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ห้องสมุดกรมพัฒนาที่ดิน

68 ร า ย ง า น การส�ารวจดิน

3. ค�าบรรยายหน้าตัดดิน

Horizon Depth (cm) Description
(ชั้นดิน) (ความลึก) (ค�าบรรยาย)

A 0-22 Brown (7.5YR 4/2) loamy sand; weak fine and medium subangular
blocky structure; soft, very friable, non sticky and non plastic;

many very fine and common medium roots; strongly acid (field
pH 5.5) clear, smooth boundary.

C1 22-50/55 Brown (7.5YR 5/3) loamy coarse sand; weak fine and medium
subangular blocky structure; soft, very friable, non sticky and non

plastic; common very fine and few medium roots; lamellae
10 cm-thick; moderately acid (field pH 6.0) clear, wavy boundary.

C2 50/55-70 Pinkish gray (7.5YR 6/2) loamy coarse sand; single grain; soft, very

friable, non sticky and non plastic; few fine and few medium roots;
moderately acid (field pH 6.0) clear, smooth boundary.

C3 70-90/100 Pinkish gray (7.5YR 7/2) loamy coarse sand; single grain; soft, very

friable, non sticky and non plastic; few fine and few medium roots;

moderately acid (field pH 6.0) clear, wavy boundary.

2Cr1 90/100-130 Pinkish gray (7.5YR 7/2) saprolite; very gravelly loamy sand; massive;
soft, very friable, non sticky and non plastic; few fine and medium

roots; gravels composing of granite fragments; moderately acid
(field pH 6.0) abrupt, smooth boundary.

2Cr2 130-160 Light brown (7.5YR 6/4) saprolite; extremely gravelly loamy sand;

massive; soft, very friable, non sticky and non plastic; few
medium roots; gravels composing of granite fragments; slightly acid

(field pH 6.5) clear, wavy boundary.

2Cr3 160-200+ Light brown (7.5YR 6/4) saprolite; extremely gravelly loamy sand;

massive; soft, very friable, non sticky and non plastic; few medium
roots; gravels composing of granite fragments; slightly acid (field

pH 6.5).