Abstract: By analyzing the latest research on fertilization management in rapeseed,a dynamic knowledge model for decision-making on total rates of nitrogen,phosphorus,potassium and boron,ratios of organic to inorganic nitrogen and of basal to dressing nitrogen,phosphorus and potassium under different environments was developed with the principle of nutrient balance and by integrating the factors of grain yield target and soil characters.With the data sets of different eco-sites,soil types and target yields,case studies indicated that the model had a good performance in decision-making and could be applied widely.

Key words: Chl a, N, P, K, Microcystis spp