EXPERIMENT STATION BULLETINS. 



459 



TABLE 5.— COMl'AKATIVE RETURNS FROM THE USE OF ACID PHOSPHATE UNDER 

 CONDITIONS OF HIGH AND LOW PRICES FOR PRODUCE AND FERTILIZER. 



Crop 



Wheat . 

 Clover. 



Oats . . 

 Clover . 



Wheat . 

 Clover . 



Oats . . 

 Clover 



Increased yield due 

 to fertilizer. 



(irain 



9 bu. 



25 bu. 



9 bu. 



25 bu. 



Straw 



900 lbs. 

 1,200 lbs. 



1.250 lbs. 

 1,200 lbs. 



900 lbs. 

 1,200 lbs. 



1,250 lbs. 

 1,200 lbs. 



Value of 

 increase. 



Grain 

 per bu. 



$2.00 



.70 

 1 .00 

 .40 



Straw 

 and hay 

 per ton. 



$3.00 

 15.00 



3.50 

 15.00 



1.50 

 7.00 



2.00 

 7.00 





$28.35 

 ' 28.69 

 ' 13.88 



15.45 



O N 



O 



$3.20 



3.20 



2.00 

 '2.06 





o 



O 



$3.50 



3.50 



3.00 

 3.06 



O © N 



® m C 



. P cS 



$21.65 



21.99 



7.88 

 9 . 45 



These figures show that when tliere is a substantial increase in yield 

 from the use of phos[)Ii()i'us a greater profit may be derived under the 

 first set of conditions, namely, high prices for fertilizer and crops grown, 

 than under the latter, or lower prices. 









Figure 19. — Some soils are exceetfingly responsive to fertilizers. The two rows of corn shown 

 in the center of the photograph and several in the right were unfertilized. The others 

 received' 125 pounds per acre of a complete fertilizer. (Courtesy of C. ^NI. Kidman) 



Furthermore, there is a tendency to overlook the importance of increas- 

 ing crop yields by means of lime, phosphates, manures and other mater- 

 ials to the farm management scheme. Suppose for example a live-stock 

 farmer is able by the judicious use of lime and phosphate to grow satis- 

 factory yields of alfalfa or clover and thereby decrease the consum|)tion 

 of high priced mill feeds, and in addition the grain production is increased 



