Continuous cultivation on the same piece of land with no crop residue incorporation and lack of or inadequate application of chemical fertilizer, has greatly affected soil crop productivity
Kulima mosadukiza pamalo amodzimodzi mopanda kusakaniza zinyalala za mbewu komanso kusathira kapena kusathira makwanira mankhwala a feteleza, zomwe zawononga kwambiri phindu la dothi