다공질필름 멀칭과 황산칼륨 엽면살포에 의한 ‘홍로’ 사과의 과실품질

We investigated the effects of coloring agent and potassium sulfate (K₂SO₄) foliar sprays, and reflective aluminium and porous film covering on the orchard floor on the enhancement of red peel coloration in ‘Hongro’ apples. Foliar spray of coloring agent and potassium sulfate, and reflective aluminium film mulching before harvest increased the Hunter a value and anthocyanin content of fruit peels at harvest. In addition, micro-porous film mulching had the best effect on promoting red peel coloration in the fruits in the lower and inner canopy, non-colored fruit parts, and fruit calyx-end part due to improved light irradience. Although no statistical differences were detected in fruit weight, firmness, and acidity at harvest, the soluble solids content (SSC) of fruits was increased by coloring agent foliar spray. Reflective aluminium film mulching had the highest incidence of fruit sunscald at harvest. However, porous film mulching did not affect the sunscald occurrence of control fruit. Therefore, the result indicated that porous film mulching at 20 or 30 d before harvest is the most effective for promoting red peel coloration.