56 . QUEENSLAND AGRICULTURAL JOURNAL. [1 Jan., 1899. 
' FERTILISER EXPERIMENT ON SUGAR-CANE UPON A Pretty Licut Son. 
By J. D. Kobus,* Madjoagoong Sugar Factory, Java. 
: Sugar ob- Analysis of Juice. 
No, ; Weight of |tained from| 
of Fertilisers Applied per Acre in lb. Cane from } 1 Acre at | 
te WN ip Der can a Brix. Sugar. | Purity. 
lb. lb. per cent. | per cent.| per cent. 
1 | No fertiliser ... = i 49,684 6,381 18°80 18°0 95°67 
2 | 224 lb. sulphate of ammonia 74,915 8,423 17°95 16°46 91°70 
3 | 449 ,, Fs op 87,336 9,782 17°38 16°16 92°98 
4 > |.637 ,, tr: 1 1 97,816 9,580 16°30 14°65 | 90°0 
_* Archief voor de Java-Suikerindustrie, 1896, dag., 105. 
A triple quantity of nitrogen produced a decrease in the contents of sugar 
in this, and also in the previous experiment. The largest quantity of sugar 
was obtained from the application of a double amount of nitrogen. An appli- 
cation of 673 1b. sulphate of ammonia per acre is excessive and seldom pays. 
PouDJEDJER SuGaR Factory (Licut Gravenry Som wire Rocky Sussort). 
Sugar ob- Analysis of Juice, 
No. Weight of |tained from 
Fertilisers Applied per Acre in Ib. Cane from | 1 Acre at 
Plot. lAcre. |75 per cent. 4 4 
Pressure. Brix, Sugar. | Purity. 
: Tb. Tb. per cent. | per cent, | per cent. 
1 | No fertiliser le: _ 65,598 7,880 19°0 17°54 92°86 
2 | 157 lb. sulphate of ammonia 8,345 9,813 18°6 16°66 89°79 
3 BY 5) 3 ¥) 100,688 11,567 18°0 16°70 92°50 
4 |472,, 53 a3 y) 89,043 11,427 19'7 18°32 93°25 
The triple quantity of sulphate of ammonia upon this soil produced no 
increase in the yield of cane ovcr the single quantity; the former did not, 
however, decrease the amount of sugar. 
TyorKir Sucar Factory (Sanpy, GRAVELLY Sor, with Compact SvuBSOIL). 
Sugar ob- Analysis of Juice. 
No. Weight of (tained from 
of Fertilisers Applied per Acre in Ib. Cane from | 1 Acre at 
Plot l Acre. 75 per cent. , 
Pressure. Brix. Sugar. | Purity. 
i lb. lb. er cent, | per cent. t. 
1 | No fertiliser Tab ve 126,151 12,732 eeeT3 R 559 *8; “93 
2 | 157 lb. sulphate of ammonia 123,279 10,954 | 16°25 | 14°05 | 86-46 
3 D 55 ” ” ” 121,648 10,923 16.70 14°35 85°93 
4 |472,, ef) 9 ” 125,847 11,528 16°73 14°47 86°49 
KLOERAHAN Sucar Facrory (Loamy, Graveniy Sorn). 
1 | No fertiliser i. ae 94,633 8,105 16°6 14°14 85:18 
2 | 157 1b. sulphate of ammonia 104,569 8,982 | 16°5 13°98 | 84°73 
3 Ti it ts vi 106,898 8,586 161 13°71 85:15 
4. | 472.,, -E: + cf 107,209 8,446 15 9 13°41 84°34 
} 
Both of these fields produced large yields, even on the unfertilised plots: they must have 
been rich in nitrogen, for the application even of larger quantities of that ingredient produced no 
beneficial results. 
In these experiments, half of the plots were manured with 39 lb. double 
superphosphate (45 per cent.) per acre, in order to determine the effect of 
phosphoric acid upon the formation of sugar. It was found that the 
phosphoric acid neutralised the deleterious effect produced by the excessive 
