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ห้องสมุดกรมพัฒนาที่ดิน
139

คําอธิบายหนาตัดดิน พีดอน 4 ชุดดินอุทัย (Uthai series)
I Information on the site

Profile symbol : Pedon 4
Soil name : Uthai series
Classification : Coarse-loamy, mixed, semiactive, isohyperthermic
Oxyaquic Paleustalfs
Date of examination : February 18, 2014
Described by : Danai Sanchanthong, Krishna Rammasoot,
Pochara Ariyaskul and Meta Srithongkhum
Location : Pa O abbey, Ban Pa O, Tumbon Pa O,
Amphoe Lan Sak, Changwat Uthaithani
Elevation : Approximately 140 m (MSL)
Map sheet number : 4939 IV Coordination: 47P 0556500E, 1703576N
Landform
1. Physiographic position : Terrace
2. Surrounding land form : Gently undulating
3. Slope on which profile site : 2 %
Land use : Cassava
Annual rainfall : Approximately 1,141 mm
๐
Mean temperature : Approximately 29.5 C
Climate : Tropical savanna
II General information on the soil
Parent material : Alluvium from mainly granite
Drainage : Moderately well drained to well drained
Permeability : moderate to moderately rapid
Runoff : slow
Depth of ground water : >2 m
II Profile description

Horizon Depth Description
(cm)

Ap1 0-15 Brown (7.5YR 4/3) ; sandy loam; weak medium
subangular blocky structure; loose, very friable, non
sticky and non plastic; many fine interstitial pores; many
fine to medium roots; moderately acid (field pH 6.0);
clear, smooth boundary to Ap2.

Ap2 15-25/30 Brown (7.5YR 4/3) ; sandy loam; weak medium
subangular blocky structure; soft, very friable, non sticky
and non plastic; many fine interstitial pores; common
fine to medium roots; moderately acid (field pH 6.0);
clear, smooth boundary to Bt1.