bacteria in a Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Greaves, Joseph Eames, 1880-; Greaves, Ethelyn O.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbacteriologyagricult
