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Transpiration rates for whole plants, individual branches or tillers can be determined by techniques which measure the rate at which sap ascends stems. All of these methods use heat as a tracer for sap movement, but they are fundamentally different in their operating principles. Two methods commonly employed, the stem heat balance and trunk sector heat balance methods, use the heat balance principle; the stem is heated electrically and the heat balance is solved for the amount of heat taken updoi:10.1093/jxb/47.12.1833 fatcat:vyj2qldatrgqdkveg2xg3gpwgi