Ecological balanced fertilization:II.Fertilization parametric norm system

The method of how to determinate fertilization feature parameters in fertilization model is presented.Experiments show that all valid data from field tests can be served as original data for fertilization model determination.Without above data,the feature parameters can also be determined by experts inquiry or questionnaire.Further,several common fertilization models are discussed in their advantage and disadvantage as well as their relationship with the general fertilization model.