[SalesForce] I am not able to pass bamboo variables in build.xml . What is missing

I have declared global variable in bamboo as

sf_username and sf_password

This is my job (ANT job in bamboo) :-

 deployCode -Dsfdc.username = ${bamboo.sf_username} -Dsfdc.password = ${bamboo.sf_password}

and this is build.xml (part where I declare deployCode)

<target name="deployCode" depends="proxy">


      <sf:deploy
        username="${sfdc.username}"
        password="${sfdc.password}"         
        serverurl="${sfdc.serverurl}"
        deployRoot="${basedir}/src"
        pollWaitMillis="${sfdc.pollWaitMillis}"
        maxPoll="${sfdc.maxPoll}"
        runAllTests="false" />
    </target>

I think , I have followed the documentation but still not able to pass global variables when I run ANT job. What is my mistake ? Any help please..

log when i echo

02-Jul-2015 11:45:24    deployCode:
02-Jul-2015 11:45:24         [echo] Performing the deploy XXXXX
02-Jul-2015 11:45:24         [echo] **${sfdc.passowrd}** and mnimbal@xxx.com.xxx