国光苹果在果实成熟期干旱、采收前多雨或暴雨情况下,果实裂果严重,降低果品质量,造成不应有的损失。根据陕西省果树所的试验介绍及我省青岛园艺总场、泗水县城关公社西洼大队和长清县万德公社万南大队1975年都进行了试验,在果实裂果之前30天左右,喷布2000～4000ppmB9,对减轻和 Guoguang apple in the fruit ripening period of drought, before harvest rain or heavy rain, the fruit cracking serious, reducing fruit quality, resulting in undue loss. According to the introduction of the experimental results of Shaanxi Province fruit trees and Qingdao horticultural field in our province, Surabaya County Chengguan commune Xiwa unit and Changde County Wande commune Wannan brigade were tested in 1975, 30 days before the fruit cracked, spraying 2000 ~ 4000ppmB9, to reduce and