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ห้องสมุดกรมพัฒนาที่ดิน

ศูนย์ศึกษาการพัฒนาห้วยทรายอันเนื่องมาจากพระราชด�าริ 65

3. ค�าบรรยายหน้าตัดดิน

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

A 0-15 Brown (7.5YR 4/2) loamy coarse sand; weak fine and medium
subangular block structure; soft, very friable, non sticky and non

plastic; few coarse and common very fine and fine roots; strongly
acid (field pH 5.5) gradual, smooth boundary.

AC 15-35 Brown (7.5YR 5/2) loamy coarse sand; weak fine and medium
subangular block structure; soft, very friable, non sticky and non

plastic; few coarse and common very fine and fine roots; strongly
acid (field pH 5.5) clear, smooth boundary.

C1 35-60 Brown (7.5YR 5/3) slightly gravelly loamy coarse sand; single grain;

soft, friable, non sticky and non plastic; few very fine and fine,
few coarse roots; fragments of tiny feldspar and quartz; strongly acid

(field pH 5.5) gradual, smooth boundary.

C2 60-85 Mixed brown (7.5YR 5/4) and yellowish red (5YR 5/6) slightly

gravelly coarse sand; single grain; soft, friable, non sticky and non
plastic; few fine roots; fragments of tiny feldspar and quartz;
very strongly acid (field pH 5.0) clear, smooth boundary.

C3 85-100/110 Mixed light brown (7.5YR 6/3) and yellowish red (5YR 5/6) loamy
coarse sand; single grain; loose, very friable, non sticky and non

plastic; few fine roots; very strongly acid (field pH 5.0) clear, wavy
boundary.

2Crd 100/110-130 Mixed brown (7.5YR 4/2) brown (7.5YR 4/4) and light brown (7.5YR 6/4)

sandy loam; massive; very hard, very friable, slightly sticky and
moderately plastic; strongly acid (field pH 5.5).