162 



TwEWTY-FntST BlEWWIAL. EePOET 



Q,n an experiment field at London, Laurel oounty, 

 Ky., the following results have been obtained: 



Yields Per Acre — London Experiment Field — Continued. 



Treatment 



Pounds Soy Bean 

 and Oowpta Hay 



1912 |1913 I 1914 |Ave. 





1914 



of 

 Crops 



m u 

 o o 





Nothing 



Acid Phosphate 



Acid Phosphate and Limestone- 

 Potash 



Acid Phosphate and Potash 

 Acid Pijps;, Pot. and Limestone 



1197 

 1650 

 3213 

 1613 

 2860 

 2757 



290 

 860 



3300 

 170 



1740 



$72.99 

 119:04 

 202.74 

 80.25 

 174.63 

 178.56 



$17.60 

 35.20 

 30. 

 47.85 

 65.45 



(28.45 

 94.55 

 22.99 

 53.79 

 40.12 



♦Loss. 



This field is located at the base of the coal measures 

 in the western part of the Eastern Coal Field, and rep- 

 resents a limited area of agricultural lands. This soil 

 contains 17,600 lbs. of potassium in the first. 7 inches 

 of an acre. 



It wiir be observed that potash alone gave practi- 

 cally no increase in most cases, that acid phosphate and 

 potash gave a more profitable increase than acid phos- 

 phate alone, but that by far the most profitable increase 

 was by the use of limestone and acid phosphate. Unfor- 

 tunately, the acid phosphate-lime-potash plots are on 

 thinner ground than the others, and it remains yet to be 

 seen whether potash will put them ahead of acid phos- 

 phate and limestone. 



These results lead one to suspect that the effect of 

 potash on the acid phosphate-potash pTots may be due 

 to the potash rendering the phosphate more available. 



