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D e x t e r S. T. Response of quack grass to defoliation and fertilization. Plant

Physiol., lil, 1936.

Dh e i n A. Einlluss der Schnitthaufigkeit auf Entwicklung und Ertrag der

Luzerne. Jahrbuch. Erfahr. Weid. 13, 1938.

D i t t m e r H . I. A quantitative study of the subterranean members of three

field grasses. Amer. Journ. Bot. 25, 9, 1938.

Do s t a 1 L. Zur experimentellen Morphogenesis Planzen. Flora, 103, 1911.

Du v a l J o u v e M. J. Sur les parois cellulaires du Panicum vaginatum. Godr.

et greh. Bull, de la societe botanique de France, XVI, 1869.

E r i c k s o n L. C. Growth of tomato roots as influenced by oxygen in the nutritive

solution. Amer. Journ. Bot. 33, 1946.

E s a u K. Anatomy of Seed plants. New York —London, 1960.

E v a n s M. The life history of timothy. U. S. Dep. Agr. Bull. 1450, 1927.

E v a n s M. W., G r o v e r F. O. Developmental morphology of the growing

point of the shoot and the inflorescence in grasses. Journ. Agr. Res., 61,

7, 1(940.

E v a n s E. W., J a m e s M. Wa t k i n s . The growth of Kentucky bluegrass

and of Canada bluegrass in late spring and in autumne as affected by

the length of day. Journ. Amer. Soc. Agron. 31, 1939.

E v a n s A., G u i 1d W. I. M. Studies on the relationship between earthworms

and soil fertility. Ann. Appl. Biol. 34, 1947.

F e r g u s o n T. P., G. Bond. Symbiosis of leguminous plants and nodule

bacteria. The growth of red clover of different oxigen tensions. Ann. Bot.

18(72), 1954.

F 1a m m E. Zur Lebensdauer und Anatomia einiger Rizome. 1922. Academ. der

Wiss. in Wien. Mathem. naturwissen. Klasse. Sitzungsber. Ab. 1. 131.

В. H. 1 bis 10.

G i r s t G. R., Mo t t G. O. Some effects of light intensity, temperature and

soil moisture on the growth of alfalfa, red clover and birdsfoot trefoil

seedlings. Jour. Agr. 49, 1, 1957.

G o e d e n w a a g e n M. A. I. Root development and drought phenomena, more

especially on grassland. Versl. Tech. Bijeenk. Comm. Hydrol. Onders.

T. N. O.

1

6

, 1952.

G r a b e r L. F. Food reserves in relation to other factors limiting the growth

of grasses. Plant Physiol.

6

, 1931.

G r a b e r L. F. Competetive efficiency and productivity of bluegrass (Poa pra-

tensis) with partial defoliations at two levels of cutting. Journ. Amer. Soc.

Agron. 5, 1933.

G r a b e r L. F., Re a m H. B. Growth of bluegrass with various defoliations

and abundant nitrogen supply. Jour. Amer. Soc. Agron., 23, 1931.

G r a b e r L. F., N e l s o n N. T., L e u k e l N. A., A l b e r t W. B. Organic food

reserves in relation to the growth of alfalfa and other perennial herbaceous

plant. Wisconsin Agr. Exp. Sta. Res. Bull. 80, 1927.

G r a n d f i e l d C. O. The trend of organic food reserves in alfalfa roots as

affected by cutting practices. Journ. Agric. Research, 1935.

G r a n d f i e l d C. O. The effect of time of cutting and winterprotection on the

reduction of stands in Kansas common grimm and alfalfa. Journ. Amer. Soc.

Agron. 26, 3, 1934.

G r a n d j e a n S. Die neuzeitliche Weidenutzung und ihr Einfluss auf Pflan-

zenertrag, Futterwertung und tierischen Nutzertrag. Schweizerische Land-

wirtsch. Monatsheft. 1938.

G r u mm e r G. Die gegenseitige Beeinflussung hoherer Pflanzen. Allelopathie.

Jena, 1955.

H a n s o n W. R., S t o d d a r t L. A. Effects of grazing upon bunch wheat

grass. Jour. Americ. Soc. Agron., 32, 1940.

H a r r i s o n С. M. Effect of cutting and fertilizer applications on grass deve*

lopment. Plant Physiology,

6

, 1931.

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