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ห้องสมุดกรมพัฒนาที่ดิน

64 ร า ย ง า น การส�ารวจดิน

3. ค�าอธิบายหน้าตัดดิน

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

Ap1 0-22 Brown (7.5YR 4/2) sandy loam; moderate medium to coarse
subangular blocky structure; friable, slightly sticky and very plastic;

many very fine to fine interstitial and tubular pores; many medium
and few very fine to fine roots; strongly acid (field pH 5.5); abrupt,

smooth boundary to Bt1.

Bt1 22-50 Dark yellowish brown (10YR 4/4) sandy clay loam few fine distinct;

moderate medium to coarse subangular blocky structure; firm,
slightly sticky and very plastic; few patchy coating along root and

quartz grain; many fine to medium interstitial and tubular pores;
few medium and few fine roots; strongly acid (field pH 5.5); clear,

smooth boundary to Bt2.

Bt2 50-70 Strong brown (7.5YR 5/6) sandy clay; moderate medium to coarse

subangular blocky structure; firm, slightly sticky and very plastic;
few patchy coating along root and quartz grain; many very fine to

fine tubular pores; few medium and few fine roots; strongly acid
(field pH 5.5); gradual, smooth boundary to Bt3.

Bt3 70-100 Strong brown (7.5YR 5/6) sandy clay loam; moderate medium to
coarse subangular blocky structure; firm, slightly sticky and very

plastic; few patchy coating along root and quartz grain; many very
fine to fine tubular and few medium interstitial pores; few fine and

few coarse roots; moderately acid (field pH 6.0); gradual, smooth
boundary to Bt4.

Bt4 100-130 Yellowish brown (10YR 5/6), srong brown (7.5YR 5/6), yellowish red

(5YR 5/8) and light gray (10YR 7/2) sandy clay; moderate medium

to coarse subangular blocky structure; firm, slightly sticky and very
plastic; few patchy coating along root and quartz grain; many very
fine to fine tubular and few medium interstitial pores; few fine and

few medium roots; moderately acid (field pH 6.0); gradual, smooth

boundary to Bt5.