The married woman was allegedly gang-raped by influential men of the Allah Rakhio Mahar village.
Sehto claims that over 150,000 acres of agricultural land was destroyed due to a shortage of water.
The science has been written about extensively for at least a decade.
Three more cases of polio virus have surfaced in Khairpur with three children of the same family affected.
Around 26,000 workers in Sindh, including 1,650 from Khairpur district, have not been paid for the last five months.
Sehto began to campaign for farmers’ rights in 2004.