crease, holding out well as is shown by the value of the last 

 crop. Ashes, with one exception, proves to be the most 

 economical fertilizer, thus showing the effect of potash in an- 

 other form. 



Plots I, 8, 9 and lo constitute a series which was planned 

 to show the effect of various combinations in which the nitrogen, 

 phosphoric acid and potash are combined in various ways. 

 Plot I, gives us a total for four crops of $157.43, this plot had 

 no phosphoric acid added, and yet the results are well up to 

 those obtained when phosphoric acid was used. Plot 8, omitt- 

 ed nitrogen, but the aggregate value of the four crops stand at 

 the head ; In plot 9, potash was omitted, and it stands at the 

 foot, being considerably below the plots that received nothing, 

 tiiis may be accounted for by supposing that the sulphate of 

 ammonia used was too strong for the seeds, this preventing 

 germination. Here we have good evidence that the omission 

 of nitrogen in no way interferes with the yield, and if the details 

 of crop on plot (No. 8) are looked at it will be seen that the 

 yield holds out well in the series of crops. 



Omission of phosphoric acid does not seriously cut down 

 the yield during the first three years, but in grass there is a 

 marked falling off. But when potash is omitted the crops fall 

 to the lowest point. Plot 10, has a complete mixture, and if we 

 compare it with 8, it will be seen that one half of the Muriate 

 of Potash in 8 is exchanged for an equal cost of Sulphate of 

 Ammonia in to, the yield in 10 is good, but falls below 8 by 

 ^10.06 in four crops. 



From what has been said it is evident that potash stands 

 first, phosphoric acid second and nitrogen last. In fact we 

 should use nitrogen but sparingly, and only when direct experi- 

 mental work proves it to be profitable. 



Returning to table on page 16 we will study the best six yields 

 of each crop. Plot 8 appears in all of these ; plot 15 appears in 

 corn and hay ; plot 26 appears in corn at the very head of the 

 column, and it is fifth in oats and seventh in hay, but in the 

 column of total values of three years crops, plot 26 leads, with 

 No. 8 next, etc. 



The following table shows the average per cent of nitro- 

 gen, phosphoric acid and potash in the fernlizers which pro- 

 duces the six highest yields of each crop, and of the aggregate 



18 



