46 



Table V. Ei^:?e:ct oi^ Fkrtilizkr ElEmi^nts on YikIvD, C01.OR, 

 SizK AND Growth. 



(Calculated Percents of Benefit.) 





Yield 



Color 



Size 



Growth 



Expts. 336, 338 & 339 



1908-11 



: 1911 



1909-11 : 



: 1909-11 



1908-11 





Per Ct. 



Per Ct. 



Per Ct. 



Per Ct. 



Per Ct. 



Nitrates in combination, . . . 



94.05 



1G3.1 



—13.3 



—4.81 



24.11 



Phosphates in combination, . 



36.65 



35.8 



—.95 



4.04 



—3.97 



Potash in combination, . . . . 



—4.65 



—6.42 



—.1 



13.2 



4.17 



Complete fertihzer, 



122.5 



166.4 



—16.0 



5.93 



27.50 



Manure, 



144.1 



169.8 



—14.3 



30.8 



37.49 





19.5 



—3.07 



—2.9 



19.4 



8.04 



Table VI. Fi:rtii,izer EivEmknts on Yikld, Color, Size and 



Growth. 



(Calculated Percents of Benefit.) 





Yield 



Color 



Size 



Growth 



Expts. 215, 216 & 220 



1908-11 



1911 



1908-11 



1908-11 



1907-11 





Per Ct. 



Per Ct. 



Per Ct. 



Per Ct. 



Per Ct. 



Nitrates in combination, . . . . 



41.7 



18.05 



—12.35 



—1.67 



14.83 



Nitrates alone, 



30.0 



39.10 



—16.00 



—6.23 



18.33 



Phosphates in combination, . 



15.4 



9.35 



—1.55 



.925 



.62 



Phosphates alone, 



—7.4 



-7.37 



2.80 



—1.21 



.52 



"Floats" alone, 



—18.8 



6.4 



7.70 



—1.92 



—6.00 



Potash in combination, 



15.2 



12.80 



6.55 



5.67 



2.71 



Complete fertilizer, 



68.8 



65.7 



—16.00 



4.30 



19.10 





101.— 221.90 



—9.90 



4.73 



24.70 



Lime alone, 



—12.0 



15.1— 



.8 



—1.05 



3.1 



In general, these tables corroborate and extend the deductions 

 obtained from those already considered. The addition of the results 

 from the other experiments have reduced the apparent benefits 

 somewhat and the relative values of certain materials are also slight- 

 ly changed. We have included the results of the first year in the 

 yields of Table V, which also reduces the apparent benefits, since 

 the fertilizers had not yet had time to operate. Even at that, how- 

 ever, we see that the yields during the 4-year period have been 

 nearly doubled by the addition of nitrates, in experiments 336, 338 

 and 339 and with the same material they have been increased by 

 41 per cent, in the younger experiments of Table VI. 



Phosphates, when used in combination with nitrogen or in a 

 complete fertilizer, maintain their position as the next limiter after 

 nitrogen, though they are closely pressed by potash in Table VI. On 

 the other hand, neither acid phosphates nor ''floats" nor lime, when 

 used alone, have shown any consistent benefits on yield thus far. 

 Their apparently negative influences on yield may be smoothed out 



