28 
BULLETIN 31, PORTO RICO EXPERIMENT STATION 
7 per cent in height, 8 per cent in number of leaves, 6 per cent in 
weight of leaves, and 7 per cent in weight of trunks and branches. 
The group receiving the lighter application of ammonium sulphate 
and that receiving an equivalent quantity of nitrogen in sodium 
nitrate, and the check were photographed July 27, 1923, by which 
time the differences due to fertilizer were plainly evident. (PL 3.) 
Figure 16 graphically shows the development of the young trees as 
FEGT/L/ZE/2 P££ CA7/V ^T £A!CH SEM//1NHUSU. /7PPL/CAT/ON 
i 
SODIUM 
A//TPATE 
^ Cr, 
SOD/UM 
A//TPATE 
IN 
1 
1 
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l i 
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1 
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Is 

G/3AMS 
6 \/0\/2\/6 
G/PAMS 
8 \/2 

G/SAMS 
G \/0 \/2\/6 
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a \/2 
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a \/0\/2\/6 
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8 \/2 
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GBAMS 
a \/0\/2 \/6 
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a \/2 
260 
240 
220 
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1 
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1 1 1 
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WE/GHT OF LEAVES 
i 
COUMT OF LEAVES 
WE/GHrOFM{/m/WD8£AHCm 
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FOOTNOTF- TO HALF OF THE CA/VS /N EACH SOD/UM N/TPATE GBOUP. 
SULPHUR ALSO WAS A PPL/ED. S££ TEXT. 
Fig. 16. — Development of young coffee trees as affected by the nitrogen carrier, 
expressed in percentages of the check at close of test, September, 1923 
Data 
affected by the nitrogen carrier, the data being expressed in percent- 
ages of the check. Table 13 shows the leaf growth and weight and 
woody development above ground resulting from the different forms 
of nitrogen. 
Table 13. — Development of young coffee trees as affected by ammonium sulphate 
as compared with sodium nitrate 1 
Fertilizer per can per application 
Sodium nitrate (8 grams) 
Ammonium sulphate (8 grams). 
Sodium nitrate (10 grams) 
Nothing (check) 
Sodium nitrate (10 grams) 
Ammonium sulphate (12 grams) 
Sodium nitrate (16 grams) 
Average 
Group 2 
per tree 
Inches 
1 
31 
2 
37 
3 
30 
4 
30 
5 
30 
6 
32 
7 
27 
i 
Average 
number 
of leaves 
85 
142 
70 
67 
76 
133 
77 
1 Data taken at close of the test, September, 1923. 
2 Each group contained 20 trees except Group 6, which had 17, 3 having died. 
Average 
weight 
of leaves 
Average 
weight 
of trunks 
and 
branches 
Grams 
57 
94 
44 
38 
52 
93 
50 
Grams 
68 
111 
58 
52 
63 
92 
54 
Some interesting comparisons are furnished. Both ammonium sul- 
phate groups surpassed the check in height, but this was true of only 
