Mphamvu yokoka yokhazikika ndiyoyenera kusankha mbewu zosiyanasiyana (monga tirigu, chimanga, mpunga, balere, nyemba, manyuchi ndi mbewu zamasamba, etc.).Imatha kuchotsa njere zankhungu, mbewu zodyedwa ndi tizilombo, phala la phulusa, ndi njere.Mbewu, mbewu zophuka, mbewu zokhala ndi mankhusu, komanso zopepuka ...
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