Preliminary evaluation of the effects of environment and rootstock types on fruit quality of sweet orange cultivars in Ghana. 2, Internal quality and maturity standards

Godfrey-Sam-Aggrey, W., Department of Agronomy, Njala University College, University of Sierra Leone, Njala, Sierra Leone

Preliminary evaluation of the effects of environment and rootstock types on fruit quality of sweet orange cultivars in Ghana. 2, Internal quality and maturity standards

1973

Godfrey-Sam-Aggrey, W., Department of Agronomy, Njala University College, University of Sierra Leone, Njala, Sierra Leone

Locally-selected and imported sweet orange cultivars grown at Asuansi, Bunso and Aiyinasi-Nzima were sampled in March and September, 1966-1968, to study the effects of environment and rootstock types on the internal quality. There was no significant influence on juice quantity by stocks and sampling seasons, but orange-type and tangelo stocks produced less juice than Rough lemon. A marked enviroment-stock interaction influenced total soluble solids (TSS). Sampling seasons affected TSS in locally-selected cultivars. TSS % were generally low in all locations. There was no clear pattern as to the effect of lemon-type and orange-type stocks on acid content of orange juice. Acid content was affected by the environment, particularly soil type. Fruits low in both TSS and acid and considered insipid by European standards had been found not only on Rough lemon but also on Cleopatra mandarin, Sampson tangelo and Agege. Excepting fruits from Aiyinasi, all were of acceptable palatability to the Mrican palate. TSS % of 6'0 and acid content of 0'6 are suggested as the threshold for maturity standards. Rootstocks seemed to have some influence on the TSS/acid ratio. Vitamin C was influenced by stock-environment interaction and is quite comparable to reported values from other countries. Swedru, hitherto considered as sweet orange, was characterize as sweeet lime.

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