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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.
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