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试验在本所盆栽场控制条件下进行,用沙溪庙组幼年紫色土,含1.0%的caCO_3并加进1.5%的Cao,pH7.7。定植枳砧锦橙幼苗,共计10组处理,试验进行了3年。CK在pH7.7的土壤条件下,枳砧锦橙显典型缺铁黄化以至白化,濒于死亡。经灌硫酸与施硫磺处理,都使土壤pH降力4.8-5.0,枳砧锦橙叶色浓绿,生长最佳。埋沙供铁处理时间虽然只有一年半,但在沙穴中须根增加很多,从而增加了对铁的吸收,促进了锦橙显著的复绿与生长。靠接耐碱砧木两年,使锦橙须根增加最多,秋叶叶色及柑桔的生长均比较正常,且效果愈益明显。埋瓶法虽有效果,但引起严重落叶。在春悄生长期施用颗粒整合铁肥,春叶有复绿效果,但很快失效,秋叶仍黄化。叶面喷布Fe-EDTA与FeSO_4无效,只显斑状复绿。
The experiment was carried out under potting field control conditions in this study. The juvenile purple soil from Shaximiao Formation contained 1.0% caCO_3 and added 1.5% Cao, pH7.7. Trifoliate orange tree seedlings planted anvil, a total of 10 groups were treated for 3 years. Under the condition of soil pH7.7, Citrus aurantium showed typical iron deficiency and yellowing and even died of whitening. Sulfuric acid treatment and sulfur treatment, the soil pH drop force 4.8-5.0, Poncirus angels Broccoli leaves dark green color, the best growth. Although only a year and a half, the time required for the treatment of buried-sand iron supply increased much in the sand cave, thereby increasing the absorption of iron and promoting the significant re-greening and growth of the Jincheng orange. By two years of alkali-resistant rootstock, so that the largest increase in bristles, the growth of autumn leaf color and citrus are more normal, and the effect more and more obvious. Buried bottle method, although effective, but caused serious deciduous. In the spring quiet growing period of application of particle integrated iron fertilizer, spring leaves have complex green effect, but soon failed, autumn leaves are still yellow. Foliar spraying Fe-EDTA and FeSO_4 is invalid, only showed spot-like complex green.