Chophimba cha mpweya chimatha kuchotsa zonyansa zopepuka monga fumbi, masamba, timitengo, Bokosi logwedezeka limatha kuchotsa zonyansa zazing'ono.Ndiye mphamvu yokoka tebulo akhoza kuchotsa zosafunika kuwala monga timitengo, zipolopolo, tizilombo mbewu yolumidwa.chophimba chakumbuyo chakumbuyo chimachotsanso zonyansa zazikulu ndi zazing'ono.Ndipo makinawa amatha kulekanitsa mwala ndi kukula kosiyana kwa njere / mbewu, Ichi ndi ntchito yonse yothamanga pamene woyeretsa ndi tebulo la mphamvu yokoka akugwira ntchito.