Experiment Station Record, Volume 92, January-June, 1945 Page: 21
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19451 SOILS-FERTILIZERS 21
plants; miscellaneous problems on the occurrence and activities of fungi; and role
of fungi in soil processes and in plant nutrition.
The nitrogen and mineral contents of sugar beet sections, C. T. HIRST and
J. E. GREAVES. (Utah Expt. Sta.). (Soil Sci., 58 (1944), No. 1, pp. 25-34, illus. 3).
-The average content of nitrogen in the tops and crowns of the beets produced on
1 acre with manure or ammonium sulfate was 64.6 lb. This nitrogen, at 15 ct. a
pound, would cost $9.69. The average nitrogen content in the tops and crowns on
the nonmanured plots not fertilized with ammonium sulfate was 27.6 lb. (cost in
reduced soil fertility, $4.14). The percentages of phosphorus were considerably lower
in the beets than in the leaves. The phosphorus content of all sections of the sugar
beet plant was increased by manure and phosphorus fertilizer, the average number
of pounds of phosphorus in the leaves and tops of beets produced on 1 acre with
manure and phosphorus fertilizer being 4.8 and in nonmanured, nonphosphorusfertilized
beets 1.9 lb. The commercial fertilizer cost of either would be small. The
percentages of calcium and magnesium were greatest in the leaves and least in the
beets. The quantity in the crowns was greatest next to the leaves and decreased
,as the distance from the leaves increased. The beet leaves contained approximately
30 percent of the total moist weight, 65 percent of the total nitrogen, and 50 percent
of the total phosphorus.
The nitrogen content of crowns and leaves computed to the dry basis approximates
that of first crop alfalfa, and feeding tests have indicated that the coefficient of
digestibility compares favorably with that of alfalfa. Other feeding tests cited
have shown that 1 ton of moist beet tops and crowns approximates 14 lb. of shelled
corn and 72 lb. of alfalfa in feeding value. The phosphorus content of the leaves
and crowns of sugar beets is lower than that of alfalfa, and it is held highly probable
that their nutritive value would be increased by a phosphorus supplement.
Noxious nitrogen in leaves, crowns, and beets of sugar beet plants grown
with various fertilizers, C. T. HIRST and J. E. GREAVES. (Utah State Agr. Col.).
(Soil Sci., 57 (1944), No. 6, pp. 417-424, illus. 1).-Although they do not consider
their results conclusive, the authors feel that their data point to the conclusion that
fertilizers increase the noxious nitrogen of the various sections of the plant. The
total quantity of noxious nitrogen contained in the beet sections, produced on 1 acre
of soil, varied from 0.4 lb. in the best crowns to 11 lb. in the beets, as an average.
The leaves carried an average of 10 lb. These values varied widely, depending on
the fertilizer treatment. The percentages of total nitrogen occurring as noxious
nitrogen in the various sections of sugar-beet plants varied from 28 in the top
crown section to 35.7 in the leaves.
Beet crowns and leaves, because of the quantities of betaine which they contain,
probably have special nutritive value when fed to hogs, beef cattle, sheep, chickens,
and turkeys; but the betaine content may unsuit them as feed for milk cows.
Phosphorus fixation by the coarse and fine clay fractions of kaolinitic and
montmorillonitic clays, R. COLEMAN. (Miss. Expt. Sta.). (Soil Sci., 58 (1944),
No. 1, pp. 71-77, illus. 3).-Phosphorus fixation by hydrogen- and ammoniumsaturated
coarse and fine clay fractions of Susquehanna clay loam and Orangeburg
sandy loam was determined at various reactions both before and after the free iron
and aluminum oxides were removed.
All of the phosphorus held by the coarse clay and most of the phosphorus held by
the fine clay was fixed by the free iron and aluminum oxides. Kaolinite and montmorillonite
in the fine clay fixed appreciable quantities of PO, but the kaolinite,
montmorillonite, quartz, and mica in the coarse clay minerals did not fix phosphate.
Phosphorus fixation by both coarse and fine clays is influenced by reaction and
exchangeable cations only in the presence of the free iron and aluminum oxides.
The coarse clays, containing about one half as much free iron and aluminum oxides
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U.S. Department of Agriculture. Agricultural Research Administration. Office of Experiment Stations. Experiment Station Record, Volume 92, January-June, 1945, book, 1947; Washington. (digital.library.unt.edu/ark:/67531/metadc5064/m1/34/: accessed February 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.