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Fruit Varieties Journal
(Fruit Var J)

American Pomological Society

Volume 39 Number 2 Article 11 Pages: 59-64
Year 1985 Month 4
Title: Studies on the Problem of Citrus Growing in Coastal Mud Flat
Author: Weng Maidong
Citrus trees growing in coastal mud flats must overcome difficulties brought on by the soil salinity, alkalinity and by the high level of the ground water table. 'Satsuma' mandarin (Citrus unshiu Marc.) on trifoliate orange rootstock (Poncirus trifoliata (L.) Raf.), could tolerate the soluble salt content in the soil below 0.1%, and notable injury would occur when it is over 0.2%. A ditching system could reduce the soluble salt content in the subsoil by 36.4% after a period of a 2-year rainy season, about 10 times the reduction in a nonditched grove. Ditch ing could lower the ground water table 13-24 cm. Planting green manure and turning it under are recommended in a young grove. The pH value is above 8. Therefore, chlorosis is a widespread problem mainly due to iron deficiency, associated with manganese or other minor element deficiencies. Use of 0.3-0.5 M citric acid plus ferrous sulphate solution by means of a root injection method gave prompt recovery. Trifoliate orange is the rootstock most sensitive to salinity and alkalinity. 'Goutau Cheng' (C. aurantium L.?) and 'Bendizao' mandarin (C. reticulata Blanco) are considered to be more suitable as citrus stocks in coastal mud flats at present.

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