Performance of ‘Marsh’ Grapefruit and ‘Valencia’ Orange Trees on Eighteen Rootstocks in a Closely Spaced Planting1,2

  • William S. Castel
    University of Florida, Institute of Food and Agricultural Sciences, Agricultural Research and Education Center, P. O. Box 1088, Lake Alfred, FL 33850
  • R. L. Phillips
    University of Florida, Institute of Food and Agricultural Sciences, Department of Fruit Crops, Gainesville, FL 32611

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<jats:title>Abstract</jats:title> <jats:p>The performance of ‘Marsh’ grapefruit (<jats:italic>Citrus paradisi</jats:italic> Macf.) and ‘Valencia’ sweet orange [C. <jats:italic>sinensis</jats:italic> (L.) Osb.] on 18 rootstocks was evaluated with trees spaced 3.1 × 4.6 m and planted in 1968 in a deep, sandy soil. Rootstocks had significant effects on tree size, yield, production efficiency (kg of fruit/m<jats:sup>3</jats:sup> of canopy), fruit quality and the quantity of soluble solids/tree. The largest, most productive trees were generally those on rough lemon (C. <jats:italic>jambhiri</jats:italic> Lush.) in contrast to the smallest trees on the hybrid <jats:italic>C. sunki</jats:italic> Hort. ex Tanaka × Swingle trifoliate orange (<jats:italic>Poncirus trifoliata</jats:italic> Raf.). Rootstocks that showed promise for use in close-spaced plantings were Rubidoux trifoliate orange, Rusk citrange <jats:italic>(P. trifoliata</jats:italic> × <jats:italic>C. sinensis)</jats:italic> Koethen sweet orange × Rubidoux, Rangpur lime <jats:italic>(C. limonia</jats:italic> Osb.) × Troyer citrange, and a mandarin.</jats:p>

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