74 



EXPEULMEXT STATIOX. 



[Jan. 



To bring out in a more striking manner the differences in 

 the two types of soil, the results have been computed in Tables 

 X^os. 2 and 3, on the basis of pounds of the various constituents 

 per aero of soil containing 20 per cent, moisture.^ 



Table Xo. 2. — Showing iJie Average Composition of the Ah^wrmal as com- 

 pared with the Normal Soils. 



Pounds per Acre 



Abnormal Soils 



Average of 

 Five Analyses. 



Normal Soils. 



Average of 



Three Analyses. 



Total water soluble salines, 

 Soluble nitrogen, 

 Soluble potash, . 

 Soluble phosphoric acid. 

 Soluble calcium oxide. 

 Soluble sodium oxide, 

 Soluble magnesium oxide. 

 Soluble sulfates (SO3), 



27,363 

 1,156 

 6,743 



632 

 1,211 

 3,259 



966 

 1,240 



7,520 

 444 



1,328 

 208 

 864 



1,624 

 320 

 727 



This table shows a marked increase of soluble plant food in 

 the abnormal soils. To express this amount of plant food in 

 tenns of fertilizers, a calculation shows that to furnish the 

 nitrogen would require S'-Vi tons of nitrate of soda; to furnish 

 the potash, 6% tons of high-grade sulfate of potash; to furnish 

 the phosphoric acid, 2 tons of 16 per cent, acid phosphate; and 

 to furnish the lime, 1 ton of hydrated lime. To express the 

 results in terms of a mixed fertilizer made up of the highest 

 grades of material it would require an application of l-it/o tons 

 of a formula testing 4 per cent, nitrogen, 23 per cent, actual 

 potash and 2.25 per cent, available phosphoric acid. It should 

 be understood that the results given in the above table represent 

 only that portioii of the ])lant food which is soluhle in wafer. 



In Table Xo. 3 is shown the variation in composition of the 

 different sam]des in both types of soil. 



Assuming that an acre of soil 1 foot in depth weighs 3,000,000 pounds. 



