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start:hype_model_description:hype_np_soil [2024/02/15 10:55] cpers [Potential vegetation uptake of nitrogen] |
start:hype_model_description:hype_np_soil [2024/02/20 17:21] (current) cpers [Potential vegetation uptake of nitrogen] |
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{matrix{2}{2}{{MIN[1,(T-5)/20]} {T>5} 0 {T<5}}} </m> | {matrix{2}{2}{{MIN[1,(T-5)/20]} {T>5} 0 {T<5}}} </m> | ||
- | with //T// the air temperature. The growing period will then continue next season from //bd2// as described above. For simulations with shorter time step than one day, the nutrient uptake, calculated above with temperature (//T//) for the time step, is divided by the number of time steps per day to get the uptake for this time step. | + | with //T// the air temperature. The growing period will then continue next season from //bd2// as described above. For simulations with shorter time step than one day, the nutrient uptake, //uptake// above, is calculated with temperature (//T//) for the time step, and is divided by the number of time steps per day to get the uptake for this time step. |
The start of the growing season/sowing date (//bd2//) may be given as a constant, or calculated dynamically depending on temperature. This is set by a model option. If the growth start is dynamically determined it is set to the first day of the year which has a degreeday sum (//GDD//) above a threshold (//gddsow//). | The start of the growing season/sowing date (//bd2//) may be given as a constant, or calculated dynamically depending on temperature. This is set by a model option. If the growth start is dynamically determined it is set to the first day of the year which has a degreeday sum (//GDD//) above a threshold (//gddsow//). |