168 Twenty-First Biennial Eepoet 



The following results on tobacco in 1914 on the sam^ 

 soil speak for themselves : 



Plot 



TREATMENT 



Founds 

 Per Acr» 



214 

 215 

 216 

 217 

 218 

 219 

 220 

 221 



Limestone and acid phosphate ^ 



Limestone and potash 



Limestone, acid phosphate and nitrate of soda 



Nothing 



Limestone, potash and nitrate of soda 



Limestone, acid phosphate, potash and nitrate of soda 



Acid phosphate, potash and nitrate of soda — - 



Limestone, acid phosphate, potash and double ap 

 plication of nitrate of soda.... 



1235 

 7,60 



1595 

 575 

 580 



1410 



1625 



1600 



The clover and tobacco were on better drained soil 

 than the wheat. There is a possibility that potash may 

 have affected the quality of tobacco on plot 220, which 

 graded a little higher than the other plots. 



The significant thing in these results is that no ma- 

 terial increase could be made in the absence of phosphate. 

 Potash seems to have given little or no increase (com- 

 pare plot 216 with plots 219, 220 and 221), but nitrate of 

 soda gave a profitable increase after phosphate had been 

 added. The tobacco was the first crop in the rotation 

 of tobacco, potatoes and clover, so there had been no 

 chance to restore organic matter and nitrogen to the soil 

 by the use of clover. As stated, there is some evidence 

 that potash improved the quality of the tobacco, although 

 it is not altogether conclusive. More work will be re- 

 quired to determine this point. On a crop like tobacco, 

 worth $8 to $10 per 100 pounds, one can a:6Ford to use 

 expensive treatments that will increase the yield as much 

 as 100 to 200 pounds per acre. The same ratio of in- 

 creases on the ordinary farm crops must be produced 

 very cheaply to be profitable. 



At Eussellville on the 1914 wheat crop potash gave 

 no increase, while acid phosphate gave an average in- 

 crease of 8.3 bushels per acre. 



At Lone Oak, McCracken County, the soil was so 

 badly worn and the season so dry that there was no ap- 

 preciable effect of either acid phosphate or potash on 

 the wheat. 



