Page 174 - การศึกษาลักษณะและสมบัติของดินที่มีวัตถุต้นกำเนิดจากหินแกรนิตบริเวณจังหวัดอุทัยธานี

ห้องสมุดกรมพัฒนาที่ดิน
136

AB 18-30/35 Very dark grayish brown (10YR 3/2); slightly gravelly
sandy loam; moderate fine subangular blocky structure;
slightly hard, friable, non sticky and non plastic;
common very fine interstitial and few coarse tubular
pores; many very fine to medium roots; moderately acid
(field pH 6.0); clear, wavy boundary to Bt1.

Bt1 30/35-60 Brown (10YR 4/3); gravelly sandy loam; moderate
medium subangular blocky structure; slightly hard,
friable, non sticky and non plastic; patchy thin argillan
on ped face and in pore; common very fine interstitial
and few coarse tubular pores; many very fine to
medium roots; moderately acid (field pH 6.0); clear,
smooth boundary to Bt2.

Bt2 60-85/90 Dark yellowish brown (10YR 4/4); gravelly sandy loam;
moderate medium subangular blocky structure; slightly
hard, friable, non sticky and non plastic; patchy thin
argillan on ped face and in pore; common very fine
interstitial and few coarse tubular pores; many very fine
to roots; moderately acid (field pH 6.0); clear, wavy
boundary to BCr.

BCr 85/90- Dark yellowish brown (10YR 4/4); extremely gravelly
130/140 coarse sandy clay loam; moderate medium subangular
blocky structure; hard, firm, slightly sticky and slightly
plastic; common angular rock fragment from porphyry
granite diameter 2-10 cm; moderately acid (field pH 6.0);
clear, wavy boundary to Cr.

Cr 130/140- Strong brown (7.5YR 4/6); many coarse angular rock
175+ fragment and weathering rock from porphyry granite;
slightly acid (field pH 6.0).