1. The problems of low soil fertility and deteriorated from the report
survey and classification, soil of the land run in the province
. Thailand found that most soil with low fertility. Naturally
.Because the country is located in the tropics, high temperature and the quantity of the rain
. The decay of ores and rocks. The object is the source. Of soil is rapid.
.And the leaching of minerals food plants out of the soil in high rate during the rainy season
drift with water that flows into the lower, to the river. And into the sea!Finally, from the decomposition of mineral and rock in the series progresses greatly and rapidly this
makes the earth in mainly consists of clay minerals. Kay Olivier night
(Kaolinite), iron, and aluminum oxide (hydrous oxide clay) which mineral
.Clay, they play the role of absorbing nutrients and changing
positive charge low (low activity clay) so abundance. Soil naturally low 2
. Soil with special problems (problem soils) from surveying and mapping land
.Of the land has found that certain kinds of soil with physical and chemical barrier removal หรือข้อ
in utilization in agriculture. Especially
plant cultivation need development or improvement to enhance
.In the production of the lands, soil with special problems that said this, when separated by state of
problems and restrictions, so the following
2.1 acid sulfate soils Or acid sulfur (Acid Sulphate Soils)
a soil with the value of pH (pH) than 4.0 set, but I next
from soil surface down (SUD surface) and in the floor with a substance yellow straw
happen (jarosite) values of PH may low down to 3.5 or lower. If a
cases, such as. This soil can not what to plant up even, but the rice is often neglected
.As empty grass covered up that cannot grow rice or plant
, otherwise it's due. There are steel and aluminum melt. It is toxic to plants.
and the elements necessary for plant growth.
.Some insoluble is beneficial to plants, especially
phosphorus would be crucified (fixation) and is in the form, not
benefits. To the plants. Therefore, it is considered to be the soil with special problems to
.Improve and modify to benefit in the use of crop
acid sulfate soils or sulfur acid กำมะ t said, found an area about 9.0 million acres. Percentage of area 2.81
or country, found in the central plain south
.Eastern and southern coastal area found scattered in the image area, the น้ำทะเลเคย
flood before
2.2 saline (saline and. Sodic soils) is a soil with salt
water soluble composition to do harm to plants
.Soil, saline soil, found in Thailand was highest in the northeast area is approximately
17 million hectares, or 5.5 percent of the area.
the whole country. Furthermore, saline soil in coastal area (coastal
.Saline soils) space combination approximately 3 million hectares, including with saline soil in the northeast, because
, suitable to 20 million acres, saline soil. This
potential yield plant, plant low, some cannot grow crops
.Now, especially the saline soil, said in the Northeast
with salt crust (salt crusts) appear on the ground surface during the dry season.
, which indicates that the saline soil. The seashore saline is used!In the salt fields, planting fruit by lifting groove, such as coconut and
still state forest cover fellow. Besides, some areas of use.
in aquaculture, such as oysters, shrimp, crab and fish, etc. 2
.3 sandy organized (sandy soils) found in enough divided
a 2 type is the sandy plain sand ที่มีเนื้อที่ held deep. The sandy and layered with Dan capture, hardened by iron and Huo must be
.Welding occur within the in depth 2 meters, but most happen below the 1
m from the skin surface soil. This kind of 2 sandy soil and fertility
naturally low and have the ability to absorb water is low. Besides
.Sandy soil with soil water seep into ice when Dan to soak the trapped because
soil Dan mentioned water through the difficult cause of water locked up. Plant roots
lack of air, plants grown abruptly growth
.At present, sandy have potential in the production of low and limited to
choose the type of plants to be grown, in particular, sandy soil. In the northeast region. And the North during the dry season is dry, and during the
.The delay in rainy season, will dry quickly, such as the same for sandy soil, found in the coastal area, has higher humidity and can be planted some fruit trees
yield. In the fair or quite well in some areas, especially grow
.Coconut, but however, sandy held that's soil. The special need to revise.
For example the fertility, the
can in the WHC of soil and type selection of plants to be grown
2.4 soil mixed fast (skeletal soils) is a soil with posterity nutrients (laterite
or iron stone) rubble (rock fragment) gravel round (Cobble).
the rubble and other happens in depth 50 cm from the skin surface soil and
.In soil mixed with fast, is composed of gravel and rubble of various sizes 2 mm
is more than 35 percent by volume.
the gravel layer. This stone will hinder burrow of plant roots, plants
.The initial growth. Besides, soil with gravel layer rock is often lack of moisture in the soil, soil is simple and more problems. One is that there are limitations.
in type selection of plants and crops if used some type of cable.The trees need to manage the special in preparation for planting hole
soil mixed fast-paced, found in an area about the 52 million hectares or percentage.
16.3 area of the whole country is found in the northeast and the sector
.North is currently used in the little cultivation covered with deciduous forest is clear.
that use less, because the area is mainly posterity nutrients and the rubble in the shallow
.Some found that skin surface soil. The soil is potential in gates a low should develop
a meadow cattle. The use of the most suitable for this type of soil 2.5
soil area swamp or organic soils (organic soils)
.The soil is made in the lowland low (lagoon) with seawater and brackish water
from the sea.
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