442 



ANNUAL REPORT OF THE 



Off. Doc. 



calculations are described briefly in our Bulletin 100 from the Penn- 

 sylvania Station, and described in full in our Annual Keport for 

 1910-11. 



TABLE V. EFFECT OF FERTILIZER ELEMENTS ON YIELD, COLOR, 



SIZE AND GROWTH 

 (Calculated Per cents of Benefit.) 



Expts. 336, 338 & 339 



i 



.c 



-4-) 



if 



o 



o 



Nitrates in combination, .. 

 Phosphates in combination 

 PotHsli in combination, ... 



OomiiJote fertilizer, 



Manure — _ 



Lime alone, 



24.11 



-«.97 



4.17 

 27.50 

 37.49 



8.01 



TABLE VI. FERTILIZER ELEMENTS ON YIELD, COLOR, SIZE AND 



GROWTH 



(Calculated Per cents, of Benefit.) 



Expts. 215, 216 & 220 



c 



Nitrates in combination, .. 



Nitrates alone, -- 



Phosphates in combination. 



Phosphates alone, 



"Floats" alone, 



Potash in combination, ... 



Complete fertilizer, 



Manure, 



Lime alone 



In general, these tables corroborate and extend the deductions ob- 

 tained from those already considered. The addition of the results 

 from the other experiments have reduced the apparent benefits some- 

 what and i^'^ relative values of certain materials are also slightly 

 changed. ^^'8 have included the results of the first year in the yields 

 of Table V, which also reduces the apparent benefits, since the fer- 

 tilizers had not yet had time to operate. Even at that, however, we 

 see that the yields during the 4-year period have been nearly doubled 

 by the addition of nitrates, in experiments 380, 338 and 339 nnd with 

 the same material they have been increased by 41 per cent, in the 

 younger experiments of Table VI. 



