SUGARCANE VARIETY P.O.J. 2S7S IX PUERTO RICO 
25 
experienced in [sabela is, however, not entirely one of varieties, but 
is partly that of a rational application of water in a newly opened 
irrigation district. 
GRAN-CULTURA TRIALS AT CENTRAL PAGAN 
B.H. 10(12) is the major cane variety on the Central Pagan proper- 
ties of Russell & Co. Considerable of the soils there have a good 
granular structure and are well adapted to that variety. Mosaic 
spreads very rapidly there and owing to the expense of roguing the 
susceptible B.H. 10(12), a mosaic-resistant cane is badly needed. 
Some P.O.J. 2725 has been grown, but is unsatisfactory because of 
its objectionable habit of early arrowing. Reports are available on 
general field results in 1931-32 and on three variety trials in which 
P.O.J. 2878 was planted in checkerboard fashion with B.H. 10(12). 
In every trial there were four }£-acre plats planted to each variety. 
The plats of B.H. 10(12) were rogued for mosaic, but roguing is 
generally practiced here and is therefore a general handicap for 
susceptible varieties. In calculating the significance of the data at 
Central Pagan each plat of P.O.J. 2878 was paired with the two 
nearest plats of B.H. 10(12). To secure the sucrose analyses the 
canes from plats of the same variety were ground together. The 
large mill units make the grinding of small lots impracticable. 
On all fields of the 1932 season a 12-8-4 fertilizer at the rate of 400 
pounds per acre was applied to the crop when it was l}i months old, 
and ammonium sulphate at the rate of 375 pounds per acre 2% months 
later. Applications made in 1931 were essentially the same. 
The gran-cultura trials at field no. 1, Hacienda Trinidad, of Central 
Pagan were conducted on a friable silt loam. There was ample 
water throughout the crop period (table 3). The field was flooded 
over when the cane was 10 months old. The crop was harvested in 
January 1931, when 17 months old. The results are shown in 
table 17. 
Table 17. — Results of gran-cultura sugarcane variety tests on unirrigated silt loam 
at Central Pagan, Hacienda Trinidad (field no. Gl) 1931 ' 
Variety and plat 
Acre yield 
of cane 
Normal juice 
analyses 
Available 
96° sugar 
Sucrose 
Purity 
per acre 
B.H. 10(12); plat 1 
Tons 
51.2 
43.6 
58.8 
48.8 
51.6 
50.4 
53.2 
43.6 
46. 6±2. 25 
53. 7±2. 05 
Percent 
Percent 
Tons 
P.O.J. 2878; plat 2 
B.H. 10(12); plat3_. 
P.O.J. 2878; plat 4 
B.H. 10(12); plat 5 .. 
P.O.J. 2878; plat 6 
B.H. 10(12); plat 7 . 
P.O.J. 2878; plat 8 
P.O.J. 2878 (average) 2 
15.0 
16.9 
82.4 
86.9 
3 6. 97 
B.H. 10(12) (average) 2 
3 8.25 
1 The data were supplied by E. H. Barrow, Russell & Co. 
1 Averages of 4 plats H acre in size, cut in January when 17 months old. 
3 To secure the sugar tonnage the 4 plats of each variety were ground together. 
The B.H. 10(12) plats exceeded adjoining plats of P.O.J. 2878 by a 
margin of 8 or 10 tons of cane per acre in three comparisons. The 
average cane production was 53.7 tons per acre for B.H. 10(12) and 
46.6 tons for P.O.J. 2878; the odds are 49 to 1 that this difference is 
significant. Owing to a definitely lower sucrose and purity for P.O.J. 
