Fertility characters and relationship between soil organic matter and nutrients of navel orange orchards in Fuchuan of Guangxi

【Objective】The soil nutrient contents,soil organic matter and p H were surveyed in 9 orchards in Fuchuan,Guangxi in order to provide references of the soil reasonable cultivation and conduct sustainable production. 【Method】Analyzed frequencies and the regression correlations of the soil organic carbon content and main soil fertilities indicators of nine orange orchards in Fuchuan, Guangxi. The soil fertilities including soil organic carbon,p H, total N,available P and available K. 【Result 】The results showed that soil organic carbon,p H,total N,available P and available K were 22.50g/kg,5.63,1.20 g/kg,48.48 mg/kg and 159.76 mg/kg,respectively,which were reached medium and high quality fertility level. Nitrogen and potassium in a few orchards needed to improve1-2 fertility levels,while available P was too high(55.4% was more than 40.0 mg/kg). Soil nitrogen organic matter mainly for direct drive action(path coefficient was0.767),while the soil p H and available K were mainly indirect effects(path coefficients were 0.188 and 0.261). 【Conclusion】Orchard soil nutrient characteristics of Fuchuan shows that,under the existing management measures control phosphate,30% potassium district needs increasing potassium fertilizer,and with the application of limestone powder to improve soil organic matter and soil fertility fertilization methods,thus sustainable quality navel orange production.