32 



This table shows the influence of manures^ on yield when used 

 in connection with different cultural methods. It will be observed that 

 in every case except one, the yields from the fertilized plots have sur- 

 passed those from the unfertilized. And in the one exception the 

 yields on the corresponding fertilized plots this past year were more 

 than double the yield on it. In total effect, considering all treat- 

 ments, the fertilized plots show a nice per cent of increase over the 

 unfertilized ; and the stable manure at the rates applied shows a 

 small gain over the commercial.^ 



Examining the data still more closely, we see that in every 

 case on the tilled plots commercial fertilizer has surpassed the 

 manure, while on the untilled plots the reverse is true. In other 

 words, the present data indicates that, from equal values of manure 

 and a proper commercial fertilizer the best results are obtained by 

 using the manure on sod or mulch areas, and reserving the fertilizer 

 for use in connection with tillage. Either material, however, may 

 be used satisfactorily and it is very probable that in any case a more 

 or less regular alternation can be made more successful than any 

 thing else. 



^The complete commercial fertilizer is here included under the term 

 "manure." 



"Twelve tons of average stable manure are estimated to contain about 120 

 pounds each of nitrogen and potash (K2O), and about 80 pounds of phos- 

 phorus pentoid (P2()5). The relative cost per acre, as applied, is about $15 

 for the manure and $13 for the commercial fertilizer. 



TABLE X. 



Effect of Manures on Color, Size and Growth. 



A. Expts. 217, 218 and 219. (a) Color. Per cent. Apples colored ^ or more. 





Unfertilized. 



Stable 

 Manure. 



Com. 

 Fertilizer. 





71 .2 



61.9 

 —9.3 



62.4 

 —8.8 



(b) Size. Average weight of apples. 





4.71 

 100. 



4.99 

 106. 

 100. 



5.25 

 III. 5 

 105.2 





(c) Growth. Increase in Trunk-girth. 



Average Increase, inches, 



Ratios, 



4.12 

 100. 



4-3 

 104. 1 

 100. 



4.43 

 107.5 

 103. 





B. Expt. 221. 1908-9. (a) Color. Per cent. Apples colored >^ or more. 



Per cent. Benefit, 



72.5 



68 I 

 —4.4 



73.5 

 I. 



(b) Size. Average weight of apples. 





4.89 



100. 



no. 8 



5.33 

 109. 



(c) Growth. Average Increase in Trunk-girth. 





4.22 



100. 



5.86 



139 

 119. 1 



4.92 

 116. 6 

 100. 





