The invention belongs to the technical field of citrus reiculata Blanco planting, and particularly relates to a nanometer
calcium fertilizer foliage application method for preventing
sunburn and improving
calcium absorption and coloring effects of citrus reiculata Blanco, which comprises the following steps: S1, selecting a citrus reiculata Blanco
orchard, and performing ploughing,
soil preparation, fertilization and watering by a conventional method; s2, adding 6-10 times by
mass of clear water into the nano
calcium carbonate fertilizer; s3, from June to August, uniformly spraying the nano
calcium carbonate fertilizer solution to the fruit surfaces and the leaf surfaces of the citrus reiculata Blanco; and S4, other management is carried out according to a conventional method. Whole-
plant spraying is adopted, the spraying period covers the whole summer high-temperature period, the
sunburn fruit rate can be reduced, the yield can be increased, and
normal growth of fruit trees is guaranteed; in addition, the calcium element of fruits can be supplemented, fruit dropping is reduced, the fruit value is improved, meanwhile, the peel brightness can be reduced, the red
chromaticity is improved, and the fruit commodity value is improved. Therefore, the method has great application potential in expanding calcium fertilizer functions and improving citrus reiculata Blanco benefits.