Research BulletinThe Station, 1911 - Agricultural chemistry |
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Page 140
... continuous and uniform outflow of water from the aspirator R is maintained which causes all of the carbon dioxide contained in the system to be absorbed by the tubes E and F. Ordinarily the absorption of carbon dioxide is completed in ...
... continuous and uniform outflow of water from the aspirator R is maintained which causes all of the carbon dioxide contained in the system to be absorbed by the tubes E and F. Ordinarily the absorption of carbon dioxide is completed in ...
Page 164
... continuous meadow , receiving no cultivation and no treatment of any kind . Prior to that time it was under an ordinary four year rotation . Here again artificial conditions were very largely eliminated . The plot seemed , therefore ...
... continuous meadow , receiving no cultivation and no treatment of any kind . Prior to that time it was under an ordinary four year rotation . Here again artificial conditions were very largely eliminated . The plot seemed , therefore ...
Page 211
... CONTINUOUS CROPPING AND VARIOUS ROTATIONS BY P. E. BROWN AGRICULTURAL EXPERIMENT STATION IOWA STATE COLLEGE OF AGRICULTURE AND THE MECHANIC ARTS AGRONOMY SECTION Soil Bacteriology AMES , IOWA OFFICERS AND STAFF IOWA AGRICULTURAL ...
... CONTINUOUS CROPPING AND VARIOUS ROTATIONS BY P. E. BROWN AGRICULTURAL EXPERIMENT STATION IOWA STATE COLLEGE OF AGRICULTURE AND THE MECHANIC ARTS AGRONOMY SECTION Soil Bacteriology AMES , IOWA OFFICERS AND STAFF IOWA AGRICULTURAL ...
Page 213
... continuous cropping on crop yields and soils . Historical 218 Discussion of previous investigations . The Plots Employed 220 Methods of Sampling The Quantitative Determinations The effect of drought Testing theories by results 221 221 ...
... continuous cropping on crop yields and soils . Historical 218 Discussion of previous investigations . The Plots Employed 220 Methods of Sampling The Quantitative Determinations The effect of drought Testing theories by results 221 221 ...
Page 215
... continuous cropping to wheat or corn . Investigators have shown that this continuous cropping of a soil will " wear it out " more or less quickly . They have also been striving for many years to convince the farmers that considerably ...
... continuous cropping to wheat or corn . Investigators have shown that this continuous cropping of a soil will " wear it out " more or less quickly . They have also been striving for many years to convince the farmers that considerably ...
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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.