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Title
Remote sensing for resources development and environmental management
Author
Damen, M. C. J.

Table 1« Electrical Conductivity Standards for plant growth.
487
ELECTRICAL
2
Saturation
extract
CONDUCTIVITY mmhos/cm
at 25°C
1:5 soil to water
suspension
RELATIVE LEVEL OF
SOLUBLE SALTS
PLANT GROWTH RESPONCE
2
0.1
Low non saline
No injury to plants .
2-4
0.1-0.4
Medium slightly
saline.
Very salt sensitive plants may
be injured.
cc
1
-cr
0.4-0.75
High moderately
saline.
Injurious to salt sensitive plants
8
0-75
Excessive strongly
Very injurious to many plants of
any age only salt tone cant crops
can grow.
2. \vith regard to soils fertility in
almost all of the soil profile sites samp
led and analysed, the soils have a defici
ency of sodium, potasium, calcium and ma
gnesium. It is therefore necessary to
raise the levels of the macronutrients by
the application of fertilizers. From the
soils analytical data, also the soils have
reasonable amounts of available phosphorus,
nitrogen and organic matter.
3. The soils in the study area range from
deep sand, excessively drained, (northwest
part of the farm) to sandy clay loams (in
the middle part of the farm). They were
classified as canbic Arenosols, utric
gleysols (mapping unit c). The Alluvial
flood plain consists of deep poorly drai
ned heavy clay soils. They were classified
as Eutric Fluvisols, Utricgleysols and
pellic Vertisols (mapping Unit A).
REFERENCES
CIDA, 1979. Coast Dar es Salaam Regions
Water Master Plan Report Vol. B. Land
Resource s.
Goosen D, 1967. Aerial photointerpretation
in soil survey SOIL Bui. 6 FAO Rome.
Nyle C. Brady 1968. The Nature and
Properties of soils.
4. CONCLUSION
1.
From the analyti
cal re
sul
t s
, it can
be con
eluded tha
t the
f e r t i 1
ity
0
f the
soil i
s 1 ok e s p e
cially
in th
e c
oa
stal
plain
area. How r
ever ,
d e pe nd
ing
u
pon the
crops
to be plan
ted t h
e alluvia
1
plain
area n
eeds littl
e fort
ilizat
ion

2.
Due to the
fine
textur
e 0
f
the soils
in the
alluvial
flood
plain,
wa
te
r does
not dr
ain easily
. Ser
ious d
ama
ge
may be
caused
to heavy
soils
by plo
rgh
in
g when
soil s
are too w r e
t. Th
is c au
ses
i
mpemeable
pans ,
compac tion
and s
mearin
g «
ff
ect of the
soils.
Therefor
e i t i
s reco
mmend
ed that
proper
farming methods
, use
of
th
e required
f armin
g machines
and i
mpleme
nt s
shotild be
ad opte
d in order
to pr
e serve
go
od
soil
struc t
ure .
(
3.
Soil manag
ement
practi
ces
«. g .
instal
lation of
an und
ergrou
nd
ti
le d r a-
inage system) aimed at improving the
soils drainage would be necessary.
4. Fairly accurate and economical soil
surveys for agricultural development
planning can be achieved by using aerial
photographs. Tanzania has good aerial
photography coverage lor natural resources
inventories and exploitation. Therefore
it is recommended that aerial photo inter
pretation should be user! as a tool in soil
surveys.
enforced.
It has to be emphasized and