27 



It is to be noted that the net gains are obtained after deducting 

 both the cost of the fertiHzer and the value of the unfertiHzed crop, 

 also the fruit here is valued at 50 cents per bushel, while the actual 

 prices obtained for it varied from 50 cents to $1.25 per bushel; and 

 any increase in the appraisement of the fruit of course will propor- 

 tionately increase the net gain. It is also to be noted that variations 

 in the factors of tillage, spraying and pruning produced no material 

 effect on the size of the crop, since the treatment of all plots in 

 these respects was uniform. 



Figure i. 



ROW 

 B A 



PLAT I 



II 

 111 

 TV 

 V 

 VI 



vn 



IX 



X 



XI 



XH 



XUI 



XIY 



XV 



XYI 



CHECK 



NITROGEN & PHOS. 

 NITROGEN & POTASH 

 CHECK 



PHOS.& POTASH (KCI) 



PM05.& KaSO^ 



CHECK 



N.P.K 



NITROGEN 



CHECK 



p(acidrocK) 

 p (raw roc»^ 



CHECK 



STABLE MANURE. 



LIME 



CHECK 



Such striking results as these of course are not to be expected 

 everywhere. They evidently occurred here because plant food was 

 the crop limiter in these orchards. For any given case this can only 

 be determined by experiment. These orchards are on three diverse 

 soil types. The soil in one case was evidently "run down" ; in an- 

 other case it was in average condition ; and in the third the soil con- 

 dition was apparently above the average. These orchards are from 

 21 to 37 years of age, and they are the only ones under experiment 

 above 20 years old. Age, however, is not a sure index of the need 



