赣南柑桔园背景土壤营养状况分析

对赣南16个县（市）223个代表性柑桔园的背景土壤样品（5～35cm深）进行了测试分析。结果表明,赣南地区有65.0%果园背景土壤pH值适宜或较适宜柑桔生长,95.5%的果园土壤有机质含量偏低,有效氮（碱解氮）、有效磷、有效钾缺乏的果园比例分别为40.8%、91.9%和29.6%,中量元素养分有效钙和有效镁缺乏的果园比例分别为44.8%和89.2%,分别有5.8%、14.4%、44.6%、26.0%和67.3%的果园缺乏有效铁、有效锰、有效锌、有效铜和有效硼。另外,土壤有效钙、有效铁、有效锰、有效锌和有效铜在部分柑桔果园背景土壤中存在过量现象,出现比例分别为3.6%、4.5%、9.9%、2.2%和4.5%。赣南地区柑桔园在目前栽培管理基础上需重视调节土壤pH值及补充有机质、钙、镁和锌肥。 Soil （5-35 cm depth） samples collected from virgin lands surrounding 223 citrus orchards in southern Jiangxi province of China were analyzed. The results showed that the soil pH values in 65.0% orchards were suitable for citrus growth, but soil organic matter（OM） content in 95.5 % or chards was low, and soils deficient in available macro-nutrient of N, P and K were 40. 8%, 92. 8% and 67. 3%,respectively. Soils deficient in available Ca and Mg were 44. 8% and 89. 2%, respec tively, and available Fe, Mn, Zn, Cu and B were insufficient in 5.8%, 14.4%, 44. 6%, 26.0% and 67.2% of the soils, respectively. However, the available Ca, Fe, Mn, Zn and Cu content in 3. 6%, 4. 5%, 9.9%, 2.2% and 4. 5% of the virgin soils, respectively, was excessive. A sugges tion was put forward to southern Jiangxi Province growers to pay more attention to adjusting soil pH values and to application of OM, Ca, Mg and Zn fertilizers.