Study of irrigation and crop water requirements and growth of two <Emphasis Type="Italic">Rabi</Emphasis> crops grown in a semi arid region using agrometeorology and remote sensing |
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Authors: | S Raut K S S Sarma D K Das |
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Institution: | 1.Water Technology Center for Eastern Region,Bhubaneswar,India;2.Division of Agricultural Physics,IARI,New Delhi,India |
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Abstract: | Irrigation water requirements of wheat and mustard crops grown in Western Yamuna Canal Command area were estimated using FAO
model CROPWAT with the help of agrometeorological and remote sensing data (1986–1998 and 2008). The variations in irrigation
water requirements of these two crops were judged by calculating coefficient of Variations (CVs) of yearly data. Crop coefficient
values were obtained through FAO (1993) method. Supervised Maximum Likelihood Classification (MXL) of IRS 1B image was done
to estimate area under wheat and mustard in the canal command. Water need was calculated from amount of supply and water requirement
for the whole area. Results showed that ETcrop values of both wheat and mustard varied very little over different years (CVs 4.7% and 5.6% respectively). Irrigation water
requirements of both these crops were having relatively large variations (CVs 14.1% and 22.6% respectively) which were mainly
because of high variations of their effective rainfall (CVs 61.1% and 69.2% respectively). In general, increase in amount
of irrigation enhanced the growth performance of the wheat crop. Increase in distribution equity within soil associations
slightly improved the growth performance of the wheat crop. Agro-climatic data merged with satellite image approximated the
deficiency of applied irrigation amount (549.5 ha-m for wheat and 692.7 ha-m for mustard) as compared to requirement. |
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