Abstract
The soils containing alkali salts in Tainan prefecture belong to a solonchak, (the underground water soil type) considering from morphological features, physical properties, chemical constituents etc. The exchangeable cations are mainly Mg and Na, though K and Ca also occure, and Ca : (Mg+Na+K) ratio is about 44.6 : 55.4. From these reasons, these solonchaks are considered to be the low-lying flooded alkali soils. According to the climatic conditions, the LANG'S rain factor (74.6) and the MEYER'S N-S quotient (417.2) are higher than those of the climatic alkali soil type. Under these circumstance, the development of these soils require poor drainage as a primary prerequisite for their formation.
