Efect of Temperature on a Nutriment Formulation MODEL for Sorghum CROP.

Some nutriment formulation models calculate de amount of nitrogen, phosphorus and potassium (N-P-K) using some mathematical relationships between an environment factor and the amount of nutriments needed. But the effect of temperature has not been included. An analysis of different growing conditions throughout Mexico growing regions for sorghum had showed that is possible to include the effect of temperature in a nutriment formulation model that uses water availability and the amount of N-P-K. Growing temperature range for sorghum crop may go between 21 to 27 ͦC, considering as optimum 27 ͦC. If the temperature reduces from27 ͦC, this optimum, general plant metabolic reduces, due to possible reduction of enzyme velocity. Then the yield is reduced and also the amount of N-P-K required.