Page 162 - Arabian Studies (II)

154 Arabian Studies 11

j Hojar Mountains
-2- Conductivity Values Given
in mmhos/cm at 25°c
*7 l Individual Observation Points

RAS-AL-
KHAIMAHi
o KMS 30
DIGDAGA,
UMM AL
QAIWAIN

SHARJAH

DUBAI/7Ix

Fig. 2. Groundwater salinity, based on water resource surveys of Sir W.
Halcrow and Partners, 1969.

unlined channels. The maximum range of crops is grown in winter,
including tomatoes, aubergines, cabbages, cauliflowers, lettuces,
onions, potatoes, carrots, marrows, herbs and peppers. In winter, it is
very rare for less than 35 per cent of a holding to be cropped and as
much as 65 per cent of the area of a holding may be under vegetables.
The situation is very different in summer when usually no more than
40 per cent of the holding is given over to crops, mainly cucurbits and
melons. In some cases the proportion of cropped land may be as low
as 10 per cent. The main reason for this low proportion of summer
cropping is that, because of the high evapotranspiration rates and the
general high porosity of the soils, the pumps cannot supply more

A