. Bacteria in relation to soil fertility. Soil microbiology; Bacteriology, Agricultural. INFLUENCE OF SOIL ALKALI ON BACTERIA 191 Kinds of Alkali.—The main injurious constituents in alkali soils are sodium chloric! or common salt, sodium sulfate or Glau- ber salt, sodium carbonate, and less frequently sodium nitrate. Soils which have been the bed of seas or lakes contain in addition to the above constituents magnesium chlorid or bittern, magnesium sulfate or epsom salts, and calcium sulfate or gypsum. Where there is a large quantity of any or all of the above salts except sodium carbonate, it
. Bacteria in relation to soil fertility. Soil microbiology; Bacteriology, Agricultural. INFLUENCE OF SOIL ALKALI ON BACTERIA 191 Kinds of Alkali.—The main injurious constituents in alkali soils are sodium chloric! or common salt, sodium sulfate or Glau- ber salt, sodium carbonate, and less frequently sodium nitrate. Soils which have been the bed of seas or lakes contain in addition to the above constituents magnesium chlorid or bittern, magnesium sulfate or epsom salts, and calcium sulfate or gypsum. Where there is a large quantity of any or all of the above salts except sodium carbonate, it is known as white alkali. Such a soil is not. Fig. 39.—Vegetation on alkali and alkali free soil. (After Kearney et al.) necessarily white but is nearly free from sodium carbonate. Where there is considerable sodium carbonate or sodium nitrate present we have what is known as black alkali. It is so-called from the dark color which these constituents impart to the soil when they react with its organic matter. Black alkali is very de- structive to plants; it tends to puddle the soil, and the sodium carbonate clings very tenaciously to the soil particles, thus being very hard to wash out. Kind and Number of Microorganisms in Alkali Soil.— What a difference one observes in the native vegetation on look-. 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. , joint author. New York, D. Van Nostrand Co.
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