35 



Cross-dressings. 



Plot 



Nitrate of Sodium, 

 86 ib. nitrogen. 



Ammonium Salts, 

 80!b. nitrogen. 



Rape-cake 

 961b. nitrogen. 



Ammonium Salts, 

 etc., Rape-cake 

 1841b. nitrogen. 



1 



2 



per cent. 

 515 

 653 



per cent. 

 543 

 61-9 



per cent. 

 45-5 

 4v3 



per cent. 

 451 

 470 



These corrected estimates still show a very good return from the use 

 of nitrate of sodium and ammonium salts when applied to land receiving 

 farmyard manure ; this is especially the case on plot 2. where super- 

 phosphate was used. 



In the figures just given we have had to use an approximate esti- 

 mate of the nitrogen in the leaves in the absence of actual determina- 

 tions ; we may, however, arrive at a practical conclusion as to the effi- 

 cacy of nitrates, etc., when applied with farmyard manure, without taking 

 the leaves at all into consideration. Below is a comparison of the average 

 ieturn of nitrogen in the mangel roots only given by nitrate of sodium r 

 ammonium salts, and rape-cake, when used both with and without farm- 

 yard manure. It is clear that if the nitrogen of these three manures is 

 utilised to the same extent under the two conditions named, we shall have 

 good ground for concluding that the farmyard manure has had no pre- 

 judicial influence upon their action. The figures given are the average 

 for the same six years already mentioned. 



Cross-dressings. 



Standard Manures. 



Nitrate of 

 Sodium. 



Ammon- 

 ium Salts. 



Rape- 

 cake. 



| Ammon- 

 j ium Salts 

 jand Rape- 

 i cake. 



Nitrogen Recovered in increase of Roots for 100 in Cross-dressing. 



Farmyard manure and super- 



phospate 

 Superphosphate and potassium 



sulphate 



544 

 58' I 



45-2 

 44-5 



409 

 51-8 



35 5 

 45-5 



Leaf to 1,000 of Root. 



Farmyard manure and supher- 



phosphate 

 Superphosphate and potassium 



sulphate 



I 



193 

 169 



260 

 186 



176 

 148 



255 

 235 



