159 
26 0 9°C, while the difference between summer and winter temperature is 
of the order of 7.4°C. 
:uer eine 
eise für 
ersucht, 
:>erflächen- 
n zickzachen 
J3 Bildern. 
Erdoboden- 
febiet von 
ifolgt, die 
Physiographically the area has two distinct regions viz. (1) 
Hills and (2) Plain. The western hilly region running from north to south 
comprises somewhat rugged hills interspersed with some conical hillocks 
with steep escarpments. The average elevation ranges from 365 to 46 0 
meters above M.S.L. excepting those of the conical peaks. The hills 
are longitudinal, flat topped and the whole structure seems to have been 
dislocated as indicated by a fault line parallel to the longitudinal hills. 
The area is mostly dissected by streams flowing transversely to the main 
structure; it supports some forest and scrub vegetation. 
Jodenkarte 
sr Boden- 
let wurde. 
rde eine 
Almost the entire plain area is under cultivation. Most of the 
cultivated area is under paddy crop and is made up of well bunded 
fields. 
mterworfen, 
gefunden, 
METHODS 
grad hatte, 
lode, die 
5 Boden- 
timmung und 
Panchromatic air photos with an average scale of 1:25,000 
were used for the photo-interpretation and field work. In all 33 photos 
of format size 18 cm x 18 cm were used for the survey of the 17,750 ha. 
1:63,36 0 Survey of India toposheet was used for base map 
preparation. 
itation 
nown. It 
techniques 
A mirror stereoscope was used for the interpretation of air 
photos at Headquarters and the field camp. A pocket stereoscope was 
used for field work. 
very little 
/ of photo 
using 
Soil augers and other digging implements were used for study 
of soil profile pits; other usual soil survey equipments were also used. 
The soil classification was done according to the comprehensive system 
of soil classification (USDA, I960, 1967 and 1970). 
1:2000 and 
d could be 
Procedure: 
. areal extent, 
accurate 
1:15,000 or 
e photos are 
ist the 
techniques 
en. It 
is used here, 
oil Surveys". 
Surhi sub- 
In keeping with the objective of the study, a procedure 
analogous to the one employed for medium and small scale soil mapping 
was adopted; such a basic procedure has been described by Shamacharya 
and Srinivasan (1972) . In essence the steps comprise (i) brief prelimi 
nary study of a loose mosaic of the air photos (ii) a brief initial 
reconnaissance of the survey area (iii) preliminary photo-interpretation, 
based on which a sample strip is selected (iv) very detailed soil survey 
of the selected sample strip to establish the soil composition of the 
photo analytical units (v) final photo-interpretation of all the 33 air 
photos on the basis of the findings of the study of the sample strip and 
(vi) a limited selective check of areas falling outside the sample strip 
for verification of the photo-interpreted soil map. 
0 2'30 to 
s an area 
Pradesh in 
the mean 
red during 
iperature is 
In order to test the accuracy of the soil map prepared accord 
ing to the procedure described in the previous paragraph, a section of 
the soil map was subjected to an intensive gridded soil survey. No 
prior soil observations had been made in this selected section during 
the entire survey.