34 
BULLETIN 35, PUERTO RICO EXPERIMENT STATION 
P.O.J. 2878 yielded a ton more sugar per acre than did P.O.J. 2725 in 
the variety trial at Filial Amor, and also wa> superior to F.C. 916. 
P.R. 803, and P.O.J. 2714. The general field results for both 1931 and 
1932 crops in the San German Valley indicated that P.O., I. 2878 will 
either equal or exceed P.O.J. 2725 in cane production and in sugar 
production and, on account of its erect growth habit, will develop fees 
rot. The percentage of sugar in cane of P.O.J. - s 7s was in general 
either equal or superior to that of P.O.. I. 2725 or B.H. 10(12). 
Mosaic and a droughty period of 3 to 4 month- restrict the exten- 
sion of B.H. 10(12) in the San German Valley, but they do not affect 
that of P.O.J. 2878. Yields of ratoons of susceptible varieties show 
marked reduction and cost of roguing Lb Iiiirh; consequently, B.H. 
10(12) is rapidly being replaced by the mosaic-resistant P.O.J. 2878. 
PRIMAVERA AND FIRST-RATOON TRIALS AT CENTRAL AOIIRRE 
The centrals along the south coast have been conservative about 
adopting P.O.J. 2878 or testing it extensively. B.H. 10(12) has 
given satisfactory results because of good cultural conditions and the 
fact that most of the land is under irrigation. Furthermore, unlike 
the situation along the north coast or in the western end of the island, 
mosaic has never been a serious problem and in fields of B.H. 10(12) 
has easily been controlled by systematic roguing. Except for general 
field plantings, data on only one variety trial with P.O.J. 2878 are 
available for the entire south coast. 
P.O.J. 2878 has not invariably given a low sucrose content on friable 
rich alluvial soils. In the primavera variety trial carried on at 
Hacienda Josef a by Central Aguirre in cooperation with the Insular 
Experiment Station on soil of this type, a perfectly drained loam, with 
a very porous subsoil, P.O.J. 2878 gave a very satisfactory sucrose 
content. A 12-8-4 fertilizer, at the rate of 400 pounds per acre, was 
applied to the crop and was followed later with ammonium sulphate 
at the same rate. The results are shown in table 24. 
Table 24. — Results of sugarcane variety tests on irrigated perfectly drained loam at 
Central Aguirre, Colonia Melania, Hacienda Josef a, 1930 x -31 
Variety and culture 
13>$-month primavera cut in March 1930, 
irrigated 143.76 inches: 
P.O.J. 2878 J (averages of 9 plats)* 
B.H. 10(12) (averages of 7 plats) 
S.C. 12/4 (averages of 6 plats) 
12H-month first ratoons cut in April 1931, 
irrigated 81.95 inches: 
P.OJ. 2878 * (averages of 9 plats) 
B.H. 10(12) (averages of 7 plats).. 
12/4 (averages of 6 plats) 
Germi- 
nation 
Percent 
82 
78 
Acre yield 
of cane 
Tons 
73. 77±1.31 
65.57±1.31 
61. 16±1.69 
43.38± .81 
37.83± .91 
37.40±1.38 
Acre yield 
of sugar 
Tons 
8. 56±0. 14 
7.91± .08 
6.61± .28 
5.40± .60 
4. 93± . 14 
4.52± .07 
Sugar 
in cane 
Percent 
11.60 
12.06 
10.80 
12.44 
13.01 
12.08 
Rainfall 
Total 
Inches 
■ 49.88 
28.61 
Two 
months 
before 
harvest 
Inches 
2.55 
1.51 
1 Richardson Kintz, P. la prodvoion he ntevas vakiepapks Dl cana y sis resi/ltapos experi- 
mental^, p.r. Dept. Agr. and Com. Insular Expt. Sta. Bui. 38:21. 1981. 
1 Considerable arrowing and uprooted stools were observed in the primavera growth of P.O.J. 2878. 
1 Plats k-o acre la size. 
4 No arrowing occurred in the ratoon plats of P.O.J. 2878. 
