164 TwBNTY-FlEST BlENNIAL RePOET 



In 1912-13 we conducted an extensive series of fer- 

 tilizer experiments on wheat sown on corn ground on 

 the Experiment Station farm. We used a complete fer- 

 tilizer made as follows : 



72 lbs. acid phosphate, furnishing 10 per cent, phos; 



phoric acid. 

 8 lbs. sulphate of potash, furnishing 4 per cent, potash. 



10 lbs. dried blood 1 » . , . r, a -i 



10 lbs. nitrate of soda Ki^rnishing 3 per cent, nitrogen. 



100 lbs. 



This fertilizer was used at the rate of 100, 200, 300 

 and 400 pounds per acre, each rate of application being 

 repeated on three different plots. Another fertilizer was 

 made containing the above amounts of nitrate of soda 

 and dried blood, but dry soil was used to replace the 

 acid phosphate and potash. This was applied a;t the 

 same rates, and repeated as above, all applications be- 

 ing made when the wheat was sown. This gave 24 fer- 

 tilized plots. The average yield of all these plots was 

 21.4 bushels per acre. Six plots were left untreated, the 

 average yield of which was 21.4 bushels per acre. Three 

 plots were treated with only nitrate of soda as a top 

 dressing in the spring at the rate of 100 lbs. per acre. 

 This gave an average yield of 31.9 bus. per acre, an in- 

 crease of 10.5 bus. per acre. Phosphorus and potassium 

 gave no increase and the fall application of nitrogen 

 gave no increase. This is a fair basis for not recom- 

 mending the use of fertilizer containing nitrogen on fall 

 sown grain. This and other data presented are a safe 

 basis for the conclusion that on the highly phosphatic, 

 well-drained soils of Central Kentucky the application 

 of phosphates and potash is not profitable. 



The loss of nitrogen applied to fall sown grain is 

 confirmed by an experiment on the Eussellville experi- 

 ment field. In 1914 tobacco experiments were laid out 

 in which the effects of nitrogen in nitrate of soda, dried 

 blood and sulphate of ammonia were to be studied. Ni- 

 trate of soda was used at the rate of 100 lbs. per acre, 

 while dried blood and sulphate of ammonia were used in 



