Abstract
Seven-year-old ‘Satsuma’ mandarin ( Citrus unshiu Marc. cv. ‘Shirakawa Satsuma’) trees that were budded onto trifoliate orange ( Poncirus trifoliate (L.) Raf.), ‘Flying Dragon’ trifoliate orange ( P. trifoliata Raf. var. monstrosa), or trifoliate orange rootstock with a ‘Flying Dragon’ interstock were used to determine the effects of rootstock and crop load on branch sap flow. Diurnal sap flow rates in branches were measured continuously for each diurnal period during September through December 2002. Sap flow rates differed in trees on various rootstocks and the rootstock/interstock combination as well as with the crop load applied. Diurnal sap flow rates were the highest in branches of trees budded onto trifoliate orange rootstock. Branches on trees with a ‘Flying Dragon’ interstock budded onto trifoliate orange rootstock had sap flow rates of a lower level than did branches on trees budded onto trifoliate rootstocks, whereas branches on trees budded onto ‘Flying Dragon’ rootstock had the lowest sap flow rate of all rootstock/interstock combinations. Within each rootstock/interstock treatment, trees with a heavy crop load had a lower branch sap flow rate than did trees bearing a moderate crop load. Soluble solid content in juice was demonstrated the same result as that of the sap flow rates.
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