Abstract— Prediction model was developed to predict suitable field workdays for planting and harvesting operations in South Central Sudan (Damazeen). Predictions were made from a computer model which simulates daily soil moisture in the top 30 cm of soil depth using 11 years of daily meteorological records. The model was tested and validated by comparing its output with the observed workdays during the 2004 farming season on Clay soil types. Results show that there was good agreement between the observed and predicted values using established tractability criteria. A study was conducted to determine the appropriate number of working days in mechanized planting and semi-mechanized harvesting of Sorghum in Damazeen, Sudan in 2010. The number of working days for mechanized planting was estimated about 20 days, and for harvesting was about 23 days with 99% confidence. The allowed limit of soil moisture in clay-loam texture, for having the capability of running field operations was determined to be 14.5% of the weight. In this limit, soil has acceptability of 6.34 mm of water (rainfall) for sowing and 10.62 mm for harvesting at the depth of operation in each turn of rainfall or irrigation. At sowing and harvesting times, 19.3% and 7.5% of the rainfall is converted to runoff. Therefore, the maximum allowable rainfall in a situation that doesn’t change the soil condition from the proper situation for mechanized sowing and harvesting operation is 7.6 and 11.41 mm, respectively, in each rainfall turn. For the drainage of excess moisture after rainfall, in sowing and harvesting operations, five and seven days are required, respectively.
Keywords— simulation model, drainage, proper working days, runoff, soil profile tractability.
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