5Graham J H. Citrus myeorrhizae:Potential benefits and interactions with pathogens. HortSci, 1986, 21(6): 1302- 1306.
6Treeby MT. The role of mycorrhizal fungi and non-mycorrhizal micro - organisms in iron nutrtion of citrus. Soil Biology and Biochemist,1992, 24(9) :857-864.
7Peng S, Eissenstat DM, Graham JH et al. Growth depression in mycorrhizal citrus at high phosphorus supply. Plant Physiol, 1993,101 : 1063～1071.
