The Bulletin. 



45 



Continued. 



YEARS IN FIELDS A, B, AND C. 



Number 



of 



Plat. 



Yield m 



Bushels of 



Shelled 



Corn per 



Acre. 



1908 



Ave. 



Yield of Stover in Pounds 

 per Acre. 



ac 



1903 



1904 



1906 1908 



Ave. 



a) d 3 

 _ o « . 



.a a 



03 U ,• 



0) o r 



tJ ^* N 



e.>s o 



> O 4^ 



^SS 



•5a ■ 



> 



K 



a I. 



O v5 



'»^ 



ao 



fi'~ 19-16 1 29.7 



2629 ; 10.67 



o< 

 O 



o a 

 3 3 



_-.^ 1°:: 



a o 



3 3 



> 



o > 



r^ O t^ 



882 1 $11.00 S 3.82 $ 7. 18 $ 3.65 



or decrease in the natural fertility between check plats and a corrected check was figured on this basis for each 

 treated plat between checks. 



amount, 1-| per cent in the fertilizer mixture, or 4^ pounds per acre. 

 Neither was a very small quantity, % per cent in the fertilizer mix- 

 ture, or 2.2 pounds per acre, as profitable or as effective in increas- 

 ing yields as the normal quantity. 



The indications are that 1^ per cent of potash is all that is 

 needed for corn in this soil when used in connection with the reg- 

 ular quantities of nitrogen and phosphoric acid in the normal corn 

 mixture. 



The results further throw light on the comparative values of 

 nitrogen and potash for corn on this soil and give unquestionably a 

 more important place to nitrogen than potash. 



DELL TEST FARM; EFFECT OF VARYING QUANTITIES OF FERTILIZERS 

 YIELD. 



IN 1903, '04, '06, AND '08. 



Number 



of 



Plat. 



Yield in 



Bushels of 



Shelled 



Corn per 



Acre. 



1908 Ave. 



5« 



7» 



4.8 



13.8 



(52+142) ! 8.3 



15.7 



21.2 



16. 



Yield of Stover in Pounds 

 per Acre. 



e i 



1903 1904 1906 



1650 



1485 



1908 



Ave. 



> m 

 < 





en (U 



<u 



1990 



1965 



1640 



2290 



1200 



1890 



1625 1680 1750 1665 



1620 



1908 



1680 



MO. ■» 



Ua ' 00 



« 36i» 



I 0) OJ (H 



^ > 



l> 



hi 



a 



r" 



n 



O 



c e « 



t- a) o 

 mm 



> OS t. 



3 3 C. 



cs a 0! 



.96 



448 i $ 8.06 $ 1.68 I $ 6.38 



&=3° 



a, CO 03 5 



o O h. 



— ecu 



4^ 03 S^ 

 3 3^ » 

 15 C c8 > 



> 



4.59 



