The application discloses a
nitrogen-
potassium-
calcium ratio fertilization method for improving the
sucrose content of pineapple fruits, and relates to the technical field of
fruit tree cultivation.The specific steps of the method are as follows: firstly, the
nitrogen-
potassium-
calcium ratio is adjusted according to the
soil pH value; during the vegetative growth period, the compound nutrients are supplied regularly to cultivate strong plants; during the fruit swelling period, the same ratio of
fertilizer is applied to directionally control the
sucrose metabolic
enzyme activity; the special
fertilizer liquid is supplied to the leaves in batches to form the
nutrient supply combining soil application with foliar spraying; finally, the
sucrose content and
enzyme activity are detected to verify the fertilization effect; according to the
soil pH value and the root
absorption efficiency, the base
fertilizer is dynamically adjusted, the hindering of the acid-alkali imbalance to the root absorption is eliminated, and the material basis for sucrose accumulation is consolidated from the source; during the fruit swelling period, the
nitrogen-
potassium-
calcium synergistic regulation is used to control the sucrose metabolic
enzyme activity, the
nutrient supply combining fast and slow is formed through foliar spraying, the root and leaf absorption channels are maximally utilized, finally, the effect is verified through harvesting and detection, and the stable improvement of the sucrose content of the fruits is realized.