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ห้องสมุดกรมพัฒนาที่ดิน

ศูนย์ศึกษาการพัฒนาห้วยทรายอันเนื่องมาจากพระราชด�าริ 59

3. ค�าบรรยายหน้าตัดดิน
Horizon Depth (cm) Description

(ชั้นดิน) (ความลึก) (ค�าบรรยาย)
A 0-20 Brown (7.5YR 4/2); loamy sand; weak fine and medium subangular

blocky structure; slightly hard, friable, non sticky and non plastic;
many very fine to medium roots; strongly acid (field pH 5.5); clear,

smooth boundary.

AC 20-30/40 Brown (7.5YR 4/2); loamy sand; weak fine and medium subangular
blocky structure; slightly hard, friable, non sticky and non plastic;

many very fine to medium roots; slightly acid (field pH 6.5); clear,
wavy boundary.

C1 30/40-55 Mixed light brown (7.5YR 6/3) and pink (5YR 7/3) loamy sand; single
grained; slightly hard, very friable, slightly sticky and non plastic;

common very fine and fine roots; moderately acid (field pH 6.0) clear,
smooth boundary.

C2 55-75 Mixed light brown (7.5YR 6/3) and pink (5YR 7/3) loamy sand;

few fine distinct strong brown (7.5YR 5/6) mottles; single grained;
soft, very friable, non sticky and non plastic; common fine and very

fine roots; moderately acid (field pH 6.0); clear, smooth boundary.

C3 75-100 Light brown (7.5YR 6/3); loamy sand; common medium and coarse

distinct reddish yellow (7.5YR 6/8) mottles; single grained; soft,
very friable, non sticky and non plastic; common fine and very fine
roots; moderately acid (field pH 6.0) clear, smooth boundary.

C4 100-130 Light brown (7.5YR 6/3) loamy sand; common fine and medium
distinct reddish yellow (7.5YR 6/8) mottles; single grained; very hard,

very firm, non sticky and non plastic; moderately acid (field pH 6.0)
clear, smooth boundary.

2Crd 130-190+ Mixed brown (7.5YR 4/2) pinkish gray (7.5YR 7/2) and reddish yellow

(7.5YR 6/8) slightly gravelly loamy sand; massive; extremely hard,
very firm, non sticky and non plastic; common iron and manganese

oxides concretions; moderately acid (field pH 6.0).