30 
BULLETIN 35, PUERTO RIl EXPERIMENT STATION 
Table 22. lu. suits of qran-cuUiira sugarcane variety teste conducted on irrigated 
silt;/ day by //>< Insular Department of Agricultun in cooperation with /•' 
dt Co. at the San Francisco farm at Filial Amor, IS 
Vart 
Qarmina- 
tlOIl 
yield i 
yield ■' 
Sugar in 
P o J 2878 
98.0 
M.0 
Ton* 
1,7 ia i 
Tuns 
1 0. 328 
.259 
.250 
. 150 
7.791± .238 
. 105 
. r >. iHUi . 177 
. 
!' 1. MH 
11 74 
P R 309 
11 49 
i'.o.J. 2728 ' 
10 *1 
.'711 
. 
ii \» 
11 Si 

r i: 807 
10 39 
1 These data supplied i>> P. Richardson Cunts, of the Insular Experiment station, Rio Piedras, in ad- 
• their publication. 
- irrigation water was applied bal not measured on Jan. 22, Feb. 21. and Mar. 15,1811. The rainfall was 
:; 78 inches during the 2 months preceding harvest. The cane was harvested in January when 17 1 < months 
old. 
\ \ . r tges of six I .u-acre plats excepting data of P.O.J. 2725 which are averages of 14 plats. 
1 I'.o.J. 2728 was grown Bfl a check variety In every fourth plat. 
The germination was excellent for all varieties and no replanting: was 
necessary. All varieties grew well from the start. Rainfall was 
ample throughout the crop period, except from January to March 
1931, when it was supplemented by irrigation water; growth was 
therefore uninterrupted. Conditions were also normal for ripening 
as only 1.15 inches of rain fell during the month of harvest and only 
2.65 inches during the preceding month. 
Conditions were much more favorable for high tonnage production 
at Filial Amor than at Coloso. The total rainfall at Filial Amor 
(table 3) was 140.36 inches, or about 30 inches greater, and the cane 
was more closely spaced in the row, one cutting being planted every 
30 centimeters instead of three cuttings every meter apart. P.R. 801 
and P.O.J. 2714, which were failures at Coloso, produced at Filial 
Amor, respectively, 74.4 and 69.2 tons of cane per acre. P.O.J. 2878 
ranked first in cane production, with an average yield of 79.33 tons 
per acre, or nearly 30 tons more than at Coloso. 
The comparison between P.O.J. 2878 and P.O.J. 2725 is of particular 
interest as, prior to the introduction of P.O.J. 2878, the latter was the 
standard variety in the San German Valley. As at Coloso, differences 
in cane production between these two canes was slight, a margin of 
3 tons per acre in favor of P.O.J. 2878. The outstanding result of 
this trial was, however, the superior juice quality of P.O.J. 2^7 8, 
which gave it a lead over P.O.J. 2725, P.O.J. 2714, ~F.C. 916, and the 
four Puerto Rico seedlings. It exceeded all other varieties by over a 
ton of sugar per acre. On the rather compact silty clay loam soils of 
the San German Valley similar to that on which the experiment was 
conducted, P.O.J. 2878 will probably outvield P.O.J. 2725, P.O.J. 
2714, F.C. 916, P.R. 801, P.R. 803, P.R. 807, and P.R. 809 in irrigated 
gran-cultura plantings. 
GENERAL FIELD PLANTINGS IN THE SAN GERMAN VALLEY 
The 1931 crop of P.O.J. 2878 in the San German Valley was. 
contrary to results along the north coast, satisfactory in sugar yield 
and in cane production. Central Eureka, on cane lands largely of a 
clav type, secured very satisfactory sugar 3-ields from 177 acres of 
P.O.J. 2878 primavera^(table 14). 
Data from the lands of Russell & Co. are available on cane produc- 
tion only. In 2 fields P.O.J. 2878 was markedly the superior and 
