Choponyera chozungulira ndi chimodzi mwa zida zonyamulira zosunthika zomwe zilipo-zotha kunyamula katundu kuchokera ku matani 0.5 m'mafakitale opepuka mpaka matani 500 pazauinjiniya wolemera ndi ntchito zonyamulira kunyanja. Koma kodi mtundu wa chinthu chimodzi umatalika bwanji mochuluka chonchi? Yankho lagona pa kamangidwe ka gulaye, kuchuluka kwa ulusi wonyamula katundu, kamangidwe ka manja oteteza, ndi mfundo zoyendetsera chitetezo. Malinga ndi EN 1492-2, ma gulayeni ozungulira ayenera kukhala ndi chitetezo cha 7: 1, kutanthauza kuti gulaye yomwe idavotera tani imodzi imakhala ndi katundu wocheperako wa matani 7. Chidule chaukadaulochi chikufotokozera momwe gulayesi yozungulira imatsimikizidwira, zinthu zomwe zimakhudza malire a katundu, ndi momwe mungasankhire gulaye yoyenera pakugwiritsa ntchito kwanu.