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ห้องสมุดกรมพัฒนาที่ดิน
62 ร า ย ง า น การส�ารวจดิน
AB 10/20-27/30 Dark reddish brown (5YR 3/3) moist and brown (7.5YR 5/3) dry; loamy
sand; moderate fine and medium subangular blocky structure;
slightly hard, very friable, slightly sticky and slightly plastic; many fine
and common medium roots; strongly acid (field pH 5.5) clear, wavy
boundary.
Bt1 27/30-50/55 Dark reddish (2.5YR 3/3) dry and reddish brown (5YR 4/6) moist; coarse
sandy loam; moderate fine and coarse subangular blocky structure;
slightly hard, very friable, slightly sticky and slightly plastic; very few
fine clay coatings on ped faces; common fine and few medium roots;
very strongly acid (field pH 5.0) gradual, wavy boundary.
Bt2 50/55-80 Dark red (2.5YR 3/6) dry and yellowish red (5YR 4/6) moist; coarse
sandy loam; moderate fine and coarse subangular blocky structure;
slightly hard, very friable, slightly sticky and slightly plastic; few clay
coatings on ped faces; common fine and few coarse roots; very
strongly acid (field pH 5.0) gradual, smooth boundary.
Bt3 80-125 Dark red (2.5YR 3/6) dry and yellowish red (5YR 4/6) moist, coarse
sandy loam; moderate fine and coarse subangular blocky structure;
slightly hard, very friable, slightly sticky and slightly plastic; few clay
coatings on ped faces; common medium and few coarse roots;
very strongly acid (field pH 5.0) gradual, smooth boundary.
Bt4 125-155 Red (2.5YR 4/6) dry and yellowish red (5YR 4/6) moist; coarse sandy
loam; strong fine and coarse subangular blocky structure; slightly hard,
firm, slightly sticky and slightly plastic; few clay coatings on ped
faces; common very fine and fine medium roots; very strongly acid
(field pH 5.0) gradual, smooth boundary.
Bt5 155-175 Dark reddish brown (2.5YR 3/4) dry and yellowish red (5YR 4/6) moist;
coarse sandy loam; strong fine and coarse subangular blocky structure;
slightly hard, firm, slightly sticky and slightly plastic; few clay coatings
on ped faces; common fine and medium roots; strongly acid
(field pH 5.5) gradual, smooth boundary.
Bt6 175-200+ Dark reddish brown (2.5YR 3/4) dry and yellowish red (5YR 4/6) moist,
coarse sandy clay loam; strong fine and coarse subangular blocky
structure; slightly hard, firm, slightly sticky and slightly plastic;
common clay coatings on ped faces; common very fine and fine
medium roots; moderately acid (field pH 6.0).
Remarks: Each horizons contain few granite fragments at the size of about 10-30 cm in diameter.

