Method for estimating asymmetrical nutrient effect model parameters: an optimization regression combining method

The paper makes further research on estimating the parameters of the asymmetrical model describing effect of nutrient based on present literature, points out faultiness of the parameters estimating method in present literature, provides a new method for estimating parameter,i.e, an optimization regression combing method. The method not only avoids the above faultiness but also has a precise fitting degree.