New Yoke Agricultural Experiment Station. 455 



(5) Effect of stable manure upon money value of crop. — The 

 use of 20 tons of stable manure per acre increased the money 

 value of the crops $12 to $33.03, with an average increase of 

 $21.80. In no instance was the increase of crop equal to the cost 

 of manure applied. In this connection, however, ought to be con- 

 sidered the fact that the plant-food in the stable manure would not 

 be completely used in one season. If its effects were continued 

 through two or three seasons, there would be some profit from its 

 use. 



III. COMPARISON OF COMMERCIAL FERTILIZERS AND STABLE 

 MANURE IN THE GROWING OF SUGAR BEETS. 



It will be a matter of interest to consider briefly side by side 

 some of the average results obtained in growing beets with the 

 use of commercial fertilizers and stable manure. For this pur- 

 pose we will use only the results obtained with 500 pounds of 

 commercial fertilizer. 



Amounts of Plant-Food Applied in the Commercial Fertilizer and in the 



Stable Manure Used. 



2 =>" 3 S 



&S= 2.2,,; 



sss §■§! 



p ut-i a <*> B 



I— 1 HH 



Lbs. Lbs. 



Nitrogen 21 200 



Phosphoric acid 36 100 



Potash 38 200 



It will be seen that the stable manure applied to one acre con- 

 tained about ten times as much nitrogen, three times as much 

 phosphoric acid, and five times as much potash, as did the 500 

 pounds of commercial fertilizer used. It is safe to assume that 

 one-third of the stable manure was available for the crop's use, 

 which would furnish the crop three times as much nitrogen, the 

 same amount of phosphoric acid, and twice as much potash as was 

 furnished by 500 pounds of the commercial fertilizer. 



