Soil-plant relationships at moderately to strongly salt affected places in the Northeast Thailand
1991
Nayana Puengpan (Khon Kaen Univ. (Thailand). Faculty of Science. Dept. of Chemistry) | Terdsak Subhasaram | Shiraishi, K.
Soil-plant relationships were examined at moderately to strongly salt-affected places near Ban Phra Yun, Khon Kaen Province. Weeds flourishing in the rainy season ("rainy season weeds") and those in the dry season ("dry season weeds") were different. Most of the "rainy season weeds" seemed to be tolerant to both moderate salinity and a reductive state of the soil. On the contrary, most of the "dry season weeds" were tolerant to high salinity but not tolerant to a reductive state of the soil. This was considered to result from an adaptation of weeds to the alternating environments of soil. In the rainy season, salinity of the soil was decreased and the soil, especially at the places with shallow impermeable layers, was reduced and in the dry season, salinity of the soil was increased and the soil was kept oxidized. Heterogenous distribution of native weeds was caused by microrelief such as small ridges as well as by the presence or absence of the impermeable layers at shallow depths. Seedlings of trees such as Eucalyptus succeeded to establish themselves when they were planted at the places where the "rainy season weeds" could grow. The places with stagnant water, including paddy fields, were considered to have some mechanisms to decrease salinity. A few promising techniques to cultivate plants at moderately to strongly salt-affected places were proposed.
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