23
ranges between 2.5-3.0 meters.
7he soiOs in the DreD Dre tySified Ds being chOoride sXOIDte tySe
saline-sodic soils, with the climate and special geographical
conditions combing to make this region liable to accumulate
salt on the soil surface.
The nutrient concentration of soil samples at different soil
depths are shown in Tables One and Two.
Plot layout and irrigation water management
7he tests coYered D totDO oI fiYe ZDter treDtPents (S1-S5)
based on the SMP, measured with tensiometers located at
a depth of 20 cm beneath a dripper, situated near the center
of the plot for each treatment (See Figure One).
Treatments were replicated three times in a completely
randomized block design, made up from plots consisted of
twenty rows of cotton planted on 10 raised (15 cms) beds,
spaced at 0.8 meters apart.
The beds were mulched with white polyethylene sheets after
sowing. Each bed was 0.4 meters wide and 3.8 meters long,
while the plots were eight meters long by four meters wide.
Each treatment area was irrigated using an independent
irrigation system that consisted of a water tank containing
1000 liters to which 30 drip lines were attached, at the ratio
of ten tubes per plot, with the tank placed at a height of one
meter above ground level in order to maintain water pressure.
The drip tubes, with 20 cm emitter intervals between each
dripper were placed at the center of each raised bed.
To enable the seedlings to emerge, 40 mm of water was
applied to all treatments immediately after seeding, while
scheduled and irrigation treatments were initiated around
three weeks after seeding in each of the three years that
the tests were held.
The on-site tensiometers were read three times daily at
8:00, 12:00 and 18:00.
Plant management
Seeds of cotton were sown on during the second week in
May for the three years of tests. The cotton seeds were
Ami Tens Ltd., Hahadarim 36, Ashdod, Israel, P.O.B. 12096 .Tel:972-8-8523236: Fax:972-8-8523964,
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