The lower division of Table I shows the chemical analysis 

 of each form of fertilizer. In the case of the manures and ashes 

 the average of many analyses is taken, and for the prepared fer- 

 tilizer tlje average as determined by the Station from samples 

 collected by the Secretary of the Board of Agriculture. 



Table 11 gives ihe yielus per acre, the value of this yield at 

 fifty cents per bushel ; also the gain over the average of the 

 four plots with no fertilizer; and the value of the gain due to a 

 dollar's worth of fertilizer of each kind. 



r lhat the land on which these experiments were carried on 

 was of uniform quality to start with is shown by the }ield of the 

 plots with no fertilizer, these plots being scattered about over 

 the acre : 



No. 6, no fertilizer, 96 bushels 



No. 12, " 94 



No. 17, ' 9? 



Average, 94. " 



t (Seiies 1.) single elements of plant food. 



Plots 18, 19, 20, show what each of the f 01ms of deficient 

 plant Jvod were able tc cicdute on this soil: Nitrigen alone, in 

 the fcim of sulphate cf ammonia, )ielded ninety bushels, an act- 

 ual loss over plots with no leitilizer; Potash alone, in the lorm 

 of muriate, yielded one hundred and twent)-fcur bushels; Phos- 

 phoric acid alone, in the form of dissolved bone-black, yielaed 

 one hundred and twenty-four bushels. A gain in each case of 

 thirty bushels. 



So far as this series is concerned, we should be justified in 

 concluding that nitrogen was of no use, and that potash and 

 phei-phonc acid are of equal importance, but 1 wish to express 

 my belief that these tests with only one Joint oj plant jood ate of 

 very little if any use, but as they are a part ol almost every 

 scheme of soil testing 1 have always put in a set, more to con- 

 form to the common custom than liom any idea that the) would 

 teach anything of much importance. 



(Series 2.) combinations of two elements of deficient 



PLANT FOOD. 



Plots 3, 4, 5 were designed to show whether either of the 

 three nutritive elements could be dispensed with. 



7 



