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Most
soil in the south is acid sulfate soil. Such soil comes
from loam or clay piled up with saline soil sediment which
consist of sulfuric compound. After being dried, it becomes
acid sulfate soil.
Hoe to observe
acid soil area in the South
1. Rice
production is not more than 20 liters/rai.
2. In acid soil
plain area where rice is grown, there is no tillering.
When uproot the rice, its root is black. In some area,
rice is withered after transplanting and rice production
decreases.
3. Water in
the area is clear like being swung by alum. Its taste
is acid or sour.
4. There are
plants like grass, reed and Eugenia growing in acid soil
area.
5. Dig the soil
about 50-100 cm. and find sulfuric dust or yellow substance
spread in soil texture.
Area where
acid soil is found
In the
South, acid soil is found in the lowland or the lowland
among sandy bar. Now, such area is the paddy-field or
the farm. Some area is left and covered with grass, reed
and Eugenia.
Important
problem
Acid sulfate
soil causes iron, aluminum and manganese melt and do harm
to plants. Phosphorus could not be applies by plants.
As a result, an amount of crops yield decreases.
How to reclaim
plantation
plantation could
be reclaimed in order to plant crops and vegetables. plot
preparation to prevent acidity of the soil is as the following:
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1.
prepare a plot with 6-8 m. width depending on the kinds
of plants. The furrow is wide 1.0-1.5 m.
2. Dig soil surface
of the furrow and pile it up at the center of the plot .
3. Dig the bottom
soil with 50 cm. depth and pile it up at the edge of the
plot.
4. Prepare the
plot for planting.
5. Build a dike
around the plot in order to prevent the flood. Prepare water
control and drainage by using pump or natural drainage.
After preparing
plantation, improve the soil with soil amendments like dolomitic
limestone or slaked lime 1.5-2.0 ton/rai including irrigation
and maintenance of water level in the furrow to prevent
acidity of the soil.
Three ways
to decrease acidity of the soil
1. Leach acidity
from the soil with water. A large amount of water is used
to control water level in the furrow. When such water becomes
acid sulfate, drain it.
2. Scatter soil
amendments like slaked lime and wallow the soil surface.
3. Apply both
of two ways above. |
