Role of Computer Models in Simulating the Effect of Tillage Practices on Drainage Parameters of Soil

Computer models are one of the latest management tools, which may be used to predict or monitor the effect of different cultural practices on the hydrologic properties of soil. Tillage practices play critical role in controlling the hydrologic characteristics of the soil and consequently the drainage efficiency of surface and subsurface drains. Attempt was made to simulate the effect of moldboard plowing and harrowing on the infiltration rate, drainage coefficient, recharge and seepage (lateral flow) under sloping lands using two and onedimensional finite element computer models (FEMWATER and HYDRUS). The simulation of FEMWATER indicated more infiltration to occur under moldboard-plowed soil and lateral flow under harrowed soil where plow pan had developed due to excessive use of disc harrow. This model also indicated seepage to occur at middle slope position due to lateral flow. A good agreement was found between observed and simulated pattern of seeping water. Drainage coefficient and recharge simulated with two and one-dimensional models compared closely with the observed or studied earlier.