NITROGENOUS FERTILIZERS FOR TOBACCO 



11 



operation. From 1932 to 1935, inclusive, the experiment was conducted with 

 the modified planter, with results shown in Table 7. The results for the 

 preliminary period were in general agreement with those of 1932 and 1933. 



This experiment was so laid out that a check plot on which the fertilizer 

 was broadcast was adjacent to each plot on which fertilizer was applied in the 

 row. These plots were in quadruplicate but were only one eightieth of an 

 acre in size. Previous to this experiment the field had been used for tobacco 

 experiments in which all the fertilizer was broadcast at the rate of 3,500 

 pounds per acre. There was, therefore, a fertilizer residue in the soil, which 

 no doubt influenced the results of the present experiment. The fertilizer used 

 was the standard mixture referred to in the other experiments, and contained 

 5 percent nitrogen, 4 percent phosphoric acid, and 5 percent potash. The 

 rate of application on the check plots was 3,500 pounds per acre, and the 

 row-treated plots received fractions of this amount as indicated in Table 7. 



For the first two years in which the fertilizer was applied by machine (1932 

 and 1933 , the average crop index of tobacco from all row applications slightly 

 exceeded the average from all broadcast treatments. Beginning with 1934, 

 which was the fifth year of the experiment as a whole, the broadcast treat- 

 ments produced best results. In 1932 and 1933 comparable experiments were 

 conducted on near-by private farms, and the results closely paralleled those 

 obtained on the station plots. 



Table 7. — Effect of method of fertilizer 



GRADE of tobacco 



Year Treatment 



APPLICATION ON YIELD AND 



1932^ 



1933 



1984 



1985 



4 8 Standard amount in row 

 Standard amount broadcast (check) 



5 8 Standard amount in row 

 Standard amount broadcast (check) 



6/8 Standard amount in row 

 Standard amount broadcast (check) 



4 8 Standard amount in row 

 Standard amount broadcast (check) 



5 8 Standard amount in row 

 Standard amount broadcast (check) 



6 8 Standard amount in row 

 Standard amount broadcast (check) 



4 8 Standard amount in row . 

 Standard amount broadcast (check) 



5 8 Standard amount in row 

 Standard amount broadcast (check) 



6 8 Standard amount in row 

 Standard amount broadcast (check) 



4 8 Standard amount in row 

 Standard amount broadcast (check) 



5 8 Standard amount in row 

 Standard amount broadcast (check) 



6,8 Standard amount in row 

 Standard amount broadcast (check) 



