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Treated wastewater can partly meet the requirements of water for irrigating tree crops in dry areas to better utilize, produce biomass and reduce land degradation. Seedlings of  Acacia nilotica, Azadirachta indica, Eucalyptus camaldulensis, Prosopis cineraria, P. juliflora, Tamarix aphylla, Salvadora persica ,  S. oleoides  and  Tecomella undulata  were planted and irrigated with bore-well (BW) and treated wastewater (WW) at ½ET (Evaporation-transpiration) and ¾ET. Plants irrigated at BW1/2 attained less height and collar diameter, and showed low growth increments and dry biomass. These variables increased by 1.2-2.0-fold at WW3/4 irrigation. Plants produced 1.4-fold higher biomass with WW over BW, whereas it was 1.5-fold higher at ¾ET over ½ET. Responses of species to BW/WW irrigation differed in biomass allocation to roots and other parts as a mechanism to uptake water and nutrients. Conclusively,  A. nilotica ,  A. indica ,  P. juliflora  and  T. aphylla  had stronger preference to increased irrigation level, whereas  E. camaldulensis ,  S. persica ,  S. oleoides  and  T. undulata  had preferred nutrients added through treated wastewater.  A. nilotica ,  E. camaldulensis ,  P. juliflora  and  A. indica  were best species in growth and biomass production and wastewater utilization. These can be replicated in urban afforestation to enhance bio-product and reduce degradation in environmental quality.

Utilizing treated wastewater in tree plantation in Indian desert: part I – species suitability, plant growth and biomass production