54 QUEENSLAND AGRICULTURAL JOURNAL. [1 Jan., 1899. 
The above figures indicate that—. 
1. The yield of cane increases in proportion to the amount of nitrogen. 
2. The application of potash and phosphoric acid, together with large 
quantities of earth-nut cakes, did not produce a further increase in the yield ; 
however, where the amount of nitrogen was smaller, an increase resulted. 
3. The beneficial effect of earth-nut cakes is to be ascribed not only to the 
nitrogen they contain, but also to the potash and phosphoric acid, as 1,180 lb. 
of earth-nut cakes contain 18 lb. of potash and 15 Ib. of phosphoric acid. 
4. The addition of potash and phosphoric acid to carth-nut cakes produced 
a decidedly beneficial effect in the formation of sugar, and caused the highest 
yield of sugar (Plot 20). 
Sugar ob- Analysis of Juice at Medium 
No. Weight of |tained from Pressure of 73°6 per cent. 
ot Fertilisers Applied per Acre in lb, | Cane from | 1 Acre at an — 
Plot. 1 Acre. 75 per cent. 
Pressure. Brix. Sugar. | Purity. | Glucose. 
Ib. Ib. Per cent.| Per cent.| Per cent.| Per cent. 
1 | 236 1b. sulphate of ammonia ...| 73,743 6,060 18°8 14°88 791 1°73 
(| 236 ,. sulphate of ammonia ... |) 
| 31'5,, acid phosphate (20 per | 
cent, )i) os re i ; 
24 | 35°4,, sulphate of potash (96 | }72,799 7,201 19°3 | 16°24 84:1 | 1:04 
| per cent.) $F Se: 
11°8,, sulphate of magnesia 
L (70 per cent.) ee) 
1A | 236 lb. sulphate of ammonia ...| 83,738 7,870 194 | 15°98 82°3 | 1°35 
sulphate of ammonia ... 
( ) 
| 315, acid phosphate (20 per | 
cent.) 2. ae ie 
2a+4|35°4,, sulphate of potash (96 | }91,451 9,680 19°6 | 16°88 86-1 | 0°96 
U J 
- per cent.) iy Jose 
11°8,, sulphate of magnesia 
(70 per cent.) ae 
These figures indicate that, while the addition of potash and phosphoric 
acid scarcely increased the yield of cane, the beneficial effect upon the forma- 
tion of sugar was so marked, as to cause a large excess of sugar over the 
quantities obtained from the plots fertilised with nitrogen alone. 
Additional results huve been obtained from experiments carried out in 
British Guiana* and collected in the following table :— 
Percentage of Increase over 
Unfertilised Plot. 
Plot. _ Fertilisers Applied per Acre in lb. 
With 11,150 lb. 
Slacked Lime Without Lime. 
per Acre. 
a Per cent. Per cent. 
1 | No fertiliser ... ay. a 7 ve 
z mane Ib. Hea aati , + 14'8 + 214 
6 stable-manure ' , 
: 2p i Suiphate of ammonia el +196 + 245 
sulphate of potas ” K 
Booearitichoenhata \ See ys + 137 + 455 
5 245 ,, sulphate of ammonia ... Fed af ee. + 175 + 18°0 
: a if) arate of pode i ws Si] Fr aid + 22'9 + 20°38 
sulphate of ammonia + 18°0 + 20°0 
8 303 ee nitrate of soda i ar Re renee +181 + 19°8 
9 366 ,, sulphate of ammonia <a arttatenh + 21°5 + 25°8 
10 455 ,, nitrate of soda Hate Onreaek ‘of + 18:2 + 21°5 
11 491 ,, sulphate of ammonia | P th a o + 22°7 + 30°5 
12 607 ;, nitrate of soda J eta + 153 + 20'8 
~~~ Unfortunately, no exact analyses of the juice were made in this instance. 
The experiment shows that the,application of very large quantities of stable- 
manure produces an increase inthe yield of vane, though this increase is not 
* « Sugar Cane,” 1894, p. 505. 
