红桔基砧/锦橙中间砧/纽荷尔脐橙晚实原因探讨

The late bearing of Newhall navel orange on Citrus sinensis interstock and C. tangerina rootstock

通过连续两年田间试验,比较纽荷尔脐橙高接在两个不同基砧/中间砧组合上的产量表现,并探讨其原因。结果表明,红桔/锦橙组合投产显著地晚于枳/国庆一号温州蜜柑组合(对照);其晚实原因在于:红桔/锦橙组合比对照枝条加长生长旺、加粗生长弱、枝条较直立,树冠郁闭;红桔/锦橙组合树体光合能力受抑制;红桔/锦橙组合叶片可溶性糖含量低于对照,而淀粉含量高于对照;红桔/锦橙组合叶片N、P含量比对照低,Ca含量、C/N水平比对照高。

Through two-year field experiment, a comparison of growth and yield of Newhall navel orange on two combinations of interstock and rootstock was made. The results indicated that Newhall navel orange on Citrus sinensis interstock and C. tangerina rootstock (treatment) born fruits obviously later than that on C. unshiu interstock and Poncirus trifoliate rootstock (control). The late bearing of the treatment could be attributed to that the treatment had larger length increment and less diameter increment than the control; the crown density of the treatment was larger than that of the control and the photosynthesis of it was inhibited; the content of soluble sugar in leaf was lower and the content of starch in leaf was higher than those of the control; the combination of C. sinensis interstock and C. tangerina rootstock had lower content of N and P, higher content of Ca and higher C/N value in leaf.