Modelling Maize Nutriment Fertilization N-P-K, for Mexico.

It is always a problem to define a fertilization formulation (N-P-K) for maize crops in Mexico. Some say that if you know the amount of nutriments the crops is going to acquirer, amount of nutriments per ton of grains produced or similar relationship, then just calculate the amount of nutriments needed. The problem is that how to calculate the possible maize yield for a crop field, if fields are different in their productivity, due to different climate, water availability, soil type and depth, maize variety, etc. It is like it would be possible to have the same yield using the same production system, without considering that crop fields are different. It is the amount of production resources that the crop field has that define the production system to use, and the amount of nutriments is part of it. This amount is different if crop field are different. Temperature, soil, water availability, etc., are important factor that define the amount of resourses that a crop field has, its richness. Among these factors, probably the amount water or water availability is the most important to consider for a maize mathematical model. Mexico has different maize production regions that have different production resources. Mathematical models were developed using the information of nutriment formulations for each region and its amount of water availability. Using this mathematical model is possible to define the amount of nitrogen, phosphorous and potassium needed for a maize field, just knowing its amount of water availability.