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Abstract
In Egypt improving aline ’odic ’oil i1I 011 ider d as
all important part in the agricultural ecurit program. ’aline-
’odic suils vcontajn excess oluble .slts III quantities, which
may interfere with til growtl of rna”( cop” TIley are
characterized by EC d n. ESP> 15 and pH< 8.’.
Improving such soil includ leachingof til soluble
salts lind applying proper soil amendments in order to improve
ih ir phy ical and chemical properties The kind and amount
of rhe e amendment to be used for improving ace ba red on
eversl .actors such as; physi 31 and chemical propertie of the
oil. the final required level of exchangeable odium and the
co t of unproving amendment ,
In the improving procedure of these oils, removal of
alts by leaching may increa e hydrolysis of the sodic soil
clay, con equently increase pH- Thus, the application of soil
amendment become eurial, For xample, application of
roil amendment such a gyp um, sulphur, farmyard manure
(FYM) auclilud lead [0 improving the soil properties of
saline- odic soil’. Gypsum occurs exrensively iu natural
deposits as a white coloured secondary mineral. Its chemical
form i a 04’Nli.O Tbe solnbiliry of gyp um i about 0.2
percent and i . therefore. it direct source of soluble calcium.
whichreplac exchangeablesodium,
Sulphur is yellow powder: it i not soluble in Willer and
does 110t directly upply calcium, II is oxidiz d to .ulphoric
acid by oil microorgani t11S befor it is available for reaction:
rhi amendment i- relatively low acting. Another group of
amendment is organic matrer sucb a farmyard manure which.