How land preparation is done for groundnut cultivation?

Plough with tractor disc followed by harrow, once or twice with iron plough or three to four times with country plough, until all clods are broken and a good tilth is achieved. Once every three years, chisel the soils with hard pan formation at shallow depth using a chisel plough, first in one direction and then in the direction perpendicular to the previous one. In addition to chiselling, apply 12.5 t/ha FYM or composted coir pith.