12 
soil. Sample 198 was taken from a patch of exceptionally vigorous 
plants 10 yards away. About 100 yards distant was another patch 
of 50 colorless plants. The soil, of which No. 199 is a sample, con- 
tained many coral particles but was over 2 feet deep. No. 200 was 
taken from the midst of vigorous plants 15 yards distant from No. 
199. The soil here contained no coral particles. Twenty-five per 
cent of sample 197, 4 per cent of 198, and 40 per cent of 199 did not 
pass through a 1 millimeter sieve. This residue that is not included 
in the analyses was made up of coral particles, i. e., calcium car- 
bonate. Hence the soil in these three cases must be regarded as con- 
taining more calcium carbonate than appears in the analyses. 
Analyses of pineapple soils. 

d No. 197 No. 198 No. 199 No. 200 
Soil constituents and reaction. (plants (plants (plants (plants 
chlorotic). | healthy). | chlorotic). | healthy). 
Percent. | Percent. | Percent. | Percent. 
81. 


Insoluble matter. ...........-/ Fe ais apes ee tw rasa emia ymieal 73.91 83.08 79. 43 74 
Potash! (KsO)s 2 ~ 2 os cece oemasse bates he ace seeaeere -20 24 24 24 
Tame! (CaO). eeeccks sca tcee weve eae ce eema-ceesecscahiean 5.17, 1.44 3.41 1.50 
Maonesia (Me@)icc< 5 waasstenesaces eee cece ceesee ee Trace. 42 38 225 
Ferric and aluminic oxids (Fe2O3 and AleO3)........--- 9.24 6.03 6. 66 9.61 
Phosphorus pentoxid (POs) s.- <4 -eelanewie lens eames 1.13 09 08 -08 
Wolatile mia petcs <n imeem e eminieeiosie ees wlcla mtn slnietn bila yn 11.65 8.71 8.93 6. 50 
Total els cc8) oie aces te cecte tee seen oeincesp sane 100. 30 100. 01 99. 13 99. 92 
INI ngefevn oN Bk Sonadignene Soda nde sebacioc aoeoaues a5 3 sce - 40 29 ~22 -18 
Moisture 3.20 Pccicns cwcigste seeds eccebabincms =< sscpeneeed 3. 32 4.10 3. 34 3. 30 
Warbon! dioxid (COs). oe vase ek oj oe aiaeiae ms niall een ae 2. 03 - 00 2. 22 Trace. 
Calcium carbonate (CaCQOs)-<-..-.-..25-:-....0-2-5--- 4. 62 - 00 5. 05 Trace. 
Reaction tojiumussce.. 2 -saceesse. =. eemeeeeeieseencn= Alkaline. | Alkaline. | Alkaline. Alkaline. 
Here again the difference between the good and bad soils, lying in 
such close proximity to each other, is in the content of calcium 
carbonate. 
SOIL SURVEY VI. 
Plantation of Arturo S. Jimenez (Plantage del Rio) about 3 miles 
west'of Bayamon: Of about 2 acres of red Spanish pineapples planted 
here 90 per cent had lost their color within 12 months. Six months 
later the remaining 10 per cent became colorless and the plants were 
removed. The planting was located a mie or more distant from the 
sea on a loose, sandy soil that contained many shell particles, 
Bananas and native corn were growing fairly well here. Previous 
to planting with pineapples a good crop of tobacco had been taken 
from this field. Samples 183 and 185 were taken from two different 
parts of the field by the writer; No. 156, from the same field, was 
taken by a neighboring planter. No. 157 is a sample from a nearby 
healthy planting and was taken by the owner. 
[Bull. 11] 
