16 



shows the necessity of providing both drainage and irrigation in order 

 to fortify against unfavorable climatic conditions. 



TEXTURE OF TOBACCO SOILS. 



Samples of soils and subsoils were taken from nearly every district 

 visited, and a portion of these were transmitted to the Bureau of Soils, 

 United States Department of Agriculture, for mechanical analyses. 

 The following table gives the results of the analyses, and indebtedness 

 to the Bureau of Soils is hereby acknowledged for its assistance in this 

 matter: 



Mechanical analyses of soils and subsoils from typical tobacco fields in severed of 

 the principal tobacco-growing districts of Porto Rico. 



[Fine earth.] 



( >rganic matter. 



Gravel, 2 to 1 mm. 



Coarse sand, 1 to 0.5 

 mm. 



s S 



ij 



§° 



IB 



- 



o 



1 



© 



Very fine sand, 0.1 to 

 0.05 mm. 



a 



i 



o 

 o 



43 



55 



Clay, o.O()5 to 0,0001 

 mm. 



P. ct. 

 5.97 



P.ct. 

 3.24 



P.ct. 

 6.02 



P.ct. 

 4.20 



P.ct. 

 12.64 



P.ct. 

 10.04 



P.ct. 

 31.72 



P.ct. 

 31.98 



3.75 



6.68 



7.28 



2. 72 



4.94 



7.20 



37.28 



33.70 



4.35 



10.86 



12.82 



5.68 



10.18 



7.96 



25.82 



26.68 



2 .sr 



6.06 



10.24 



4.50 



7.80 



9.88 



31.84 



29. 54 



1.33 



.52 



3. 16 



3. 62 



15. 14 



18.02 



33.36 



26.18 



.78 



.84 



4.30 



4.32 



15.22 



17.80 



32.38 



25. 14 



1.85 



1.72 



4. 70 



3.60 



11.18 



8.94 



38.50 



31.20 



2.53 



4.98 



9. 10 



5.20 



11.46 



8.36 



32.96 



27.66 



1.44 



5.30 



8.26 



5.22 



11.10 



11.32 



32.40 



25.80 



1.36 



5. 80 



6.54 



4.28 



10.12 



10.40 



33.54 



28.96 



1.29 



6.22 



14.98 



9. 50 



21.92 



17. 50 



15.36 



14. 34 



.82 



2.42 



5. 96 



3. 50 



8.02 



10. 76 



42.64 



26.70 



2.11 



3.68 



7. 16 





8.62 



8.46 



41.62 



25.98 



1.07 



1.80 



4.90 



4.24 



10.28 



9.80 



43. 24 



25.74 



1.25 



3.20 



6.36 



4. 06 



7.76 



8.96 



44.90 



24.68 



.59 



.04 



.50 



4.32 



53.32 



22.94 



11.72 



6.98 



3. 19 



3. 16 



5.30 



3.04 



7.46 



9.52 



45. 82 



25. 56 



2.08 



7. 28 



16.60 



8.48 



17.60 



11.14 



15. 10 



23.58 



No. 



9372 

 9373 

 9374 

 9375 

 9376 



9378 

 9379 



9380 

 9381 



9382 

 9383 

 9384 



9385 



Locality. 



Description. 



(1) 8 kilometers 

 NW. of Aibon- 

 ito. 



(2) 8 kilometers 

 NW. of Aibon- 

 ito. 



(3) 3-4 kilome- 

 ters SE. of 

 Cayey. 



(4) 3-4 kilome- 

 ters SE. of 

 Cayey. 



(5) 3-4 kilome- 

 ters SE. of 

 Cavey. 



(6) 3-4 kilome- 

 ters SE. of 

 Cayey. 



(7) 3 kilometers 

 SW. of Cidra. 



(8) 3 kilometers 

 NE. of Come- 

 rio. 



(9) 4 miles SE. of 

 Caguas. 



(10) 4 miles SE. 

 of Caguas. 



(11) Caguas 



(12) Caguas 



9388 



(13) 2-3 kilome- 

 t ers E . of 

 AguasBuenas. 



(14) 2-3 kilome- 

 ters E. of 

 Aguas Buenas. 



(15) 2-3 kilome- 

 ters E. of 

 Aguas Buenas. 



(16) 4-5 kilome- 

 ters E. of Are- 

 cibo. 



(17) Jayuya. 



(18) 1 kilometer 

 from Jayuya. 



Valley "La Plata." 

 soil* 0-10 inches. 



Valley "La Plata," 

 soil, 0-12 inches. 



Gravelly sandy 

 loam, 0-10 inches. 



Brown stonv loam, 

 10-20 inches. 



| Brown sandy soil, 

 0-12 inches/ 



Subsoil of 9376, 12-20 

 inches. 



Dark sandy loam. 



0-12 inches. 

 Dark sandy loam, 



0-12 inches 



Brown sandy loam, 



0-10 inches. 

 Subsoil of 9380,10-20 



inches. 

 Brown sandy loam. 



0-10 inches. 

 Subsoil of 9383, 10-20 



inches. 

 Dark loam, 0-10 



inches. 



Yellow loam. 10-20 

 inches. 



Yellow loam, 10-20 

 inches. 



Fine sand, 0-12 

 inches. 



Sandy loam, 0-10 



inches. 



Sandy loam, 0-10 



inches. 



