Experiment Station Record, Volume 92, January-June, 1945 Page: 43
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1945 FIELD CROPS 43
Sedges and rushes of Colorado (grass-like plants), E. C. SMITH and L. W.
DURRELL (Colorado Sta. Tech. Bul. 32 (1944), pp. 63, illus. 14).-Sedges and
rushes form an appreciable part of the forage resources of Colorado, but unequal
forage value of different species make their identification important. Species existing
in Colorado are described and illustrated and are classified in determinative
keys with comments on distribution and palatability. A glossary and an index are
Root reserves of South Africafi highveld grasses in relation to fertilizing and
frequency of clipping, H. WEINMANN (Jour. So. African Bot., 10 (1944), No.
2, pp. 37-54, illr. 3).-Five important high-veld grasses growing under natural
conditions, Trachypogon plumosus, Tristachya hispida, Eragrostis chalcantha, and
Brachiaria serrata, all typically tufted, and Digitaria tricholaenoides, which forms
irregular mats by means of rhizomes, were cut 1, 2, 4, 9, and 16 times per
season for 2 yr. Increased frequency of clipping reduced weights of roots and
rhizomes and lowered the percentages of reducing sugars, nonreducing sugars, and
starch in these organs, while the percentage of acid-hydrolyzable polysaccharides
remained unaffected. Fertilizers increased root weights of some species under
moderate defoliation but had little effect on carbohydrate content. Cutting at fortnightly
intervals (16 times per season) for 2 yr. led to almost complete exhaustion
of root reserves and to death of many plants. Fertilizer (NPK) tended to aggravate
rather than to counteract these effects of excessive defoliation. Weights and carbohydrate
content of rhizomes of D. tricholaenoides were less affected by frequent
clipping than those of the roots of this and other species. Depletion in root reserves
due to frequent clipping was associated with corresponding reductions in herbage
The growth and carbohydrate responses of Agropyron smithii and Bouteloua
gracilis to changes in nitrogen supply, H. M. BENEDICT and G. H. BROWN.
(U. S. D. A.). (Plant Physiol., 19 (1944), No. 3, pp. 481-494).--Lack of N reduced
the total weight of plants of bluestem and blue grama (common range
grasses in the central Great Plains) grown from seed and clones, 1936, 1938-40, in
complete and -N solutions, but favored root growth while abundant N favored
top growth more. The main effect of lack of N was to increase the percentage of
sucrose and starch in bluestem (its carbohydrate reserves), and of sucrose in blue
grama. Making N available to plants without it for a time tended to reduce the
percentage of carbohydrates built up when N was lacking.
Six alfalfa varieties tested for 7 years at high altitudes; "Ladak" is best yielder,
D. KOONCE (Colo. Farm Bul. [Colorado Sta.], 6 (1944), No. 4, pp. 10-11).-Acre
yields of alfalfa varieties grown at Fort Lewis Substation, 1937-43, under disease-,
free conditions, averaged for Ladak 4.85 tons air-dry forage, Grimm (local) 4.63,
Meeker Baltic 4.58, Grimm 4.53, Colorado common 4.51, and Hardistan 4.36 tons.
About 59-60 percent of the total average yield was obtained at first cutting, July 3,
and 40-41 percent at second cutting September 13.
Influence of fertilizers on the accumulation of roots from closely clipped bent
grasses and on the quality of the turf,' R. S. BELL and J. A. DEFRANCE. (R. I.
Expt. Sta.). (Soil Sci., 58 (1944), No. 1, pp. 17-24).-Continued experiments
(E. S. R., 81, p. 504) showed that increasing the quantities of N or K applied to
bentgrass putting greens may increase the weight of accumulating roots, whereas
large amounts of P may reduce root accumulations. The state of equilibrium
between growth and decay of grass roots does not affect materially the quality of
the turf if adequate N, balanced with a moderate quantity of P and a small amount
of K, is applied at suitable intervals. Piper velvet bent accumulated more roots
than Rhode Island bent or Washington creeping bent, which were similar in root
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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/m1/56/: accessed February 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.