. The chemistry of soils and fertilizers. Soils; Fertilizers. i8 SDILS AND FERTILIZERS boiling water, are placed in the sieve. Water is passed through until the washings are clear. All particles larger than mm. remain in the sieve, and after dry- ing and igniting, are weighed. The contents of flask r, containing the particles less than mm., are then passed through a sieve having holes mm. in diameter. Finally a o. 10 mm. diameter sieve is used. The fine sand and silt are separated by gravity. The fine sand with some silt and clay are read- ily deposited and the water containing th
. The chemistry of soils and fertilizers. Soils; Fertilizers. i8 SDILS AND FERTILIZERS boiling water, are placed in the sieve. Water is passed through until the washings are clear. All particles larger than mm. remain in the sieve, and after dry- ing and igniting, are weighed. The contents of flask r, containing the particles less than mm., are then passed through a sieve having holes mm. in diameter. Finally a o. 10 mm. diameter sieve is used. The fine sand and silt are separated by gravity. The fine sand with some silt and clay are read- ily deposited and the water containing the suspended clay is decanted into a second glass vessel. The residue is treated with more water and allowed to settle; this operation is repeated until the micro- scope shows the soil particles to be nearly all of one grade. Clay is obtained by evaporating an aliquot portion of the washings or by determining the total per cent, of the other grades of particles and the volatile matter and subtracting the sum from 100. This is the Osborne sedimentation method with modi- fications. 9 Hilgard's'° elutriator, and the apparatus of Shoen-Mayer are also used for separating the soil particles. SOIL TYPES II. Crop Growth and Physical Properties.—The. 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 Snyder, Harry, 1867-1927. Easton, Pa. , The Chemical Publishing Co.
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