| Author | Ariyabandu, Rajindra de Silva |
| Call Number | AIT Thesis no. AE-86-08 |
| Subject(s) | Soils--Classification
|
| Note | A research study submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Four soil series namely, Ayutthaya, Bangkok, Chacheongsao and
Rangsit, located on the Eastern side of the Chao - Phraya were
selected for this study. Variations in soil properties were
investigated, based mainly on soil profile characters and
profile observations. The study revealed that these soils belong
to order Inceptisols (no sulfidic material within 50 cm of the
soil profile). Ayutthaya and Rangsit series soils belong to
Sulfic Tropaquepts while Bangkok and Chacheongsao series soils
belong to Typic Tropaquepts. Ayutthaya and Rangsit had a well
developed profile with red mottles well distributed while Bangkok
and Chacheongsao profiles were still in the process of
development with few red mottles in the B- horizon. Gypsum content
was high in the Bw1 and Bw2 horizons of Ayutthaya
profile. Moisture content of Bangkok and Cacheongsao profile
horizons were higher than the same horizons of Ayutthaya and
Rangsit. pH values of Bangkok and Chacheongsao subhorizons were
nearly neutral to slightly acidic, while in Ayutthaya and Rangsit
the pH values were highly acidic. Available Potassium was high in
all the horizons with highest concentration in the subhorizons of
Bangkok and Chacheongsao . Availability of Phosphorous was low
under acidic conditions in al l the horizons. Concentrations of
sulphates and ferrous were high in Bangkok and Chacheongsao
profiles with highest content of ferrous being present in the
plough layer and subsurface horizons of Bangkok and Chacheongsao.
Sulphates move with leaching water in the wet season and with
capillary rise in the dry season. These sulphates are deposited
as gypsum in Bw1 and Bw2 horizons of Ayutthaya profile. Auger
sample analysis revealed that except for Potassium, availability
of most of the other elements were low compared to profile samples. |
| Year | 1986 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Rahman, Md. Ataur ;Apisit Eiumnoh |
| Examination Committee(s) | Nielsen, Jens Moller |
| Scholarship Donor(s) | Government of Australia |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1986 |