244 



ANNUAL ItEl'OKT OF THE 



Off. Doc. 



As compared with Tables \I 1 and \'lll, lliese results show a 

 marked leveling elleet from addition of fertilizers. In other words, 

 the applications of plant food have tended strongly to reduce or 

 even uulily the dill'erences due to cultural melhods. This elfect 

 Avas also very distiuct in the appearance of the trees in the field. 



A consecutive increase in i)roductiveness following the addition 

 of plant food has been very marked in some cases. For example, 

 the mulched plots of ICxperiment '2'2\, receiving manure and com- 

 mercial fertilizer, in 1907 produced o,or>0 pcmnds of fruit; in 1908, 

 a.s seen in the table, they i)roduced 10,:>i")l pounds; and in 1909, 22,545 

 l)ounds. And this occurred on plots receiving no tillage. 



FERTILIZATION FOR DIFFERENT CULTURAL METHODS 



The question often arises as to what is the best form of fertilizer 

 to accompany ditlerent cultural methods. This question is par- 

 tially answered by the data in Table X. 



TABLE IX 



Effect of Manures on Yield 



ExptS. 217, 218, 219 



Clean tillage, - 



Tillage and cover crop, 



Sod mulch, 



Sod - 



Totals, - 



Ratios 



13,698 lb. 

 14,.'j50 

 15,702 

 11,706 



55,656 

 100 



21,605 ft. 

 20,582 

 23,678 

 24,772 



90,037 

 162.8 

 110.5 



23,022 ft. 

 20,681 

 20,408 

 17,929 



82,040 

 147.4 

 ICO. 



Expt. 221. 



Tillage and cover crop. 

 Sod mulch, 



Totals, 



Ratios, — 



33,119 

 21,091 



54,210 

 100 



31,924 

 35,396 



67,320 

 124.2 

 105.4 



35,502 

 28,370 



63,872 

 117.8 

 103 



This table shows the influence of fertilizers on yield when used 

 in connection with ditferent cultural methods. It will be observed 

 that in every case except one, the yields from the fertilized plots 

 have surpassed those from the unfertilized. And in the one ex- 

 ception the yields on the corresponding fertilized plots this past 

 year were more than double the yield on it. In total effect, con- 



