6Yang Xuehu,Tominaga S,Hirai T,et al. Flowering, physiological fruit drop and fruit set in Tankan (Citrus tankan Hayata) [J]. Horticultural Research (Japan) ,2009,8(1) : 81-86.
7Walter R. The Citrus Industry[M]. Revised edition. University of California, Division of AgriculturaI Science, 1999.
8Goldsehmidt E E, Aschkenazi N, Herzano Y. A role for carbohydrate levels in the control of flowering in citrus [ J ]. Seientia Horticulturae, 1985, 26 ( 2 ) : 159-166.
9Rivas F, Gravina A, Agusti M. Girdling effects on fruit set and quantum yield efficiency of PSII in two Citrus cultivars [J ]. Tree Physiology, 2007, 27 (4) : 527-535.
10Zhang W W,Fu X Z,Peng L Z,et al. Effects of sink demand and nutrient status on leaf photosynthesis of spring-cycle shoot in 'Newhall' navel orange under natural field conditions[J]. Scientia Horticulturae, 2013,150:80-85.
