BARLEY. 79 



plots. The first column gives the results for the four plots 

 of Series 1, without nitrogenous manure ; the second column 

 those for Series 2, with ammonium-salts equal to 43 lb. 

 nitrogen per acre per annum ; the third those for Series 3, 

 first with ammonium-salts and afterwards sodium nitrate ; 

 and the fourth those for Series 4, with rape-cake. The 

 upper division of the table gives, for each plot, the average 

 produce of grain per acre in bushels; the middle division 

 the average produce of straw in lb. ; and the lower division 

 the average total produce (grain and straw together) in lb. 



Referring first to . the results on the four plots without 

 nitrogenous manure, as given in the first column of the 

 table, it is seen that plot 2 with superphosphate, and plot 4 

 with superphosphate, and potassium, sodium, and magnesium Phosphates 

 sulphates, give considerably more produce than plot 3 with °: nd a B? l ~ 

 the potash, soda, and magnesia, without phosphate. There is nitrogen. 

 more of straw as well as grain, and of course, therefore, of 

 total produce, with than without the phosphate. There is, 

 indeed, very marked effect by phosphatic manure, and very 

 little by the alkalies. 



The second column, with the same four conditions as to 

 mineral supply, but with, in each case, 43 lb. of nitrogen per with 

 acre per annum as ammonium-salts, shows a very great nitro 9 en - 

 increase. Even with the ammonium-salts alone there is a 

 great increase ; there is somewhat more on plot 3, where the 

 alkalies are also applied, but very much more still on plot 2, 

 where superphosphate, and on plot 4, where alkalies and 

 superphoshate, are also used. 



The third column shows that, with a larger amount of Greatest 

 nitrogen supplied in the first six years, and with sodium f^^itro- 

 nitrate instead of ammonium-salts in the later years, there is gen and 

 still greater increase ; and again, the increase is by far the Si ^ er i >Aos - 



o i ? ■ • l pliate. 



greater where the superphosphate is used. 



The four plots of Series 4, with the rape-cake, show a Rape-cake 

 much greater uniformity of result with the different mineral °^ n ^ s r 

 manures. Still, the two phosphate plots (2 and 4) give more 

 produce than the two without phosphate. Eeferring to the 

 produce of grain in illustration, it is seen that plots 1 and 3 

 with rape-cake without superphosphate, give considerably 

 more produce than the same plots (1 and 3) in either Series 

 2 with the ammonium-salts, or in Series 3 with sodium 

 nitrate. The explanation of this is that the rape-cake itself 

 contains phosphates. On plots 2 and 4, on the other hand, 

 where phosphates are added, there is about as much produce 

 in Series 2 with the ammonium-salts, and more in Series 3 

 with the nitrate, than in Series 4 with the rape-cake. 



Thus, then, whilst there is evidence that the phosphate of 

 the rape-cake was effective when none was otherwise supplied, 



