326 



cox. 



Table XVII. — Mechanical atialyses of Philippine soils hy the modified Schone 



m ethod — Continued. 



o 



XI 



B 

 a 

 2i 



Specimen 

 of soil. 



§ 6 

 1 



i! 



a 





Fine earth, water free basis. 





Source. 



Remarks. 



T-l 



"2 a 



go 



a o 

 0-" 



ga 



11 



So 



§■= 

 So 

 CO 



is 

 M 



> 



o 

 o 

 o . 



§a 



5) 



m 



fflO 



•I5 



5 



64 



Surface- 



0.48 



1.10 



2.85 



10.01 



7.46 



15.32 



28.07 



35.19 



Near Alabang, 

 Rizal. 





65 



Subsoil _ 



0.66 



1.24 



2.85 



7.62 



7.28 



11.82 



31.57 



37.62 



do 1 





66 



Surface- 



1.54 



1.02 



2.44 



10.88 



9.71 



11.70 



28.78 



35.46 



do 



o 



67 



Subsoil _ 



2.26 



1.34 



2.62 



8.64 



9.52 



8.47 



28.08 



41.33 



do-. 



So 



68 



Surface- 



0.91 



1.96 



4.30 12.63 



10.41 11.32 



28.80 



30.59 



-—do j 



OT 



69 



Subsoil - 



0.55 



1.12 



2.49 ' 8..56 



10.34 1 8.41 



31..58 



37.50 



do 



2 



70 



Surface 



1.20 



1.75 



3.11 11.60 



10.35 13.04 



29.60 



30.55 



— do i 



a 



71 



Subsoil - 



0.97 



1.42 



2.64 9.87 



9.06 10.13 i 30.28 



36.60 



do 



3 



72 



Surface- 



0.82 



1.38 



3.05 10.18 



10.26 



8.62 1 31.32 



3.5.19 



— do : 



a. 



73 



Subsoil - 



0.52 



1.55 



2.97 9.05 



8.85 



7.27 31.10 



39.21 



--do - I 





= This soil is variable. In places it contains a high percentage of detritus some of 

 which is very large. 



» See Plate I, figs. 1 and 2. 

 <= See Plate I, fig. 3. 

 d See Plate II, fig. 1. 

 e See Plate II, fig. 2. 

 ' See Plate III, fig. 1. 

 * Cf. corresponding numbers. Table I. 

 The final weighings in these determinations were mostly made by Mr. A. S. Arguelles. 



APPENDIX. 



DIBECTIONS FOE TAKING SOU, SAMPLES.^ 



Make a general inspection of the region, and select a representative 

 field, i. e., one free from an}- modifications due to local conditions such 

 as erosion, washing, etc. Inside the tract to be sampled, select five or 

 six representative places, some distance from houses, fences, roads or 

 trees and in cultivated fields midway between two plants, remove the 

 surface accumulations of grass, leaves, or litter, and take samples with a 

 soil tube or auger. A. spade may be used if precautions are taken to dig 

 a hole, one wall of which is smooth and perpendicular, to the proper 

 depth and take the sample of soil from the side of the hole in a slice 

 about 8 or 10 centimeters thick. Avoid mixing the layers of different 

 depths. The sampling should be done preferably when the soil is reason- 

 ably dry, after the crop has been harvested and before fertilization. 



Surface soil. — Sample each of the five or sis spots chosen to a depth 

 of 15 centimeters (6 inches) or to the change between the surface soil 

 and subsoil, in case such change occurs between the depth of 15 and 30 



^ Conforming as far as practicable to methods in use in the United States and 

 elsewhere. Cf. Bull. U. S. Dep. Agr., Bur. of Chem. (1908) 107 (revised), 13. 



