function of carbohydrates importance of carbohydrates classification of carbohydrates translocation of carbohydrates in plants carbohydrates magnesium calcium potassium phosphorus sulfer carbon hydrogen oxgen nitrogen macronutrients improvement of salt tolerance adaptive plant responses effect of salinity highly tolerant crops moderately tolerant crops salt tolerant crops sludge treatment sewage treatment polluted water treatments sewage sludge polluted water pakistan exports pakistan imports pakistan agricultral import and export pakistan agricltural product medicinal plants history traditional method of disease cure use of medicinal plants scope of ethnobotany aims and objective of ethnobotany history of ethnobotany etnobotany pharmacogenomics genetic pharmaceutical drugs soil salinity water salinity salinity
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