In order to maximize the water and fertilizer use efficiencies and minimize the losses of water and fertilizer solutes (N and P), it is necessary to assess the influence of levels of fertilization and irrigation schedule on movement and balance of water and fertilizer in the root zone. With this goal, field and lysimetric investigations were undertaken on a coarse textured lateritic soil at the experimental farm of Agricultural and Food Engineering Department, Indian Institute of Technology, Kharagpur. The experimental crops were wheat (cultivar Sonalika) and rice (cultivar IR 36). Experiments were conducted in the winter (Rabi) season for the wheat crop during the years 2002-03, 2003-04 and 2004-05. Rice crop experiments were conducted during the Kharif (monsoon) season of the years 2003, 2004 and 2005. During the wheat crop experiment, the irrigation treatments were: I1 = 10% maximum allowable depletion (MAD) of available soil water (ASW); I 2= 40% MAD of ASW; I3 = 60% MAD of ASW. The fertilizer treatments during the experiment were: F1 = control treatment with N: P2O5: K2O as 0:0:0 kg ha-1; F2 = fertilizer application of N: P2O5: K2O as 80:40:40 kg ha-1; F3 = fertilizer application of N: P2O5: K2O as 120:60:60 kg ha-1 and F4 = fertilizer application of N: P2O5: K2O as 160:80:80 kg ha-1. During the rice crop experiment, fertilizer treatments were: F1 = control treatment with application of N: P2O5: K2O as 0:0:0 kg ha-1; F2 = fertilizer application of N: P2O5: K2O as 80:40:40 kg ha-1; F3 = fertilizer application of N: P2O5: K2O as 120:60:60 kg ha-1 and F4 = fertilizer application of N: P2O5: K2O as 160:80:80 kg ha-1. In this study HYDRUS-1D model was used to simulate one dimensional water flow and solute transport in variably saturated porous media whereas CERES models of the DSSAT v4.0 were used to simulate the growth, development and yield of rice and wheat crops with the help of soil, daily weather and management inputs, to aid farmers in developing long term rotational strategies.