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ห้องสมุดกรมพัฒนาที่ดิน

68 ร า ย ง า น การส�ารวจดิน

3. ค�าอธิบายหน้าตัดดิน

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

Ap1 0-12 Brown (7.5YR 5/4) loamy sand; weak fine to medium subangular
blocky structure; soft, very friable, non sticky and non plastic; many

very fine to fine interstitial and tubular pores; many very fine to
fine roots; neutral (field pH 7.0); abrupt, smooth boundary to Ap2.

Ap2 12-30/35 Light brown (7.5YR 6/4) loamy sand; weak fine to medium subangular
blocky structure; soft, very friable, non sticky and non plastic; patchy

thin clay coat ped face; many very fine to fine interstitial and simple
tubular pores; common fine to medium roots; neutral (field pH 7.0);

clear, wavy boundary to Bt1.

Bt1 30/35-55 Pink (7.5YR 7/4) loamy sand; moderate fine subangular blocky

structure; soft, very friable, non sticky and non plastic; patchy thin
clay coat ped face; many fine interstitial and simple tubular pores;

common fine and few coarse roots; neutral (field pH 7.0); clear,
smooth boundary to Bt2.

Bt2 55-90 Pink (7.5YR 7/3) loamy sand; weak fine to medium subangular blocky
structure; soft, very friable, non sticky and non plastic; patchy thin

clay coat ped face; many fine interstitial and simple tubular pores;
few fine to medium roots; neutral (field pH 7.0); gradual, smooth

boundary to Bt3.

Bt3 90-115 Pink (7.5YR 7/3) loamy sand; weak fine subangular blocky structure;

soft, very friable, non sticky and non plastic; patchy thin clay coat
ped face; many fine interstitial and simple tubular pores; few

fine to medium roots; slightly acid (field pH 6.5); gradual, smooth
boundary to Bt4.