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Titre :
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Effect of saline irrigation and its schedules on growth, biomass production and water use by Acacia nilotica and Dalbergia sissoo in a highly calcareous soil
|
|
Auteurs :
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P. Minhas ;
Y. Singh ;
O. Tomar ;
AL Et
|
|
Type de document :
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article/chapitre/communication
|
|
Année de publication :
|
1997
|
|
Format :
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p. 181-192
|
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Langues:
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= Anglais
|
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Catégories :
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EAU
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Mots-clés:
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INDE
;
IRRIGATION
;
CROISSANCE VEGETALE
;
BIOMASSE FORESTIERE
;
UTILISATION DE L'EAU
;
ZONE ARIDE
|
|
Résumé :
|
Afforestation programmes in arid areas suffer mainly from low rainfall, high evapo-transpirational demands, high salt content of ground-waters and impediment by kankar (calcareous) subsoil layers of root proliferation. Two of the most preferred multi-purpose tree (MPT) species, Kikar (Acacia nilotica (L.) Del.) and Shisham (Dalbergia sissoo Roxb. Ex DC) were furrow planted in August 1991 under such an environment in north-western parts of India and the effects of saline irrigation (ECw 10.5 dS m(-1), sodium adsorption ratio 20 mmol l(-1)) and various irrigation schedules were evaluated for 45 months. Saline irrigation reduced biomass by 16% in A. Nilotica compared to canal water irrigation, while the reduction was 57% in D. Sissoo. Irrigation water supplies equalling 10% of the open pan evaporation (OPE) values met water requirements during the initial 2 years after transplanting. However, trees receiving high quantities of water (20% of OPE) during the third year had improved biomass yields by 13% and 21% in D. Sissoo and A. Milotica, respectively.
|
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Source :
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Journal of arid environment, vol.36
|
