12 
BULLETIN 31, PORTO RICO EXPERIMENT STATION 
the first two applications, and a 5-gallon measureful was applied 
thereafter as a surface mulch subsequent to fertilization. 
Measurements of height, taken annually from 1912 to 1916, in- 
clusive, the period of rapid stem elongation, showed that, of the 
PO/NTS DET£PM/M£D Br TP££S //V 
D/VS./-2 2-3 3-4 4-S 
£A/£ OF ££PT/l/Z££ P££ T£££ P££ /tPPUCAT/OM 
§ ^4-/2 POUND '/a-/ POUND /-2 POUNDS 2-4 POUNDS 
\z4000 
% 22000 
V)20000 
S 
\/8000 
^/OOOO 
.moo 
K/2000 
^/oooo 
%aooo 
K OOOO 
& 4000 
^2000 
Fig. 7. — Total average production for the 8-year period, 1917-1924, of those trees which 
received any one element in contrast with those to which that particular element was 
not applied, the latter or check being represented by a similar symbol underscored 
Erect a plats, each of the 3 plats receiving nitrogen averaged higher 
than either of the other 2, with the NP plat leading. Table 6 shows 
the average annual production per tree in liters of cherries. . 
Table 6. — Average annual production of coffee cherries per tree, Padang and 
Erecta plats with different fertilizer treatments 
K£YTO CfAPH SHOIV/NS r£BTIU2£BS APPU£D 
SYMBOLS ACE COffBIHED TO /ND/CATE 
rseT/uzEe comb/nat/ons 
CrttCn- - rjjj^wvw 
MTBOGENV^r™ ' 
UME—---- 
PHOSPHO/e/C /1C/D 
POTASH 
SULPHt/e--- 
□□□□□□□a 
- + + + + + + + + + + 
oooooooooo 
Yields with the different treatments 
Year 
Padang 
Erecta 
Check 
NPK 
and 
manure 
NK 
NP 
Check 
PK 
NPK 
1912 
Liters 
1.4 
2.8 
2.5 
3.5 
2.1 
5.1 
1.2 
4.7 
.8 
.5 
5.0 
1.8 
2.9 
Liters 
2.0 
3.8 
3.4 
3.6. 
3.6 
3.6 
1.9 
4.0 
1.0 
1.1 
6.1 
3.7 
4.1 
Liters 
0.4 
.8 
1.0 
1.4 
1.0 
5.7 
1.2 
3.2 
.7 
1.9 
2.6 
2.0 
1.6 
Liters 
0.9 
1.5 
1.2 
2.0 
1.1 
5.7 
.8 
2.9 
1.2 
2.3 
3.0 
1.6 
1.2 
Liters 
0.1 
.3 
.2 
.5 
.3 
2.8 
.3 
1.9 
.7 
1.2 
2.9 
1.6 
1.9 
Liters 
0.2 
.2 
.2 
.6 
.6 
2.8 
.5 
2.5 
.8 
2.0 
3.4 
3.2 
2.5 
Liters 
0.5 
1913 
1.2 
1914.. 
.8 
1915... 
2.0 
1916 -. 
1.6 
1917 
8.4 
1918.. 
1.6 
1919 . 
5.8 
1920. 
1.9 
1921 
5.0 
1922.. 
5.2 
1923.. 
6.1 
1924 
3.5 
Total 
34.3 
41.9 
23.5 
25.4 
14.7 
19.5 
43.6 
