The invention discloses a fertilization optimization method for promoting the increase of the leaf area of
malus spectabilis, and relates to the technical field of
plant fertilization, and the method comprises the following steps: step 1, selecting
malus spectabilis plants with consistent characteristics, planting the
malus spectabilis plants in selected soil according to a preset line spacing, and dividing the planted
malus spectabilis plants into a plurality of groups; 2, applying compound fertilizers with different proportions to each group of
malus spectabilis plants at the fertilization nodes; 3, measuring the leaf area mean value of each group of
malus spectabilis plants at the measurement nodes; and 4, fitting a regression equation according to the compound
fertilizer ratio and the corresponding leaf area mean value, and screening out an optimal compound
fertilizer ratio range by utilizing the regression equation according to a preset result constraint. The accuracy and effectiveness of the fertilizing amount can be improved, and the leaf area of the malus spectabilis can be increased.