For the past hundreds of year’s trees like Dalbergia sissoo (Shisham), Acacia nilotica (Kikar), Prosopis cinneraria (Khejri) etc. have inhabited vast areas in the plains of Afghanistan, Pakistan, India, Nepal and Myanmar. These have also been widely used for afforestation in many parts of the country except in the very hot, cold and wet tracts. These have good atmospheric N2- fixing ability, therefore, are extensively planted in social and agro-forestry programmes. In order to evaluate the effect of soil salinity, present investigation was conducted on two tree species i.e. Dalbergia sissoo Roxb. ex DC (Shisham) and Acacia nilotica (L.) willd. ex Delile (Kikar) growing under field conditions in Hisar district during the year 2011-2012. In Dalbergia sissoo the mean sodium was 2.13 mg/g which was significantly lower than 9.06 mg/g obtained under saline conditions. Mean value of Sodium in Acacia nilotica also showed significant increase in non-saline over saline site trees. In Dalbergia sissoo under non saline conditions the mean potassium was 30.98 mg/g which was significantly higher than 23.73 mg/g obtained under saline environment and the mean value of potassium in Acacia nilotica also showed significant decrease in saline over non-saline site trees. Further it is obvious in Dalbergia sissoo, under non saline conditions the mean Na:K was 0.068 which was significantly lower than 0.38 obtained under the saline environment. In Acacia nilotica the mean Na:K value was 0.072 under non-saline conditions which was significantly and many fold lower than 0.44 obtained at saline sites. Under non saline conditions the mean chloride was 1.21 mg/g which was significantly lower than 5.03 mg/g obtained under saline environment in Dalbergia sissoo. The mean value of chloride in Acacia nilotica also showed significant increase in non-saline over saline site trees. Further in Dalbergia sissoo it is seen that under non saline conditions the mean Sulphate was 2.34 mg/g which was significantly lower than 7.76 mg/g obtained under saline environment sites. The mean sulphate was 2.33 mg/g under non-saline conditions which was significantly lower than 8.18 mg/g obtained at the saline sites in Acacia nilotica. Hence, the mechanism of salt tolerance is relatively better in Acacia nilotica than in Dalbergia sissoo as found from physiological and biochemical studies.

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