2 BULLETIN 35, PUERTO RICO EXPERIMENT STATION 
disadvantages of P.O.J. 2878 during harvesting operations, and 
retarded defecation. 
The data on general field plantings are submit led mainly to indi- 
cate the general adaptability of P.O.J. 2878. Under the data of 
each field of P.O. J. 2878 the data of adjoining fields of other varieties 
are given. Such figures, although barely indicative of the relative 
productions of varieties, are, nevertheless, helpful in explaining the 
wide variations in percentage of BUgar in cane between the north- 
coasl lowlands where P.O.J. 2878 was a failure, and the San German 
Valley where it was the outstanding variety. 1 
The variety trials at Oambalache, San Vicente, Central Aguirre, 
and Filial Amor were made by the Insular Department of Agriculture. 
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PlOTTBI L.— Typical portion of half-acre plats of gran-cultura sugarcane varieties P.O.J. 2878 on the left, 
and P.O.J. 2725 on the right, 5 months old. P.O.J. 2878 compares well with P.O.J. 2725 in stooling habit 
ami makes the more rapid growth throughout the crop period. P.O.J. 2878 averaged more than a foot 
taller than P.O.J. 2725. Photographed December 5, 1930, at Hormigueros, in the San German Valley 
district. 
The data on the first three variety trials are based on information 
published by the Insular Experiment Station. 2 
EXPERIMENTAL METHODS 
All sugar yields were calculated by means of the Winter-Carp- 
Geerligs formula, modified at each central according to milling and 
1 Acknowledgment is made to the Bureau of Chemistry and Soils, U.S. Department of Agriculture, 
and the Insular Experiment Station for permission to use soil-survey maps prior to their publication in 
identifying soil types t nless otherwise indicated, James Thorp and Ray C. Roberts of the Bureau of 
Chemistry and Soils identified the soil types of all fields herein reported. The names and descriptions of 
series are not given as they have not yet been confirmed. 
■ The Mayaguez station acknowledges with appreciation the active cooperation of the Insular Experiment 
Station which supplied the data of the Filial Amor experiment prior to their publication, and of Guillermo 
Cabrera, of Central Coloso: Rafael Bermudez, of Central Fajardo; E. H. Barrow, Owen Proverbs, and 
Waldemar Hill, of Russell <V- Co.; A. J. Sykes. of Rio Piedras, Emilio Rola, of Central Cambalache. 
dino Ramirez,, of Central Igualdad, Manuel del Valle, of Central Constancia; Aristides Gonzales, of 
Central Carmen; Nfaroelo J. Oben, of Central Aguirre; Jaime Annexy and Francisco Suria, of ' 
Eureka; Antonio Roig, of Eumacao; G. M. Gilt's and G. Cortada, Jr., of Central Mercedita, Ponce; and 
P. Menendez, of Central I'l izuela. 
