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ห้องสมุดกรมพัฒนาที่ดิน

56 ร า ย ง า น การส�ารวจดิน

3. ค�าอธิบายหน้าตัดดิน

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

Apg1 0-20 Brown (7.5YR 5/2) sandy loam; moderate medium and coarse
subangular blocky structure; friable, slightly sticky and slightly plastic;

many very fine interstitial and common fine simple tubular pores;
many fine and medium roots; slightly acid (field pH 6.5); clear, smooth

boundary to Apg2.

Apg2 20-40/50 Gray (7.5YR 6/1) sandy clay loam; common medium distinct strong

brown (7.5YR 5/8) and common medium distinct yellowish red (5YR
5/8) mottles; moderate coarse subangular blocky structure; very

friable, slightly sticky and plastic; discontinuous moderate on pore
void and ped face; many very fine interstitial and common fine

simple tubular pores; common very fine to fine and few moderate
roots; moderate acid (field pH 6.0); abrupt, wavy boundary to Btg1.

Btg1 40/50-70 Pinkish gray (7.5YR 7/2) sandy clay loam; many medium distinct
reddish yellow (7.5YR 6/8) mottles; moderate medium and coarse

subangular blocky structure; friable, slightly sticky and slightly
plastic; broken thin on pore void and and ped face; many very fine

and common fine interstitial and common fine simple tubular pores;
few very fine to fine roots; moderate acid (field pH 6.0); clear, smooth

boundary to Btg2.

Btg2 70-120 Light gray (7.5YR 7/1) sandy clay loam; many medium distinct reddish

yellow (7.5YR 7/8) mottles; moderate few and medium subangular
blocky structure; friable, slightly sticky and slightly plastic; broken thin

on pore void and and ped face; many very fine and common fine
interstitial and common fine simple tubular pores; few very fine to

fine roots; strongly acid (field pH 5.5); clear, smooth boundary to Btg3.