66 



STATE POMOLOGICAL SOCIETY. 



experiments. Practically no fruit had been borne by these 

 trees when our experiment was started in 1907, and there have 

 been but two fairly full crops since then, — those of 191 1 ana 

 1913. The treatments are the same as those in the Brown 

 experiment and the results are shown in Table IV. 



TABLE IV.— INFLUENCE OF FERTILIZ.4TION ON YIELD AND GROWTH IN 

 EXPERIMENT 21.5. (TYSON ORCHARD) 



Yield in pounds per plot, 1908-1913. 



Treatment. 



■ D S U 



I S S '- 



OJ o ^ 



S t. 



1 Check 



2 Nitrogen and phosphate 



3 Nitrogen and potash . 



4 Check 



5 Phosphate and muriate 



6 Phosphate and sulphate 



7 Check 



8 Comp. fertilizer 



9 Nitrogen 



10 Check 



11 Acid phosphate 



12 Raw phosphate 



13 Check 



14 Manure 



15 Lime (and fertilizer). 



16 Check 



14.6 

 41.8 



45.4 

 37.1 



49.7 



17.8' 



-3.4 

 2.2 



16.3 

 -2.0 



34.5 

 68.4 



59.0 

 36.0 



50.2 

 6.5 



-8.4 

 9.1 



.41.3 

 6.5 



7.4 

 17.7 



8.1 

 2.3 



12.7 

 7.9 



4.4 

 0.8 



14.6 

 -1.6 



Average Check equals 6501 lbs. for 6 years and 6415 for last 4 years or 154 bushels 

 per acre for last 4 years. 



The relative growth of these trees makes both their yields 

 and differences much less than those in the preceding experi- 

 ments. With increasing age, it is probable that some of the 

 results may be different, especially in view of the relative 

 growth that is now being made under the different treatments. 

 At present, however, certain facts are of interest. 



In the first place, the comparative failure here of both ma- 

 nure and nitrogen is quite remarkable. The regular annual 

 application of 12 tons of stable manure, in this case, has re- 

 sulted in an annual gain of less than 15 bushels of apples per 

 acre. During the same time, nitrogen alone has shown, and 

 nitrogen and phosphates, which were so eft'ective in the pre- 

 ceding experiments, here show an annual gain of only 34.5 

 bushels per acre, — but little more than enough to pay for the 

 treatment. 



