)0 



The Bulletin. 



Table V— 



AVERAGE RESULTS FOR SEVEN 



Number 



of 



Plat. 



(5»+14')- 

 18-82 



7J_20-12 



(52+142)- 



(4+ll)-8 



10'-8-6 



(5»+14»)- 



42-82 



8J_12_22 



(5'+14')- 

 42-8= 



91-2^-32 



Fertilizer Application per Acre. 



o 



o ^ 



c >- 



go- 



Unfertilized^ 0= 



34.6 pounds 13% blood=... }^N= 



75 pounds 14% acid phosphate= /^P^ 



11.2 pounds 20% manure salt=^- J^K^ 



Unfertilized^ O^ 



69.2 pounds 13% bloods ..- N= 



150 pounds 14% acid phosphato=.-- P== 



22.5 pounds 20% manure salt^ K= 



Unfertilized^ - 0= 



103. S pounds 13% blood= 1J4N= 



225 pounds 14% acid phosphate= IHP^ 



33.7 pounds 20% manure salt= 1/^K= 



4.5 



13.5 



o t- 



(1. 



10.5 



J3 

 tr. 



o 



a, . 



"1^ 



o ^ 



Yield in Bushels 



of Shelled Corn 



per Acre. 



1903 



21 



2.2 



4.5 



Unfertilized=. 



.0=1 



138.4 pounds 13% blood=- 2N-= 18 



{ 300 pounds 14% acid phosphate= 2P= 



45 pounds 20% manure salt= - .2K^ ; 



31.5 



6.7 



42 



1904 1906 



The check for plat 8, Field A, has been obtained from plats 4 and 11; that for plat lO^, Field B. from plats 

 52 and 142, and for plats 7', b', 9' and 10^, Field B, from plats 5' and W. It has been assumed that there is a 



EFFECT OF VARYING QUANTITIES OF FERTILIZER ON YIELDS. 



The tests in Table V were arranged to show the effect of in- 

 creasing and decreasing the normal fertilizer application on yields, 

 the normal (NPK) being 300 pounds of a mixture containing 7 

 per cent phosphoric acid, 3 per cent nitrogen and 1^ per cent potash. 

 The applications were at the rate of 150 pounds per acre (^ N P K) ; 

 300 pounds per acre (N P K) ; 450 pounds per acre (1^ N P K) ; 

 600 pounds per acre (2 N P K) ; 750 pounds per acre (2A N P K). 

 The results in all the fields show increased yields and profits for all 

 the quantities of fertilizer. The amount of fertilizer varied from 



