Titre :
|
Relationship between yield of grain sorghum (Sorghum bicolor) and soil salinity under field conditions
|
Auteurs :
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I. Daniells ;
J. Holland ;
R. Young ;
AL Et
|
Type de document :
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article/chapitre/communication
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Année de publication :
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2001
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Format :
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p. 211-217
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Langues:
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= Anglais
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Catégories :
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AGRONOMIE
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Mots-clés:
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SORGHO
;
SALINITE DU SOL
;
RENDEMENT
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Résumé :
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Three field experiments using grain sorghum (Sorghum bicolor), an important dryland summer crop on the Liverpool Plains in northern New South Wales, were conducted: (i) to determine the effect of dryland salinity on the yield of commercial crops at 2 sites; (ii) to see if ridging the soil would ameliorate the problem; and (iii) to compare 16 commercial varieties for tolerance to dryland salinity. Grain sorghum was shown to be more severely affected by dryland salinity than most literature would suggest. Over 3 seasons and 2 sites, sorghum yield was reduced by 50% at soil electrical conductivity (saturation extract, ECe) levels as low as 2.8 dS/m whereas advisory literature indicated a salinity threshold (no yield reduction) for sorghum of 6.8 dS/m, and 50% yield reduction at 9.9 dS/m. Current advisory literature is based on research where salinity was artificially imposed after plants were established in non-saline soil. The measurements described in this paper were on sorghum sown into saline soil. Soil and crop management strategies (ridging the soil or choosing a tolerant variety) showed limited potential for improving yields of grain sorghum on saline soil.
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Source :
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Australian Journal of Experimental Agriculture, vol.41, n°2
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