SUGARCANE VARIETY P.O.J. 2878 IN PUERTO RICO 6 
factory efficiency, and Spencer's 8 table for available sugars was 
used. At Central Fajardo the following formula was used: 
Yield = [normal sucrose — (normal Brix X 0.32)) X 1.14. 
The Aguirre formula was as follows: 
Yield = [normal sucrose — (normal Brix — normal sucrose) X 0.4] X 0.8. 
The generalized probable errors for the Coloso experiment were 
calculated through use of the following formula, discussed by Richey: 4 
<T 2 e_ m((T 2 T-a 2 R-<T 2 G) 
n (m — 1 ) (n — 1 ) 
The significance of the data in the other experiments was deter- 
mined by Love's method. 6 
SEASONAL CONDITIONS 
Results from P.O.J. 2878 in 1931-32 were in decided contrast where 
soil and climatic conditions differed, the percentages of sugar in cane 
being very poor along the north coast and very good in the San 
German Valley. This may be explained partly by differences in 
the rainfall distribution, particularly during the critical ripening 
period of December, January, and February, as shown in table 1. 
Table 1, 
■Rainfall at different places during critical periods of sugarcane ripening 
in Puerto Rico, 1929-32, and normal for 1899-1928 
1929 
1930 
1931 
1932 
Normal, 
1899-1928 
Dec. 
Jan. 
Feb. 
Dec. 
Jan. 
Feb. 
Dec. 
Jan. 
Feb. 
Dec. 
Jan. 
Feb. 
Fajardo 
Manati . . . .. 
Inch 
1.80 
3.08 
5.50 
6.97 
4.52 
3.56 
1.12 
2.70 
2.92 
1.24 
2.49 
1.80 
.97 
1.49 
Inch 
8.74 
4.57 
7.07 
10.07 
3.82 
7.11 
2.49 
4.35 
4.00 
2.29 
2.84 
3.78 
5.13 
6.79 
Inch 
1.45 
1.28 
3.46 
3.36 
.41 
.70 
.84 
.55 
1.39 
2.30 
Tl5~ 
2.94 
1.30 
Inch 
4.82 
5.86 
5.75 
5.22 
~8.~ 57" 
4.11 
2.25 
3.25 
6.30 
3.89 
2.75 
.20 
.34 
Inch 
1.75 
.85 
1.30 
1.77 
4.10 
1.75 
1.47 
.40 
.80 
1.59 
.16 
1.65 
1.63 
.56 
Inch 
6.63 
7.41 
5.76 
9.58 
.84 
~6.~56~ 
3.95 
3.89 
2.35 
3.54 
2.52 
2.75 
2.38 
Inch 
2.48 
Inch 
4.43 
Inch 
0.60 
Inch 
4.86 
6.75 
Inch 
3.50 
5.14 
Inch 
4.01 
4.22 
Toa Baja 
2.48 
7.58 
3.59 
5.61 
2.24 
1.55 
.87 
3.40 
1.40 
3.03 
.16 
2.23 
17.04 
.87 
Toa Alta 
Arecibo 
Barceloneta 
Isabela.. 
Coloso 
Mayaguez 
San German 
Anasco. . 
5.46 
7.61 
6.70 
2.88 
1.79 
1.07 
1.27 
.50 
.30 
.29 
.15 
.16 
1.24 
1.50 
'6.07 
5.36 
4.62 
2.60 
2.62 
3.19 
2.84 
2.80 
1.22 
1.86 
2.45 
5.44 
5.77 
3.43 
2.13 
1.89 
1.96 
1.52 
2.15 
1.01 
1.38 
2.25 
4.07 
4.64 
2.69 
2.09 
2.20 
2.65 
2 90 
CaboRojo.. . ... 
2.98 
Ponce . 
.99 
Aguirre 
.62 
1 57 
Jayuya ... ... 
2 20 
1 Record for Dorado near Toa Baja. 
Table 1 shows that, with the exception of Arecibo and Barceloneta, 
along the entire north coast and in the eastern end of the island, 
including the area extending from Isabela to Fajardo, the rainfall 
was sufficient for continued growth and abnormally high for ripening 
during December 1930 and February 1931. These conditions, 
3 Spencer, G. L. a handbook for cane-sugar manufacturers and their chemists. Ed. 5, partly 
rewritten and enlarged, p. 483. New York and London. 1916. 
4 Richey, F. D. the moving average as a basis for measuring correlated variation in agro- 
nomic experiments. Jour. Agr. Research 32: 1161-1175. 1926. 
* Love. H. H. a modification of student's table for use in interpreting experimental results. 
Jour. Amer. Soc. Agron. 16: 68-73. 1924. 
