PJB-2018-181
EFFECT OF SALINE WATER IRRIGATION ON GROWTH AND WATER POTENTIAL OF THESPESIA POPULNEA
Zahida N. Gohar
Abstract
T. populnea is a coastal salt tolerant plant in tropical countries. Salinity tolerance was examined in T. populnea irrigated with saline water. Three lysimeters each were irrigated with non-saline water (control, ECiw: 0.4 dS.m-1) and saline water of different concentrations of sea salt, 0.5% (ECiw: 6.2 dS.m-1), 1.0% (ECiw 12.95 dS.m-1), 1.5% (ECiw: 18.9 dS.m-1) and 2.0% (ECiw: 24.76 dS.m-1). Vegetative growth was recorded in terms of plant height, number of leaves, fresh and dry biomass per plant. Water potential was recorded in plants grown at different level of sea salt concentrations. Vegetative growth decreased proportional to salinity of irrigation. Water potential of plants decreased all the way with the increase in salinity of irrigation water. An increase was observed in total sugar with increase in salinity of irrigation medium. Concentration of Na+ was increased in different plant parts with increasing salinity. The K+ concentration was not much effected at different salinity levels. In spite of proportional reduction in growth of plants under increasing salinity levels the biomass could still provide more or less sufficient amount of vegetative cover over barren saline land to improve environment
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