Complementary irrigation had a significant effect on sugarcane yield so that increases in yield are directly and linearly correlated with increases in the consumption of water. Various irrigations conditions can affect the evapotranspiration and yield of sugar cane growth grown in tropical environment;
2. There is a close association between crop coefficient/ evapotranspiration and leaf area index with coefficient of determination up to 0.88;
3. The K c -FAO can lead to significant errors in irrigation scheduling of sugarcane in tropical conditions. The Kc values derived from field soil water balance varied over growing season being 0.18 in the initial growth stage, 1.06 in the mid-season and 0.76 at late stage of sugarcane growth in a tropical region;
4. Both
WUE
and
productivity
increased
according
to
increases
in
water
level,
and
sugarcane
ET
ranged
from
2.7
to
4.2
mm
day
−
1
.
The
yield
for
irrigated
sugarcane
ranges
from
67.8
to
136.1
t/ha,
which
is
significantly
larger
than
that
of
rain-fed,
62.6
t/ha.
5.
The
greatest
positive
result
in
yield
and
WUE
was
seen
in
100%
ET
o
treatment.
On
the
other
hand,
25%
ET
o
treatment
did
not
affect
yields
significantly
compared
with
other
treatments,
but
did
result
in
a
significantly
increased
yield
when
compared
to
rain-fed
conditions.