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在含CaCO_31.33～7.72的紫色土上,13年生枳砧伏令夏橙发生轻度至重度缺铁失绿症,单株年产量与CaCO_3含量呈极显著直线负相关。其原因是CaCO_3使土壤pH 升高,碱性使土壤活性铁失效,植株吸铁量减少,叶绿素含量随之下降,致使伏令夏橙减产和糖、酸含量降低。根据产量分析,伏令夏橙春叶含Fe量<40ppm 时为严重缺铁,40～60ppm 为缺铁,60～80ppm 为偏低,90～130ppm为最适。
On the purple soil containing CaCO3 -31.33 ~ 7.72, the annual 13-year-old Poncirus trifoliata had slight to severe iron deficiency chlorosis in summer orange, the annual yield per plant was significantly negatively correlated with the content of CaCO_3. The reason is that CaCO_3 increased soil pH, alkaline soil failure of the active iron, reduced iron absorption, chlorophyll content decreased, resulting in summer decoction production and sugar, acid content decreased. According to the yield analysis, the Voxian summer orange leaves with a Fe content less than 40ppm are seriously deficient in iron, 40-60ppm are iron deficiency, 60-80ppm are low and 90-130ppm are the most suitable.