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
coeffi-
cient/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
K
c
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.
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 affecttheevapotranspirationandyieldofsugar-canegrowthgrownintropicalenvironment;2.Thereisacloseassociationbetweencropcoeffi-cient/evapotranspirationandleafareaindexwithcoefficientofdeterminationupto0.88;3.TheKc-FAOcanleadtosignificanterrorsinirrigationschedulingofsugarcaneintropicalconditions.TheKcvaluesderivedfromfieldsoilwaterbalancevariedovergrowingseasonbeing0.18intheinitialgrowthstage,1.06inthemid-seasonand0.76atlatestageofsugarcanegrowthinatropicalregion;4.BothWUEandproductivityincreasedaccordingtoincreasesinwaterlevel,andsugarcaneETrangedfrom2.7to4.2mmday−1.Theyieldforirrigatedsugarcanerangesfrom67.8to136.1t/ha,whichissignificantlylargerthanthatofrain-fed,62.6t/ha.5.ThegreatestpositiveresultinyieldandWUEwasseenin100%ETotreatment.Ontheotherhand,25%ETotreatmentdidnotaffectyieldssignificantlycomparedwithothertreatments,butdidresultinasignificantlyincreasedyieldwhencomparedtorain-fedconditions.
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