
17 
It can be seen that all the above soils on which chlorotic plants 
were growing are calcareous or rendered so by the drainage water, 
while none of the good soils contain carbonate of lime. 
SOIL SURVEY X. 
Samples were also taken from fields where pineapples were grow- 
ing well on soils which had the same physical character as those pro- 
ducing the chlorotic plants. No chlorotic plants were observed in 
these fields or in the immediate vicinity. Nos. 175 and 176 are sam- 
ples from Campo Alegre, 177 from Manati, 179 and 180 from Rio 
Piedras. 
Analyses of pineapple soils (plants healthy). 









Soil constituents and reactions. No. 175. | No. 177. No. 179. No. 180. No. 176. 
Per cent. Per cent. Per cent. Per cent. Per cent. 
WHSOMIDIG INANE saece nacine sae ae- tees se 89. 78 95. 04 89. 99 96. 25 97. 12 
LEU ETCLE (CSAC) lie eR eet Boe Sear ee -04 - 09 - 06 - 04 .03 
NEUIE ICO AIO e- imtcats slow aoc ratte estates te -14 oy Trace. Trace. 15: 
Macnpcigh (MeO) )-t0i. jotsec cutback ae san- Trace. Trace. Trace. Trace. Trace.. 
Ferric and aluminie oxids (Fe203 and 
PAT Oa) ace Sse oe ie Pee ce Pe 5. 93 1. 76 5. 08 .70 1. 88 
Phosphorus pentoxid (P205).......-..-.--- -04 - 03 04 .04 - 03 
IMolatilemattel secs. cece csaasiege ctor aaeins 3. 93 2. 86 4, 50 2. 92 1. 30° 
MOG era sowanes sm nacesnecisa acl 99. 86 99. 95 99. 67 99.95 100. 51 
Se NLEO PERN) nacnwemniaws eee er esa aese er - 09 - 05 old 09 . 09 
IMDISUUTGte esc cee sere cb es eras tees sees coos 3.34 Sto 1 a . 59 - 50 
Carbon dioxid) (COs). 42.28. bonnes ot -00 - 00 - 00 . 00 . 00 
Ca cium carbonate (CaCO3) .......-...-.-- 00 - 00 - 00 . 00 . 00 
POAeUION tO WTOUS <5. ocidc se eosectie ooaae | Acid. Acid. Acid. Acid. Acid. 


It will be seen that these good soils are also without calcium 
carbonate. 
The results of the soil surveys are as follows: 
Of the 43 samples of soil analyzed, 22 were taken from areas where 
the pineapples were chlorotic and 21 from areas where they were 
healthy. 
The good soils contain, on an average, 0.11 per cent potash (K,0),. 
0.07 per cent phosphoric acid (P,O,), and 0.14 per cent nitrogen (N). 
The bad soils average 0.12 per cent potash (K,O), 0.10 per cent phos- 
phoric acid (P,O,), and 0.17 per cent nitrogen (N). Thus the soils 
producing chlorotic plants average higher in nutrients than the soils 
producing healthy plants. 
The chief difference between the soils producing chlorotic and 
healthy plants lies in the content of calcium carbonate (CaCO,). 
The bad 30ils contain from 1.86 to 79.76 per cent of calcium carbo- 
nate (CaCO,).! All the good soils contain less than 1.15 per cent 
CaCO, and most of them no lime in the form of carbonate. 
! Nos. 204 and 205 are excepted as here the plants were exposed to the action of a greater amount, of lime: 
than appears in the soil analyses. 
412°—Bull. 11—11——-3 
