26 The Bulletin. 



largest a^'erage increased yields over unfertilized plats (18.8 bushels 

 per acre), than phosphoric acid and potash (1G.5 bushels per acre), 

 and nitrogen, pliosphoi-ic acid and potash were larger than either of 

 the other two (19.1 bushels per acre). This indicates that nitrogen 

 is more important on this soil than potash for corn production. 



Lime, L (Plats 4\ 14", and 7"). Lime was applied at the rate 

 of r»00 pounds rock or 1,000 pounds slaked lime per acre every 

 fourth year. On the plats in Field B during four years there was 

 a profit of 14 cents per acre from the use of lime. On the plats in 

 riehl A there was a loss of $9.10 annually per acre, and on the plat 

 in Field C in one year's test a profit of $G.23, the average for the 

 seven years being a loss of $1.GG per acre. The plat in Field C, 

 where there was a profit from the use of lime, had been in peas after 

 grain during four previous years. 



Lime ivilh Complete Fertilizer N P K L (Plats G^ 15= and 9'). 

 ^"^hen lime was used in combination with the three fertilizer con- 

 stituents there was less corn produced on all the plats in Fields B 

 and A than where the three fertilizer constituents were used with- 

 out lime, but on the plat in Field C, which had previously been in 

 peas and grain for four years, there was a decided gain from the 

 use of lime. As an average of all the tests there was smaller in- 

 creased yield of corn and profit where lime was used than where it 

 was not. 



As an average of all the results, the experiments show — 



(1) That nitrogen alone on this soil for the production of corn 

 was used at a loss; 



(2) That potash alone had practically no effect on the yield and 

 was used at a loss ; 



(3) That nitrogen and potash combined increased the yield very 

 slightly but at a loss; 



(4) That lime alone, except where peas had been previously 

 grown, was used at a loss ; 



(.5) That phosphoric acid alone gave increased yields and profits 

 in all cases, showing that it is the most important constituent for 

 corn production on this soil ; 



(G) That nitrogen combined with phosphoric acid added de- 

 cidedly to the increased yields and profits, the average annual in- 

 crease for phosphoric acid alone being G.2 bushels and for nitrogen 

 and phosphoric acid 18.8 bushels per acre; 



(7) That potash added to phosphoric acid increased the yields 

 decidedly over phosphoric acid alone, the average annual increase 

 for phosphoric acid alone being G.2 bushels per acre, and for phos- 

 phoric acid and potash 1G.5 bushels; 



(8) That potash added to nitrogen and phosphoric acid was at a 

 small increase in yield and without profit; and 



