柑桔果园不断出现缺锌及缺锰的症状。在这种情况下,柑桔栽培者就应该在三月或四月进行叶面喷布锌素和锰素。(译者注——澳大利亚的三、四月相当我国的秋冬季)。在没有出现这些缺素症的地区,也应每年喷一次锌素,和每二或三年喷一次锰素。根外追肥以春季喷布为佳,也可以在秋季进行。 Citrus orchards continue to appear zinc deficiency and manganese deficiency symptoms. In this case, citrus growers should foliar Zn and Mn in March or April. (Translator’s Note - Australia’s March and April are China’s autumn and winter). In areas where these deficiencies are absent, zinc should be sprayed once a year and manganese should be sprayed every two or three years. Root top dressing to Spring Spray better, can also be carried out in the fall.