Manual seeding of crops into residues is relatively easy and can be done by several methods: with a hoe or pointed stick (top photo), digging of basins or zai pits (center photo), or using equipment such as the jab planter (bottom photos). The simplest of these are the hoe or pointed stick: small holes are made at the required spacing and seed placed in these, preferably with fertilizer or manure placed in another hole a few centimeters away.
CIMMYT, Manual and Animal Traction Seeding Systems in Conservation Agriculture. Harare, Zimbabwe.