May =9.1916 Root Systeiiis and Leaf Aveas of Corti and Sorghuiu 331 



The two sorghums have, in the first place, as compared to the com 

 plant, only one-half the leaf surface exposed for the evaporation of water; 

 and in the second place they have a root system which, judging from the 

 number of secondary roots, would be twice as efficient in the absorption 

 of water from the soil. 



LITERATURE CITED 



(i) Briggs, L. J., and Shantz, H. L. 



1912. The wilting coefficient for different plants and its indirect determination. 



U. S. Dept. Aer. Eur. Plant Indus. Eul. 230, 77 p., 9 fig., 2 pi. 

 (2) 



1913. The water requirement of plants. I. — Investigations in the Great Plains 



in 1910 and 1911. U. S. Dept. Agr. Bur. Plant Indus. Bui. 284, 49 p., 

 II pi. 



(3) Hellriegel, Hermann. 



1883. Beitrage zu den naturvvissenschaftlichen Grundlagen des Ackerbaus . . . 

 Abschnitt 2. — Wurzel und Bodenvolumen. p. 118-280, 7 fig. 



(4) KlESSELBACH, T. A. 



19 10. Transpiration experiments with the com plant. In Nebr. Agr. Exp. 

 Sta. 23d Ann. Rpt. [1909], p. 125-139, 2 fig. 



(5) King, F. H. 



1893. Natural distribution of roots in field soils. In Wis. Agr. Exp. Sta. 9th 

 Ann. Rpt. [1891]/ 92, p. 112-120, fig. 9-17. 



(6) ROTMISTROV, V. G. 



1909. Root- Systems of Cultivated Plants of One Year's Gro^vth. 57 p., illus. 

 Odessa. 



(7) SCHULZE, B. 



1914? Studien iiber die Bewurzelung unserer Kultiupfianzen. In Festschrift, 

 50. JubilaumAgr. Chem. Versuchs.u.Kontroll-Stat., Breslau, p. 67-95, 

 10 pi. 



(8) Seelhorst, C. von, and Freckmann, W. 



1903. Der Einfluss der Wassergehaltes des Bodens auf die Ernten und die 



Ausbildung verschiedener Getreide-Varietaten. In Joiy. Landw., 

 Bd. 51, Heft 3, p. 253-269. 



(9) Ten Eyck, A. M. 



1899. A study of the root systems of wheat, oats, flax, corn, potatoes and sugar 



beets and the soil in which they grew. N. Dak. Agr. Exp. Sta. Bui. 

 36, p. 333-362. 



(10) 



1900. A study of the root systems of cultivated plants grown as farm crops. 



N. Dak. Agr. Exp. Sta. Bui. 43, p. 535-550, 15 fig. 



(11) 



1904. The roots of plants. Kan. Agr. Exp. Sta. Bui. 127, p. 199-252, i fig., 



26 pi. 



(12) Tucker, M., and Seelhorst, C. von. 



1898. Der Einfluss, welchen der Wassergehalt und der Reichtum des Bodens 

 auf die Ausbildung der Wurzein und der oberirdischen Organe der 

 Haferpflanze ausiiben. In Jour. Landw., Bd. 46, Heft i, p. 52-63. 



