REFERENCES 221 



white alkali and up to about 400 parts per million of black 

 alkali without apparent injury. Washingtonia palm and 

 camphor trees were rather sensitive to alkali even in small 

 quantities, especially of sodium carbonate and sodium 

 chloride. 



As these trees are adapted only to the warmer sections 

 with mild winters, they are of little value outside of the 

 Southwest. For the other sections certain of the poplars 

 or cottonwoods are probably the best adapted to alkali 

 lands. Locusts are also likely to do well where the alkali 

 is not too strong. 



Plants recommended by Kearney (17) as being suitable 

 for hedges and windbreaks are Russian olive (Elaeagnus 

 songoricd) (Bernh.) (Gray, F. F. and G.) for moderate 

 alkali, golden willow (probably Salix mtellina aured) for 

 regions having severe winters, pomegranate (Punica gr ana- 

 turn], and tamarisk (Tamarix gallica) which are de- 

 cidedly resistant, for the southwestern alkali lands, as 

 well as certain of the larger salt-bushes. A triplex breweri 

 and A. longiformis are the species especially recommended 

 for this purpose. 



REFERENCES 



1. COE, H. S. Sweet Glover: Growing the Crop. U. S. D. A. Farmers' 



Bui. 797 (1917), p. 13. 



2. CONNOR, S. D. Indiana Soils containing an Excess of Soluble Salts 



Proc. Ind. Acad. Sci. 1916, pp. 403-404. 



3. DORSEY, C. W. Alkali Soils of the United States. U. S. D. A. Bur. 



Soils, Bui. 35 (1906), pp. 7-196. 



4. DYMOND, T. S., and HOUSTON, D. Salt Water Flood of November 



29, 1897. Jour. Essex Tech. Lab. Vol. 3, pp. 173-182. 

 (Abs. E. S. R. ii, pp. 326-327.) 



5. ECKART, C. F. A Consideration of the Action of Saline Irrigation 



Water. Hawaiian Sugar Planters' Sta. Rpt. 1902. 



