43 



only 16 per cent, of the value of the nitrogen in nitrate of 

 soda. 



The barley experiment yields a better result. Here we 

 have 1,128 Ibs. of nitrogen as food and litter producing in 

 twenty years 152 bushels of barley, or 135 bushels per 

 1,000 Ibs. of nitrogen. On plot 6, the nitrate of soda yielded 

 during the same years 427 bushels per 1,000 Ibs. of nitrogen. 

 The nitrogen of the food thus had 32 per cent, the value of 

 the nitrogen of nitrate of soda. 



In summing up these results let us confine ourselves to 

 those obtained with one crop, namely, barley. When powdered 

 cake is applied directly as a manure for barley, and is ploughed 

 into the ground before sowing, the practical effect of the 

 nitrogen it contains is about 80 per cent, of the effect of the 

 same quantity of nitrogen applied as nitrate of soda. When 

 the cake is consumed by sheep feeding off turnips, its effect on 

 the following barley is about 46 per cent, of that of the same 

 quantity of nitrogen as nitrate of soda applied directly to the 

 barley. When cake and other foods are consumed by fattening 

 bullocks in deep stalls or boxes, the manure left undisturbed 

 till the feeding is completed, then clamped, and finally applied 

 as a top dressing in a well-rotted condition, the return in 

 barley is about 20 per cent, of that yielded by the nitrogen of 

 nitrate of soda ; this return may rise to about 30 per cent, if the 

 effect of the residue in fifteen successive years without manure 

 is taken into the account. 



Nitrate of soda contains about 350 Ibs. of nitrogen per ton. 

 At its present price of 7. 15s. per ton, a pound of nitrogen is 

 worth 5*3 pence. A pound of nitrogen in oil-cake is thus worth 

 as a manure for barley 4-2 pence if applied directly to the 

 crop ; 2-4 pence if consumed by sheep on the land ; and one 

 penny if given to fattening bullocks in boxes, and the manure 

 applied to the land. We have no experiments showing the 

 manuring effect of food consumed in an open yard, or in 

 stables where much of the liquid portion of the manure runs 

 to waste. The final manuring value of cake consumed under 

 such unfavourable conditions will be very low, perhaps not 

 more than one halfpenny per pound of nitrogen in the cake. 



These values for nitrogen do not express the whole manuring 

 value of the cake, which is to a less extent due to the phosphates 



