7HARTMAN P I, MILLS H A. The influence of nitrate on the growth of Spinach in Floradel [J]. J Am Soc Hort Sci, 1986, 111:487-490.
8SHAAHAN M M, EL-SAYED A A,ABOU EL-NOUR E A A. Predicting nitrogen, magnesium and iron nutritional status in some perennial crops using a portable chlorophyll meter [J]. Scientia Horticulturae, 1999, 82(3-4):339-348.
9NANDI A K, MAZUMDAR B C. Biochemical differences between male and female papaya (Carica papaya L.) trees in respect of total RNA and the bistone protein level [J]. Indian Biologist, 1990, 22(1) :47-50.
10GOLAN G, RIIRENA P, BIRK Y. Infloescence bud proteins of Pistacia vera [J]. Trees, 1998, 12(7):415-419.
