ABSTRACT
In many places in Ethiopia, though the amount of annual rainfall seems sufficient for crop production, the distribution is highly variable and erratic. For many crops in the watershed, September is a peak time for flowering and thus water shortage at these stages can cause high yield reduction. Therefore, Supplementary Irrigation (SI) at those phenological stages of the crop can limit yield reduction. Using the CROPWAT model crop water requirement, net-supplementary irrigation requirement and schedule of the water application were calculated with inputs of soil, climatic and crop data. Carrot did not respond to SI. This result revealed that rainfall is enough to cultivate carrot in the area, although it needs to be confirmed by more years of study. The partial budget analysis was done using the straight line depreciation method. By using the straight line depreciation method the cost of pond construction was calculated for one year.
