红壤甜橙园土壤和叶片营养元素相关性分析

 于2010 年和2011 年在江西省安远县和寻乌县这两大赣南甜橙生产县，共采集181 个红壤枳 砧甜橙园的土壤样品和叶片样品，进行营养元素含量测定，并对土壤和叶片相应营养元素含量进行相关 性分析，为评价测土配方施肥是否适宜红壤甜橙园提供依据。结果表明：土壤碱解氮、交换性钙、交换 性镁、有效铁和有效锌的丰缺状况在甜橙叶片对应营养元素丰缺水平上能得到一定程度的反映；土壤有 效钾、有效磷、有效铜和有效硼的状况则难以在甜橙叶片对应营养元素丰缺水平上得到反映。相关性分 析结果显示，只有2010 年安远县甜橙园土壤有效Zn 含量与叶片Zn 含量呈显著正相关（P < 0.05），其余 土壤有效营养元素含量与叶片对应营养元素含量之间均无显著相关性。表明测土配方施肥不适宜红壤甜 橙园，建议实行以叶片营养诊断为主、土壤诊断为辅的配方施肥策略。

Correlation Analysis on Nutrient Element Contents in Orchard Soils and Sweet Orange Leaves in Southern Jiangxi Province of China

Both soil and leaf samples were collected from 181 red soil orchards of sweet orange grafted on trifoliate orangePoncirus trifoliata（L.）] rootstocks in Anyuan and Xunwu，the two biggest citrus production counties in southern Jiangxi Province of China，and then analyzed for their nutrient element contents in 2010 and 2011. The aim was to realize relationship between soil and leaf nutrient elements and to provide the possibilities of formulated fertilization based on soil testing in sweet orange orchards in red soil areas. The results showed that the contents of available soil nutrient elements such as nitrogen（N），calcium（Ca），iron（Fe），magnesium（Mg）and zinc（Zn）in orchard soils could reflect， to some extent，the contents of corresponding nutrients in citrus leaves. A significant positive correlation （P < 0.05）was found between the contents of available Zn in soils and Zn contents in leaves in Anyuan county in 2010. However，the contents of soil available potassium（K），phosphorus（P），copper（Cu） and boron（B）correlated nonsignificantly with the contents of the corresponding nutrients in leaves. Therefore，formulated fertilization by soil testing is not suitable for sweet orange orchards in red soil areas. It is suggested that formulated fertilization should be mainly based on leaf diagnosis and supplemented by soil testing.