6s 



Table IV. — Influence of Fertilization on Yield and Growth in 

 Experiment 215. 



(Tyson Orchard.) 



(Yields in pounds per plot, 1908-1912.) 



Treatment. 



o o 



1 Check, 14 



2 Nitr. and Phos., .... 26 



3 Nitr. and Potash, . . 43 



4 Check, 21 



5 Phos. and Mur., ... 26 



6 Phos. and Sulf 61 



7 Check, 18 



8 Comp. Fertilizer, ... 21 



9 Nitrogen, 17 



10 Check, 17 



11 Acid Phos., 3 



12 Raw Phos., 4 



13 Check 31 



14 Manure, 15 



15 Lime (and Ftlzr.), . 27 



16 Check, 10 



a'. 

 .5 



a! S>> 



< 



e 



o 



>-> , 



> c 



o a; 

 w 



_C ^ 



O ^ 



O 



95 

 73 

 115 

 54 

 146 

 179 

 45 

 74 

 83 

 89 

 43 

 62 

 46 

 52 

 86 

 76 



346 2,053 



301 2,277 



418 3,043 



260 1,555 



476 2,828 



483 2,352 



235 1,777 



300 2,885 



229 1,746 



150 1,579 



153 1,359 



164 2,010 



103 1,886 



190 2,333 



186 1,765 



115 1,922 



549 3,057 



464 3,141 



542 4,161 



719 2,609 



495 3,971 



975 4,050 



862 2,937 



190 3,470 



551 2,626 



504 2,339 



655 2,213 



842 3,082 



615 2,681 



262 2,852 



1,113 3,177 



739 2,866 



8 



0 



12 



2 



7 



50 



9 



43 



0 



17 



46 





36 



5 



's 



43 



2 



36 



8 



2 



26 



7 



22 



9 



12 



3 



5 



4 



7 



7 



9 



8 



15 



8 



4 



20 



0 



1 1 



4 



0 



4 





4 





14 



13 



4 



13 





I 



As already indicated, the relative youth of these trees make 

 both their yields and differences much less than those in the pre- 

 ceding experiments. With increasing age, it is probable that some 

 of the results may be different, especially in view of the relative 

 grovi^th that is now being made under the different treatments. At 

 present, however, certain facts are of interest. 



In the first place, the practical failure here of both manure and 

 nitrogen is quite remarkable. The regular annual application of 12 

 tons of stable manure, in this case, has resulted in an annual gain of 

 less than 4 bushels of apples per acre. During the same time, 

 nitrogen alone has shown no gain at all, and nitrogen and phos- 

 phates, which were so effective in the preceding experiments, here 

 show an annual gain of only 12 bushels per acre, — not enough to pay 

 for the treatment. 



Potash on the other hand, in direct contrast to its effect in the 

 experiments above, here shows a distinct gain in yield wherever it 

 is applied. The best of these gains, — in combination with nitrogen, 

 is only 43 bushels per acre annually, but this is more than a 50 per 

 cent, increase over the normal yield, and it shows a fair profit over 

 the cost of treatment, besides giving over 17 per cent, of an in- 

 crease in growth. Potash applications therefore, have evidently 

 been of value in this orchard, even when those of manure and 

 nitrogen and phosphates were largely failing. 



