COMBINED NPK MODEL

The combined model uses the principle of the ‘Law of the Minimum’ to calculate actual daily increments in plant weight and uptake of each nutrient based on the nutrient least able to meet the plant requirements. Account is also taken of soil factors such as the dependence of soil solution K on the level of mineral N.

Flow Diagram of the Combined Model

REFERENCES

GREENWOOD, D.J., MCKEE, J.M.T., FULLER, D.P., BURNS, I.G., & MULHOLLAND B.J. (2007). A novel method of supplying nutrients permits predictable shoot growth and root/shoot ratios of pre-transplant bedding plants. Annals of Botany. 99: 171-182.

ZHANG K., GREENWOOD D. J., WHITE P. J., & BURNS I. G. (2007). A dynamic model for the combined effects of N, P and K fertilizers on yield and mineral composition; description and experimental test. Plant and Soil 298:81-98.