They have further urged Queensland's new conservative Government to also abandon new income management trials in the state, joining increasing opposition from Aboriginal groups.
The income management scheme, designed to take over ailing household budgets to ensure enough money is set aside for housing, food and other essentials, was this month criticised by the Commonwealth Ombudsman.
The federal move to tackle high rates of truancy, known by the cumbersome title of Improving School Attendance through Welfare Reform Measure (Seam), was launched in the 2008-09 budget.
It aimed to "encourage" parents of children of compulsory school age to ensure enrolment and regular attendance at trial schools in the remote NT towns of Katherine, Hermanssburg, Wallace Rockhole, Wadeye and the Tiwi Islands.
Seam was also being tested in four areas of Logan - on Brisbane's southern fringe - Doomadgee in Queensland's far northwest, and Mornington Island in the Gulf of Carpenteria.
Parents receiving welfare and other income support payments must show their children are enrolled and attending school, or lose their benefits.
Payments are resumed, with back-pay, if children return to school regularly within 13 weeks. But a federal review found serious flaws in the programme.
It said parents' awareness of Seam was low - 40 per cent had not heard of it - and most of those who knew about the programme had learned of it through the media.
Parents were unclear about the programme's aims and saw it as a "big-stick" approach, less than half had thought more about the importance of their child's education since learning about Seam, and school principals did not have a clear idea of their role.
There had been improvements in school attendance but relapses into truancy were common.
Only about one-quarter of parents notified under the programme took reasonable steps to improve their child's attendance - and even this "was not always reflected in an actual improvement in attendance".
Langbroek said that extending the trial beyond the present cutoff at the end of the month would further burden state schools without gain.
"This big stick approach just basically doesn't work, and at the end of the day ends up impacting on the kids."
The state will instead focus on other measures such as school buses, providing breakfasts and before-school programmes, guidance and attendance officers, and chaplains and community liaison officers.
