The present research seeks to determine the applicability of simple, rapid and economic methods tor comparing the soil erodability under twelve cultivation systems, and besides to record the features of rill erosion under ale crops in the watershed area of the Otun river. Here the denudation processes are common and affect a large portion of the area. The erodability tests considered (crumb, pinhole, manipulation, rain acceptance, soil loss, shear strenght) are related to soil toss with reference to erodable material and the volume of surface flow. These do not seek to quantify the actual or potential soil loss of a place, but can help in the estimation of the variability of soil erodability with the content of surface gravel, the state soil moisture content and time. To predict the advance of rill and interril erosion in bare soil, Bergsma (1989) developed a semicuantitative system with this purpose, and what is related to the presence and frequency of six microtopography soil surface features after each rain and at the end of tillage: original clods, eroding clods, depressional areas, linear flow pattern of shallow channels and deeper rills, and coverage (vegetation, gravel, etc.); each feature has a length less than 25 cm. The erodability tests demonstrate their practical value with no more than three repetitions per unit of management. There was more soils (8/12) with low erodability. The evolution of microtopograhy soil surface features showed that corn, bean and grass increased depressional areas and shallow channels; the tendency in onion was similar but with a relatibility increase in deeper rills. Bean and grass crops were the less erosion hazard uses because they let a few loss of soil at the more inestable terrains. Contrary, corn and onion are not the most recomendable uses because they allowed the biggest advance of erosion in the most stable soils.