Integrated analysis of soil fertility status in citrus orchards in China
The aimed to elucidate the current status of soil fertility in the main citrus-producing regions of China,explore the soil limiting factors that restrict citrus growth,and provide valuable insights for citrus nutrient management.To achieve this,the published literature on soil nutrients in citrus orchards were collected to performed integrated analysis,examined soil nutrient content and abundance status,and conducted a comprehensive soil fertility evaluation.The results showed significant insights into the soil conditions of citrus orchards across China.The average soil pH,organic matter,available nitrogen,available phosphorus,available potassium,exchangeable calcium,exchangeable magnesium,available iron,available manganese,available copper,available zinc,available boron and available molybdenum were recorded as 5.53,17.6 g/kg,92.3 mg/kg,60.1 mg/kg,162 mg/kg,1294 mg/kg,161 mg/kg,58.3 mg/kg,39.5 mg/kg,2.97 mg/kg,3.54 mg/kg,0.46 mg/kg and 0.29 mg/kg,respectively.Soil pH in 56.0％of the orchards was below 5.5.Moreover,deficiencies in exchangeable calcium,exchangeable magnesium and available boron were observed in 51.2％,38.5％and 63.6％of orchards,respectively.In contrast,more than 50％of the orchards showed satisfactory(medium or high)levels of soil organic matter,available phosphorus,available potassium,and trace elements except for available boron.The average soil integrated fertility index(IFI)of citrus orchards in China was 0.52.The IFI in western Hubei-Xiangxi was 0.56,which was significantly higher than those in Zhejiang-Fujian-Guangdong(0.51)and Gannan-Xiangnan-Guibei(0.47).The IFI of the Gannan-Xiangnan-Guibei area was substantially lower than that in the upper and middle reaches of the Yangtze River(0.53).The IFI below medium class in different main producing areas was 7.14％-32.3％.The soil available phosphorus,available potassium,and microelement concentrations(except available boron)in citrus orchards of China were at the middle or high level.The results showed low soil pH,insufficient available nitrogen,and deficiencies in exchangeable calcium and available boron were the potential limiting factors in citrus orchards.To address these challenges,focusing on soil management strategies should be pivotal.For example,alkaline fertilizers or lime application could mitigate soil acidity,while increasing organic fertilizer application and optimizing nitrogen,calcium,and boron fertilizer could address nutrient deficiencies.Hence,citrus cultivation in different regions should be adapted to local conditions and complemented with agricultural management measures.This approach may improve soil fertility in citrus orchards,promote citrus quality and efficiency,and achieve sustainable development of the citrus industry.
万方数据
维普
