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.
ing could lower the ground water table 13-24
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.
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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