FERTILIZERS FOR COFFEE IN PORTO RICO 
11 
provided for the trees to form platforms into which the fertilizer 
could be worked. 
The 5 Erecta plats included a check, 1 plat which received com- 
plete fertilizer, and 3 each of which lacked one element in the fer- 
PU7TNOS. 
/ '/* /O 
1 
I 
\ 
Qi ^ Co 
< ■?» 5 
ki 
I 8! 
5 
8 
Ik 
S 
5*4 SO 
5! 
40 
/C P N NK 1 PK NP NP/< O 
A//T P/C A/P \/VP/f O /T P A/ 
A/PK O /f P N NX P/f /VP 
P N /W /C NP A/PK O PK 
PK NP A/PK \ O K PA/ Lv/r 
Fig. 6. — Total average yield per tree for the 8-year period 1917-1924. each line repre- 
senting the production of 1 kilogram of coffee cherries. Plats arranged in relative 
position in South Field 
tilizer combination. The Padang plats included a check, and 1 
which received the same kind of fertilizer as that applied to the 
Erecta plat receiving complete fertilizer plus a liberal quantity of 
stable manure. Fifteen pounds of manure per tree were given in 
