ASSESSMENT OF CLIMATE CHANGE IMPACT ON RAIN WATER PRODUCTIVITY IN SEMI-ARID ALFISOL THROUGH AQUACROP MODEL IN MAIZE (Zea mays L.)
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Date
2015-06-30
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UNIVERSITY OF AGRICULTURAL SCIENCES, RAICHUR
Abstract
The rainwater harvesting in the semi arid regions enhance the livelihoods of rainfed
farmers by mitigating the dry spells under changing climate. The present study was laid out
in a split-split plot statistical design with three replications. There were five main irrigation
treatments viz., I0, I1, I2, I3, I4, two sub treatments viz., M0 (no mulching), M1 (mulching @
5 t ha-1 with glyricidia) and two sub-sub treatments viz., NF (normal fertilizer) and HF
(high fertilizer) to study the effect of supplemental irrigation and crop management
practices on maize grain yield and water productivity in semi arid alfisols of Telangana
state. The results of the present study showed that, the highest average grain yield of 3.19 t
ha-1 was recorded in I4 and lowest was in I0 (1.78 t ha-1). The highest average water
productivity (10.65 kg ha-1 mm-1) was recorded in I4 followed and the lowest was in I0
(7.60 kg ha-1 mm-1). The developed crop water production functions indicated that, the
grain yield was increased with increase in depth of supplemental irrigation. The AquaCrop
model was calibrated for simulation of grain yield, biomass and water productivity for all
treatment levels and the prediction error statistics were 0.94 < E < 0.95 %, 0.06 <RMSE<
0.12 t ha-1 and 0.59 <MAE< 0.82 t ha−1. During the validation, model performed well with
model efficiency of 91, 90 and 73 % for grain yield, biomass and water productivity
respectively and is within the acceptable limits. Under the changing rainfall and air
temperature, the maize grain yield in rainfall in rainfed condition can be sustained by
application of supplemental irrigation of 50 mm with expected increase by 75, 80 and 85
per cent in time scenarios of 2020, 2050 and 2090 as compare to kharif 2013 in
Rangareddy district of Telangana state.
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