随着市场经济的繁荣,国内外市场对苹果色泽的要求越来越高。尤其对红星、红冠、超红、艳红等,要求着色面积在90％以上,而且越红售价越高。为生产出色泽鲜红的苹果,除引栽红色优良品种、改善树体通风透光条件、增施有机肥特别是磷钾肥之外,尚需采用人工增红措施。下述办法可供参照选用。 With the prosperity of the market economy, the demand of domestic and foreign markets for apple color is getting higher and higher. In particular, Red Star, Red Crown, super red, red and so on, requires more than 90% of the coloring area, and the more red the higher the price. To produce a bright red apple, in addition to the introduction of red fine varieties, improve the tree light conditions, additional organic fertilizer, especially phosphorus and potassium, the need to use artificial red measures. The following options for reference.