application amount was set to 300 kg N ha-1. Elemental nitrogen and elemental phosphors were selected as the main fertilizer. The major crops heat units to reach maturity were initially based on Figure A2.13 and then calibrated. Remaining crop parameters and parameters for non-crop land covers, originate from SWAT default database (Neitsche et al., 2009). Parameters sensitive to model outputs were also subsequently calibrated to the local conditions. A2.11: A2.12: A2.3: A2.13: The nitrogen stress threshold, which is a fraction of potential plant growth, was set to 0.95 which ensures that there is almost no reduction of plant growth due to nutrient stress. Any time actual plant growth falls below this threshold fraction due to nitrogen stress, the model will automatically apply fertilizer to the HRU. The nitrogen stress factor is calculated by dividing the growth of the plant undergoing nitrogen stress by the growth of the plant if there was no nitrogen stress. The application efficiency was set to 1.3 to allow the model to apply fertilizer to meet harvest removal plus an extra amount to make up for nitrogen losses due to surface runoff/leaching. Fraction of fertilizer applied to top 10 mm of soil is 0.8. Irrigation was based on plant-water-stressed automatic scheduling, and withdrawn from outside sources so that the model will add water to the soil until its field capacity. The automatic irrigation option is triggered by water demand. Water stress threshold which is a fraction of plant growth is assumed to be 0.95 to ensure that there is no reduction of plant growth
application amount was set to 300 kg N ha-1. Elemental nitrogen and elemental phosphors were selected as the main fertilizer. The major crops heat units to reach maturity were initially based on Figure A2.13 and then calibrated. Remaining crop parameters and parameters for non-crop land covers, originate from SWAT default database (Neitsche et al., 2009). Parameters sensitive to model outputs were also subsequently calibrated to the local conditions. A2.11: A2.12: A2.3: A2.13: The nitrogen stress threshold, which is a fraction of potential plant growth, was set to 0.95 which ensures that there is almost no reduction of plant growth due to nutrient stress. Any time actual plant growth falls below this threshold fraction due to nitrogen stress, the model will automatically apply fertilizer to the HRU. The nitrogen stress factor is calculated by dividing the growth of the plant undergoing nitrogen stress by the growth of the plant if there was no nitrogen stress. The application efficiency was set to 1.3 to allow the model to apply fertilizer to meet harvest removal plus an extra amount to make up for nitrogen losses due to surface runoff/leaching. Fraction of fertilizer applied to top 10 mm of soil is 0.8. Irrigation was based on plant-water-stressed automatic scheduling, and withdrawn from outside sources so that the model will add water to the soil until its field capacity. The automatic irrigation option is triggered by water demand. Water stress threshold which is a fraction of plant growth is assumed to be 0.95 to ensure that there is no reduction of plant growth
D%205.4.docx