Research BulletinThe Station, 1911 - Agricultural chemistry |
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Page 59
... plates when the medium contained peptone and when none of the acidity occasioned by the potassium acid phosphate was neutralized . MEDIUM ADOPTED FOR THIS INVESTIGATION The medium used in this experiment was made up accord- ing to these ...
... plates when the medium contained peptone and when none of the acidity occasioned by the potassium acid phosphate was neutralized . MEDIUM ADOPTED FOR THIS INVESTIGATION The medium used in this experiment was made up accord- ing to these ...
Page 60
... plates rotated carefully to insure a uniform distribution of the inoculum . The plates were then incubated at 20 ° C for three days . The same methods were employed at all samplings . PHYSIOLOGICAL METHODS It has long been a recognized ...
... plates rotated carefully to insure a uniform distribution of the inoculum . The plates were then incubated at 20 ° C for three days . The same methods were employed at all samplings . PHYSIOLOGICAL METHODS It has long been a recognized ...
Page 64
... Plates were prepared as has already been described . The numbers of bacteria obtained in the different soils are given in Table I , the results being calculated to the air dry basis . TABLE I. QUANTITATIVE DETERMINATIONS Bacteria per ...
... Plates were prepared as has already been described . The numbers of bacteria obtained in the different soils are given in Table I , the results being calculated to the air dry basis . TABLE I. QUANTITATIVE DETERMINATIONS Bacteria per ...
Page 66
... Plate I. With all the applications of lime the largest percentage gains in bacteria occurred at the first sampling . Following this a large increase in bacteria occurred in all the soils , and the larger numbers partially covered up the ...
... Plate I. With all the applications of lime the largest percentage gains in bacteria occurred at the first sampling . Following this a large increase in bacteria occurred in all the soils , and the larger numbers partially covered up the ...
Page 67
... Plate I. Quantitative Determinations . groups especially favored by the lime treatment . On the other hand the large number of bacteria produced by the lime treatment may have a limiting action on the groups of bacteria in which the ...
... Plate I. Quantitative Determinations . groups especially favored by the lime treatment . On the other hand the large number of bacteria produced by the lime treatment may have a limiting action on the groups of bacteria in which the ...
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Common terms and phrases
Acetic acid amides albumen agar amino acids ammonia ammonifying power ammonium sulfate amount applications of lime Artificial Humus Assistant Chief Assistant in Chemistry Assistant in Soil bacterial activities Bacteriology barium carbonate barium hydroxide carbon dioxide casein cent check soils Chem chemical Chief in Dairy clover color corn cottonseed meal decrease in numbers denitrification depth diamino differences distillate dried blood effects filtrate flask fresh soil frozen gave glycocoll grams air-dry soil greater green manure humus hydrochloric acid inches increase IOWA Kjeldahl lactic acid lead arsenate lime-sulfur modified synthetic agar moisture conditions moisture content monamino acids nitrates nitrifying nitrifying power nitrogen fixing number of organisms numbers of bacteria oats occurred organic nitrogen oxide peptone present production propionamide Propionic protein quantitative determinations results obtained samples showed silage silo soil nitrogen solution specific heat sterile substance TABLE temperature tests tion tons per acre treatment two-year rotation volatile acids
Popular passages
Page 147 - H; I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z a, b, c, d, o, f, g, h, i...
Page 385 - The specific heat of a substance is the number of calories required to raise the temperature of 1 gram of that substance by 1 ° C.
Page 385 - The ratio between the number of calories required to raise a given weight of a substance through a given temperature interval, and the number of calories required to raise the same weight of the standard substance through the same temperature interval is called the "specific heat
Page 162 - ... the winter there was a striking exception to this. In a continuation of the above work (Conn, 1912) his earlier findings were confirmed. The same marked increase in number of bacteria in frozen soil, and decrease in thawed soil, was noted. The increase during the winter was thought to be due to the actual multiplication of the bacteria rather than to a mere rise of the organisms from lower depths brought about by mechanical forces alone.
Page 402 - Milk which had been allowed to stand in iron dishes for several hours had a peculiar bluish gray color, indicating the presence of iron in solution.
Page 385 - The idea that the specific heat of a substance is not the same at all temperatures seems to have been suggested by Dalton.
Page 414 - Cedar Rapids. Hon. AB Funk, Spirit Lake. Hon. George T. Baker. Davenport. Hon. Charles R. Brenton. Dallas Center. Hon. EP Schoentgen, Council Bluffs. Hon.
Page 19 - ... acid in 100 cc of water. The washing is effected by rinsing the precipitate from the filter into a beaker and returning to the paper three successive times, each portion of the wash being allowed to run out completely before the next is applied. About 200 cc of washings are usually obtained. The nitrogen in the precipitate (diaminoacid or "basic...
Page 111 - THE CHEMICAL NATURE OF THE ORGANIC NITROGEN IN THE SOIL. Influence of various factors on decomposition of soil organic matter.
Page 163 - ... under similar conditions. He suggested the possibility that a different class of bacteria is in the ascendancy in winter from those which are benefited by the warm weather of summer; in which case the increase is not due directly to the low temperature, but to the depressing effect of the cold upon the group of bacteria which is able in summer to keep the winter bacteria in check.