University of Arizoxa 



.345 



due to sodium sulphate. Here again, however,- results are not en- 

 tirely consistent, probably due to water conditions. In general .10 

 seems to be the limiting percent of black alkali for these crops, 

 altho in one case a considerable stand was found where .22 percent 

 was present and considerable injury was noted where .06 percent 

 was present in samples believed to represent the soil under field 

 conditions. The alfalfa soils illustrate to a certain extent the in- 

 fluence of texture. Sample 5980 was a rather heavy soil occurring 

 near Wellton, Arizona, while 6197, 6198, 6199, and 6200 were from 

 the sandy soil of the University Farm. 



MISCELLANEOUS ANALYSES 



One interesting set of samples came from a mining com])any 

 that had failed in an attempt to raise a war garden and sought a 

 remedy. The soil was impregnated with copper, and the mine 

 water which was used for irrigating carried so much copper that 

 possibly it might have been recovered with profit. Such conditions 

 would inhibit practically all plant growth. 



Various materials of agricultural interest other than soils and 

 irrigating waters have been examined by the Chemists. These in- 

 clude foods and feeding stuffs such as barley flour, barley bran, 

 cottonseed meal, and fish meal. Only moisture, ash, and ether 

 extract were determined in the barley flour. Barley flour, being a 

 wartime product, probably will be of transient interest, but since 

 the product is rather uncommon and produced in Arizona the re- 

 sults are recorded in Table XX. 



TABLE XX. — composition OF ARIZONA BARLE^Y FLOUR 



Fertilizing materials or materials supposed to carry fertilizer 

 values, especially bat guanos, have been sent in from tiiue to time. 

 On one occasion the Chemists visited a bat cave deposit with a 

 prospector and advised against the shipment as unprofitable. 



At the time when food stuffs in general were suspected of 

 having been tampered with, a number of samples of corn meal and 

 cocoa were sent in to be examined for powdered glass. Several 



