23 



TABLE II. 



Influence of Fertilizers on Yield, Color and Growth. 



Epts. 215, 216, 220. 



Plot. 1 



Treatment. 



Yields 1908-9. 

 Lb. 



Per cent. Benefit. 



Yields 1909 

 Third Yr. Lb. 



1 



Per cent. Benefit. 



Per ct. of apples 

 colored }i or 

 more.i 1908-9. 



Per cent. Benefit. 



Ave. increase per 

 tree in trunk 

 girth, in inches, 

 1907-9. 



Per cent. Benefit. 



I 



I 



Check 



4643 1 





1306 





69.2 







3.29h- 





2 



N P 



6887 



*78.i 



1770 



51-2 



47.9 



— 22 



5 



3.54 . 



■8'.9 



3 



N K 



5653 



82.8 



1409 



36.4 



57. 



—14 



5 



3-63 



19. 1 



4 



Check 



2313 





897 





72.7 







3.18 





5 



P K 





62.5 



1441 



56'. 5 



69.8 



I 



7 



3-34 



'3:8 



6 



PK2SO4 



2772, 



32. 



1664 



76.3 



67.2 



3 



6 



3-43— 



5.1 



7 



Check 



1998 





1067 





59. 







3-29 





8 



N P K 



3847 



67*4 



1561 



31-3 



41 .6 



— 20 



3 



3-97— 



l8'.2 



9 



N 



4709 



81.2 



2675 



104.2 



43-8 



— ^21 



I 



4.08 



19.4 



10 



Check 



2898 





1431 





67.8 







3.48 





II 



Acid P. 



2833 



6'. 26 



2126 



52.2 



69-3 



3 



3 



3-49— 



—1.7 



12 



Raw P. 



1548 



-36.6 



1073 



—21.3 



75-3 



II 





3-29 



-8.9 



13 



Check 



2209 





1327 





62.5 







3-68 





14 



Manure 



4793 



138^3 



3423 



178:5 



56.0 



— 9 



I 



4.30 



21 .6 



15 



lyime 



1538 1 



—21.7 



895 



— 21 . 



66.7 





9 



3-73 



9.6 



16 



Check 



1843 





1034 





70.2 







3.26 





Striking things shown here are the strong beneficial effect of 

 manure and of nitrogen on yield and growth, with an accompany- 

 ing harmful influence on color. Plots 6 and 11 show surprising 

 gains in the yields of the third year. Raw phosphate and lime 

 continue to show deficits in every way except in color for the former 

 and in growth for the latter. We can hardly see any reason for 

 this harmful effect in the case of the ''floats" and suspect that it is 

 due to some temporary condition which will disappear later. The 

 same may be true of the lime effect, though the reports of "Lime 

 poisoning" made by Dr. Headdon in Colorado Bulletin 131 are 

 worthy of consideration in this connection. It is also worthy of note 

 that the plots which have made the best yield have also made the 

 best growth, thus showing that reasonable amounts of yield and 

 growth are not antagonistic but rather are associated. 



A puzzling condition appears in the fact that wherever nitro- 

 gen has been applied in combination with other elements, the benefit 

 decreases in a third year, while in plot 9 where it was applied alone 

 the benefit in the third year increases distinctl3^ This is partly 

 explainable in the larger yields of the former plots last year, thus 

 bringing them more strongly under the operation of the biennial 

 bearing habit. 



^In all these tables, the effects on color and size of the frnit were obtained 

 from random samples, taken from the fruit of each tree as it was weighed, 

 the aggregate sample from each plot amounting tisually to one or two 

 bushels. 



