Agriculture and Livestock Development Cabinet Secretary Mithika Linturi has been ranked as the worst-performing minister.
In a report released by TIFA on Thursday, Linturi scored an E of 25 per cent.
According to findings of the poll, Linturi is considered the most responsible for the poor quality (if not "fake") of subsidized fertiliser, with more than half (53 per cent) of those respondents aware of the programme blaming him.
However, nearly one-fifth of these respondents (17 per cent) are not sure who is mostly to blame.
"Data collection was completed just before the arrest of three senior NCPB officials based on initial EACC investigations; they have now spent two nights in the cells," Tifa stated.
"It cannot be estimated how, if at all, these results would have changed had this action been taken earlier."
Before Linturi was Water CS Zacharia Njeru with a D- of 27 per cent, tying with Trade CS Rebecca Miano.
Labour CS Florence Bore scored 31 per cent while Energy CS Davis Chirchir got 33 per cent.
Several heads of the ministries scored a mean grade of D, including Gender CS Aisha Jumwa with 39 per cent, Environment CS Soipan Tuya (37 per cent), and Mining CS Salim Mvurya (37 per cent).
Others were Cooperatives CS Simon Chelugui, Tourism CS Alfred Mutua, Health CS Susan Nakhumicha and their Treasury counterpart Njuguna Ndung'u.
They all scored 36 per cent.
EAC Cabinet Secretary Peninah Malonza scored a D of 35 per cent.
The period of the Tifa polls analysis is from April 27 to April 29.
The data was collected using telephone interviews after respondents' contacts were collected face-to-face.
"The interviews were conducted in Kiswahili (mainly) and English," Tifa said
The data was collected from a sample of 2,912 respondents, with a margin of error of +/- 1.82 per cent.
