Water use of Eucalyptus camaldulensin on salt affected soil at Ban Dong Bung in Yang Talad district, Kalasin province, NE Thailand   Manop Tandatemiya Jesada Luangjame and Rungruang Letsirivorakul   ABSTRACT        The heat pulse velocity (HPV) technique was used to verify the water use of Eucalyptus camaldulensis Dehnh seed lot no. 15319. This provenance was one of the fourteen provenances brought from the Australian Tree Seed Centre of the Commonwealth Scientific and Industrial Research Organization (CSIRO) in Australia. They were planted on recharge and discharge areas at Ban Dong Bung, Yang Talad District in Kalasin Province in July 1992. Trees planted on moderately and strongly saline soils on discharge area were measured on their water use in March-June 1995 which was nearly 3 years old.      The results of water use were shown that the sap flow increased with the growth of the trees. Water use was 5-27 liter/tree/day which had a breast height diameter of 4.3-6.5 cm on moderate saline soil. While it was 2.5-37.7 liter/tree/day at breast height diameter of 4.2-9.7 cm on high saline soil. Similar sizes of Eucalyptus trees exhibit their water use to be higher on strong saline than moderate saline soils.        Keywords : water use, heat pulse velocity, Eucalyptus camaldulensis, sapwood, sapflux, recharge area, discharge area