Akizu.\.\ .\.c;RiCL-i;ruK.\L ExperimivNT Station 



4 



/ / 



its Di-igin has nut been learned. A soil from the Casa Grande dis- 

 trict sent in to be tested for alkali showed nearly ten percent of 

 nitrate of soda. The sample was probably a surface incrustation 

 and did not represent the soil to any appreciable depth. This mate- 

 rial could be used to advantage as a fertilizer on lands in the neigh- 

 borhood that are poorly supplied with nitrogen. 



Several samples of saline materials and water from a barren 

 oil well have been submitted to be tested for potash. In every case 

 qualitative tests showed so little potassium that quantitative deter- 

 iiiiniations were nt)t made. Mesquite and brush ashes, and ashes 

 irom incinerators at the military camps have caused some public 

 interest as possible sources of fertilizer. While these materials will 

 seldom bear transportation charges to the fertilizer works, they of- 

 ten can be used locally with profit. Caution should be exercised, 

 h.owever, not to a])ply wood ashes to soils that tend to be black 

 alkaline. 



UNUSUAL FEEDING STUFFS 



In co-operation with other departments several analyses of 

 unusual feeding stuffs have been made. The results are shown in 

 the following table : 



TABL^ XX. — COMPOSITION OF UNUSUAL ARIZONA FEEDING STUFFS 



