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Research articleA field experiment on FAO CROPWAT model simulated water requirement and yield reduction estimation under different moisture regimes in wheat was conducted during rabi seasons of 2010- 11 and 2011-12. Crop water requirement of wheat as estimated by CROPWAT model was 286.7 mm during 2010-11 and 304.9 mm during 2011-12. The reduction in cumulative yield under various moisture regimes predicted by CROPWAT model was 3.9, 9.1, 14.6 and 19.3% during crop season 2010-11 and 2.8, 8.6, 11.2 and 20.1% during crop season 2011-12 respectively. The yield reduction as simulated by CROPWAT model under different moisture regimes was closely collaborated with the actual yield reduction. The treatment CRI + 100 mm CPE in main plot and SH + Mycorrhizae + KCl spray + Kaolin spray in sub plot produced higher grain, straw and biological yield.Not Availabl